MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using...

16
MAPPING URBAN LAND USE / LAND COVER USING QUICKBIRD NDVI IMAGERY FOR RUNOFF CURVE NUMBER DETERMINATION Pravara Thanapura, Engineering Resource Center Suzette Burckhard, Civil and Environmental Engineering Mary O’ Neill, Engineering Resource Center Dwight Galster , and Mathematics and Statistics South Dakota State University, Brookings South Dakota, 57007, USA [email protected] [email protected] [email protected] [email protected] Eric Warmath Department of Transportation, State of Nevada 1263 S. Stewart Street Carson City, Nevada 89712, USA [email protected] ABSTRACT The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination. The image was collected on April 26, 2004, and provided by the City of Sioux Falls, SD. The image was radiometrically and geometrically corrected prior to this study. The imagery has four bands (including the blue, green, red, and near-infrared) and was imaged at a 2.39-meter spatial resolution. The red channel (band 3: 630-690 nm) and the near infrared channel (band 4: 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3/ Band 4 + Band3). This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication. An unsupervised spectral classification approach was used in this study. The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction. For the accuracy assessment process, a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 0.6-meter spatial resolution orthoimage acquired on April 23, 2004. The overall and individual Kappa coefficients were calculated. The overall accuracy for the two QB NDVI thematic maps produced was 95% and 73%, respectively. The average CN values of homogeneous land use / land cover and soil type covering approximately 30% of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation. The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79. INTRODUCTION Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 (Schultz, 1988). Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling, monitoring, and research (Engman 1982; 1993; Melesse and Graham 2004). Its advantages include spectral, radiometric, spatial, and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins. It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters. The primary benefits obtainable from using remote sensing are the reduction of manpower, time, and monetary resources required for data collecting and processing. For some situations, remote Pecora 16 “Global Priorities in Land Remote Sensing” October 23 – 27, 2005 * Sioux Falls, South Dakota

Transcript of MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using...

Page 1: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

MAPPING URBAN LAND USE LAND COVER USING QUICKBIRD NDVI IMAGERY FOR RUNOFF CURVE NUMBER DETERMINATION

Pravara Thanapura Engineering Resource Center

Suzette Burckhard Civil and Environmental Engineering Mary Orsquo Neill Engineering Resource Center

Dwight Galster and Mathematics and Statistics South Dakota State University Brookings

South Dakota 57007 USA pravarathanapurasdstateedusuzetteburckhardsdstateedu

maryoneillsdstateedudwightgalstersdstateedu

Eric Warmath

Department of Transportation State of Nevada

1263 S Stewart Street Carson City Nevada 89712 USA

ewarmathdotstatenvus

ABSTRACT

The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

INTRODUCTION

Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research (Engman 1982 1993 Melesse and Graham 2004) Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

sensing provides information that was previously impossible or impractical to obtain using conventional techniques (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003)

The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 (NRCS 1986) procedures and the TR-20 computer model (NRCS 1992 McCuen 2002) The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures (Ragan and Jackson 1980 Engman 1982 1993) Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it (Bondelid et al 1982 McCuen 2002)

Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

METHODS

In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

Digital Data

darr Pre-Processing

Data Merging and Integration darr

Decision and Classification darr

Image Classification Unsupervised ndash ISODATA Algorithm

darr Classification Output

darr Assess Accuracy

darr Reports and GIS Data

darr GIS Spatial Modeling

The Composite of Runoff Curve Number Calculation darr

Reject Accept Hypothesis

Figure 1 Sequence for digital processing and analysis

Study Area

The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

(a) (b)

Figure 2 The 2004 images of the study area at the same scale

(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Digital Data amp Pre-Processing The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include

orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at httpsoildatamartnrcsusdagov on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

(a) (b)

Figure 3 The registered 2004 images comparison at same scale and location (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

(b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Classification Approach With the recent development of new remote sensing systems there are an increasing number of commercially high

resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

(a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

(c) The 2004 Orthophoto (1-2-3) Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at

same scale and location in residential areas

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

Runoff Indexcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups The Composite CNrsquos Weigh Average Equation

CNcomposite = [ of area covered x CN]

Where CNcomposite is the sum of composite runoff curve number within an area of area covered is a component of the area divided by the total area CN is the runoff curve number of the area

In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect

of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 5 TR-55 runoff curve number table for urban areas

(United States Department of Agriculture 1986)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover Character of Surface

Impervious Areas If land area has lt 25 covered with areas characterized by vegetative open spaces then Impervious Areas (1) If land area gt or = 75 characterized by impervious surfaces (eg Asphalt concrete buildings etc) then Impervious Areas (1) If land area gt or = 75 covered by bare land (eg Bare rock gravel silt clay dirt and sand or any other earthen materials then Impervious Areas (1) Open Spaces Else if land area lt 25 covered with areas characterized by impervious surfaces then Open Spaces (2) If land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces (2) Else Impervious Areas (1)

Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover

Character of Surface

Open Spaces If land area = or lt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Poor condition (1) Else if land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Good to fair condition (2) Else Open Space Poor condition (1)

Sampling Design amp Accuracy Assessment

A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project The Conservative Sample Size Equation (Congalton and Green 1999)

n = B 4b2

Where n = Total samples of all classes B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes b = Significant level = +- 5 accuracy (α - 095 = 005)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters) Map Class Name

ID

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429 Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734 Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857

12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976 Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838 Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368

13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896 Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112 Overall Classification Accuracy = 9502 Overall Kappa Statistics = 09003

14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473 Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283 Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828

15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302 Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305 Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515

Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value) Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters) Map Class Name

ID Open Spaces

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547 Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445 Overall Classification Accuracy = 7316 Overall Kappa Statistics = 04498

22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701 Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939 Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456

Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value) Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value) GIS Spatial Modeling

A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process (ESRI staff 1995)

In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids (ESRI staff 1995)

In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

CNcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5) of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8) CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

Table 5 The 2004 parcel ndash activity codes and a set of rules

Activity Code and Description SCS CN Cover Type1 Rule by Area 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre Residential 18 acre (0125 acres or 50585 sqm2) gt= 40468 and lt= 50585 sqm2

11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre Residential 14 acre (025 acres or 101171 sqm2) gt 50585 and lt= 101171 sqm2

11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre Residential 13 acre (03330 acres or 134759 sqm2) gt 101171 and lt= 134759 sqm2

11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre Residential 12 acre (05 acres or 202341 sqm2) gt 134759 and lt= 202341 sqm2

11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2

11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2

31 Banks and Financial Institutions Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

33 Other offices Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

64 Warehousing Distribution Urban Districts - Industrial gt= 05 acres or 202341 sqm2

and Wholesale 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 2: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

sensing provides information that was previously impossible or impractical to obtain using conventional techniques (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003)

The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 (NRCS 1986) procedures and the TR-20 computer model (NRCS 1992 McCuen 2002) The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures (Ragan and Jackson 1980 Engman 1982 1993) Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it (Bondelid et al 1982 McCuen 2002)

Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

METHODS

In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

Digital Data

darr Pre-Processing

Data Merging and Integration darr

Decision and Classification darr

Image Classification Unsupervised ndash ISODATA Algorithm

darr Classification Output

darr Assess Accuracy

darr Reports and GIS Data

darr GIS Spatial Modeling

The Composite of Runoff Curve Number Calculation darr

Reject Accept Hypothesis

Figure 1 Sequence for digital processing and analysis

Study Area

The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

(a) (b)

Figure 2 The 2004 images of the study area at the same scale

(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Digital Data amp Pre-Processing The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include

orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at httpsoildatamartnrcsusdagov on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

(a) (b)

Figure 3 The registered 2004 images comparison at same scale and location (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

(b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Classification Approach With the recent development of new remote sensing systems there are an increasing number of commercially high

resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

(a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

(c) The 2004 Orthophoto (1-2-3) Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at

same scale and location in residential areas

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

Runoff Indexcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups The Composite CNrsquos Weigh Average Equation

CNcomposite = [ of area covered x CN]

Where CNcomposite is the sum of composite runoff curve number within an area of area covered is a component of the area divided by the total area CN is the runoff curve number of the area

In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect

of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 5 TR-55 runoff curve number table for urban areas

(United States Department of Agriculture 1986)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover Character of Surface

Impervious Areas If land area has lt 25 covered with areas characterized by vegetative open spaces then Impervious Areas (1) If land area gt or = 75 characterized by impervious surfaces (eg Asphalt concrete buildings etc) then Impervious Areas (1) If land area gt or = 75 covered by bare land (eg Bare rock gravel silt clay dirt and sand or any other earthen materials then Impervious Areas (1) Open Spaces Else if land area lt 25 covered with areas characterized by impervious surfaces then Open Spaces (2) If land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces (2) Else Impervious Areas (1)

Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover

Character of Surface

Open Spaces If land area = or lt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Poor condition (1) Else if land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Good to fair condition (2) Else Open Space Poor condition (1)

Sampling Design amp Accuracy Assessment

A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project The Conservative Sample Size Equation (Congalton and Green 1999)

n = B 4b2

Where n = Total samples of all classes B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes b = Significant level = +- 5 accuracy (α - 095 = 005)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters) Map Class Name

ID

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429 Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734 Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857

12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976 Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838 Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368

13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896 Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112 Overall Classification Accuracy = 9502 Overall Kappa Statistics = 09003

14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473 Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283 Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828

15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302 Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305 Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515

Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value) Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters) Map Class Name

ID Open Spaces

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547 Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445 Overall Classification Accuracy = 7316 Overall Kappa Statistics = 04498

22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701 Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939 Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456

Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value) Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value) GIS Spatial Modeling

A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process (ESRI staff 1995)

In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids (ESRI staff 1995)

In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

CNcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5) of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8) CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

Table 5 The 2004 parcel ndash activity codes and a set of rules

Activity Code and Description SCS CN Cover Type1 Rule by Area 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre Residential 18 acre (0125 acres or 50585 sqm2) gt= 40468 and lt= 50585 sqm2

11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre Residential 14 acre (025 acres or 101171 sqm2) gt 50585 and lt= 101171 sqm2

11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre Residential 13 acre (03330 acres or 134759 sqm2) gt 101171 and lt= 134759 sqm2

11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre Residential 12 acre (05 acres or 202341 sqm2) gt 134759 and lt= 202341 sqm2

11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2

11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2

31 Banks and Financial Institutions Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

33 Other offices Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

64 Warehousing Distribution Urban Districts - Industrial gt= 05 acres or 202341 sqm2

and Wholesale 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 3: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

Digital Data

darr Pre-Processing

Data Merging and Integration darr

Decision and Classification darr

Image Classification Unsupervised ndash ISODATA Algorithm

darr Classification Output

darr Assess Accuracy

darr Reports and GIS Data

darr GIS Spatial Modeling

The Composite of Runoff Curve Number Calculation darr

Reject Accept Hypothesis

Figure 1 Sequence for digital processing and analysis

Study Area

The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

(a) (b)

Figure 2 The 2004 images of the study area at the same scale

(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Digital Data amp Pre-Processing The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include

orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at httpsoildatamartnrcsusdagov on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

(a) (b)

Figure 3 The registered 2004 images comparison at same scale and location (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

(b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Classification Approach With the recent development of new remote sensing systems there are an increasing number of commercially high

resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

(a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

(c) The 2004 Orthophoto (1-2-3) Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at

same scale and location in residential areas

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

Runoff Indexcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups The Composite CNrsquos Weigh Average Equation

CNcomposite = [ of area covered x CN]

Where CNcomposite is the sum of composite runoff curve number within an area of area covered is a component of the area divided by the total area CN is the runoff curve number of the area

In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect

of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 5 TR-55 runoff curve number table for urban areas

(United States Department of Agriculture 1986)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover Character of Surface

Impervious Areas If land area has lt 25 covered with areas characterized by vegetative open spaces then Impervious Areas (1) If land area gt or = 75 characterized by impervious surfaces (eg Asphalt concrete buildings etc) then Impervious Areas (1) If land area gt or = 75 covered by bare land (eg Bare rock gravel silt clay dirt and sand or any other earthen materials then Impervious Areas (1) Open Spaces Else if land area lt 25 covered with areas characterized by impervious surfaces then Open Spaces (2) If land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces (2) Else Impervious Areas (1)

Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover

Character of Surface

Open Spaces If land area = or lt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Poor condition (1) Else if land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Good to fair condition (2) Else Open Space Poor condition (1)

Sampling Design amp Accuracy Assessment

A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project The Conservative Sample Size Equation (Congalton and Green 1999)

n = B 4b2

Where n = Total samples of all classes B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes b = Significant level = +- 5 accuracy (α - 095 = 005)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters) Map Class Name

ID

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429 Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734 Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857

12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976 Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838 Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368

13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896 Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112 Overall Classification Accuracy = 9502 Overall Kappa Statistics = 09003

14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473 Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283 Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828

15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302 Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305 Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515

Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value) Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters) Map Class Name

ID Open Spaces

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547 Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445 Overall Classification Accuracy = 7316 Overall Kappa Statistics = 04498

22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701 Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939 Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456

Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value) Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value) GIS Spatial Modeling

A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process (ESRI staff 1995)

In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids (ESRI staff 1995)

In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

CNcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5) of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8) CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

Table 5 The 2004 parcel ndash activity codes and a set of rules

Activity Code and Description SCS CN Cover Type1 Rule by Area 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre Residential 18 acre (0125 acres or 50585 sqm2) gt= 40468 and lt= 50585 sqm2

11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre Residential 14 acre (025 acres or 101171 sqm2) gt 50585 and lt= 101171 sqm2

11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre Residential 13 acre (03330 acres or 134759 sqm2) gt 101171 and lt= 134759 sqm2

11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre Residential 12 acre (05 acres or 202341 sqm2) gt 134759 and lt= 202341 sqm2

11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2

11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2

31 Banks and Financial Institutions Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

33 Other offices Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

64 Warehousing Distribution Urban Districts - Industrial gt= 05 acres or 202341 sqm2

and Wholesale 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 4: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Digital Data amp Pre-Processing The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include

orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at httpsoildatamartnrcsusdagov on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

(a) (b)

Figure 3 The registered 2004 images comparison at same scale and location (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

(b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Classification Approach With the recent development of new remote sensing systems there are an increasing number of commercially high

resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

(a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

(c) The 2004 Orthophoto (1-2-3) Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at

same scale and location in residential areas

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

Runoff Indexcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups The Composite CNrsquos Weigh Average Equation

CNcomposite = [ of area covered x CN]

Where CNcomposite is the sum of composite runoff curve number within an area of area covered is a component of the area divided by the total area CN is the runoff curve number of the area

In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect

of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 5 TR-55 runoff curve number table for urban areas

(United States Department of Agriculture 1986)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover Character of Surface

Impervious Areas If land area has lt 25 covered with areas characterized by vegetative open spaces then Impervious Areas (1) If land area gt or = 75 characterized by impervious surfaces (eg Asphalt concrete buildings etc) then Impervious Areas (1) If land area gt or = 75 covered by bare land (eg Bare rock gravel silt clay dirt and sand or any other earthen materials then Impervious Areas (1) Open Spaces Else if land area lt 25 covered with areas characterized by impervious surfaces then Open Spaces (2) If land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces (2) Else Impervious Areas (1)

Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover

Character of Surface

Open Spaces If land area = or lt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Poor condition (1) Else if land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Good to fair condition (2) Else Open Space Poor condition (1)

Sampling Design amp Accuracy Assessment

A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project The Conservative Sample Size Equation (Congalton and Green 1999)

n = B 4b2

Where n = Total samples of all classes B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes b = Significant level = +- 5 accuracy (α - 095 = 005)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters) Map Class Name

ID

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429 Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734 Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857

12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976 Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838 Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368

13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896 Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112 Overall Classification Accuracy = 9502 Overall Kappa Statistics = 09003

14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473 Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283 Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828

15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302 Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305 Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515

Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value) Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters) Map Class Name

ID Open Spaces

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547 Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445 Overall Classification Accuracy = 7316 Overall Kappa Statistics = 04498

22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701 Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939 Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456

Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value) Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value) GIS Spatial Modeling

A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process (ESRI staff 1995)

In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids (ESRI staff 1995)

In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

CNcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5) of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8) CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

Table 5 The 2004 parcel ndash activity codes and a set of rules

Activity Code and Description SCS CN Cover Type1 Rule by Area 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre Residential 18 acre (0125 acres or 50585 sqm2) gt= 40468 and lt= 50585 sqm2

11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre Residential 14 acre (025 acres or 101171 sqm2) gt 50585 and lt= 101171 sqm2

11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre Residential 13 acre (03330 acres or 134759 sqm2) gt 101171 and lt= 134759 sqm2

11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre Residential 12 acre (05 acres or 202341 sqm2) gt 134759 and lt= 202341 sqm2

11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2

11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2

31 Banks and Financial Institutions Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

33 Other offices Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

64 Warehousing Distribution Urban Districts - Industrial gt= 05 acres or 202341 sqm2

and Wholesale 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 5: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Classification Approach With the recent development of new remote sensing systems there are an increasing number of commercially high

resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

(a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

(c) The 2004 Orthophoto (1-2-3) Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at

same scale and location in residential areas

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

Runoff Indexcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups The Composite CNrsquos Weigh Average Equation

CNcomposite = [ of area covered x CN]

Where CNcomposite is the sum of composite runoff curve number within an area of area covered is a component of the area divided by the total area CN is the runoff curve number of the area

In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect

of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 5 TR-55 runoff curve number table for urban areas

(United States Department of Agriculture 1986)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover Character of Surface

Impervious Areas If land area has lt 25 covered with areas characterized by vegetative open spaces then Impervious Areas (1) If land area gt or = 75 characterized by impervious surfaces (eg Asphalt concrete buildings etc) then Impervious Areas (1) If land area gt or = 75 covered by bare land (eg Bare rock gravel silt clay dirt and sand or any other earthen materials then Impervious Areas (1) Open Spaces Else if land area lt 25 covered with areas characterized by impervious surfaces then Open Spaces (2) If land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces (2) Else Impervious Areas (1)

Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover

Character of Surface

Open Spaces If land area = or lt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Poor condition (1) Else if land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Good to fair condition (2) Else Open Space Poor condition (1)

Sampling Design amp Accuracy Assessment

A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project The Conservative Sample Size Equation (Congalton and Green 1999)

n = B 4b2

Where n = Total samples of all classes B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes b = Significant level = +- 5 accuracy (α - 095 = 005)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters) Map Class Name

ID

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429 Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734 Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857

12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976 Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838 Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368

13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896 Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112 Overall Classification Accuracy = 9502 Overall Kappa Statistics = 09003

14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473 Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283 Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828

15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302 Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305 Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515

Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value) Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters) Map Class Name

ID Open Spaces

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547 Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445 Overall Classification Accuracy = 7316 Overall Kappa Statistics = 04498

22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701 Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939 Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456

Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value) Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value) GIS Spatial Modeling

A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process (ESRI staff 1995)

In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids (ESRI staff 1995)

In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

CNcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5) of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8) CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

Table 5 The 2004 parcel ndash activity codes and a set of rules

Activity Code and Description SCS CN Cover Type1 Rule by Area 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre Residential 18 acre (0125 acres or 50585 sqm2) gt= 40468 and lt= 50585 sqm2

11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre Residential 14 acre (025 acres or 101171 sqm2) gt 50585 and lt= 101171 sqm2

11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre Residential 13 acre (03330 acres or 134759 sqm2) gt 101171 and lt= 134759 sqm2

11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre Residential 12 acre (05 acres or 202341 sqm2) gt 134759 and lt= 202341 sqm2

11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2

11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2

31 Banks and Financial Institutions Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

33 Other offices Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

64 Warehousing Distribution Urban Districts - Industrial gt= 05 acres or 202341 sqm2

and Wholesale 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 6: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

Runoff Indexcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups The Composite CNrsquos Weigh Average Equation

CNcomposite = [ of area covered x CN]

Where CNcomposite is the sum of composite runoff curve number within an area of area covered is a component of the area divided by the total area CN is the runoff curve number of the area

In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect

of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 5 TR-55 runoff curve number table for urban areas

(United States Department of Agriculture 1986)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover Character of Surface

Impervious Areas If land area has lt 25 covered with areas characterized by vegetative open spaces then Impervious Areas (1) If land area gt or = 75 characterized by impervious surfaces (eg Asphalt concrete buildings etc) then Impervious Areas (1) If land area gt or = 75 covered by bare land (eg Bare rock gravel silt clay dirt and sand or any other earthen materials then Impervious Areas (1) Open Spaces Else if land area lt 25 covered with areas characterized by impervious surfaces then Open Spaces (2) If land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces (2) Else Impervious Areas (1)

Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover

Character of Surface

Open Spaces If land area = or lt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Poor condition (1) Else if land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Good to fair condition (2) Else Open Space Poor condition (1)

Sampling Design amp Accuracy Assessment

A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project The Conservative Sample Size Equation (Congalton and Green 1999)

n = B 4b2

Where n = Total samples of all classes B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes b = Significant level = +- 5 accuracy (α - 095 = 005)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters) Map Class Name

ID

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429 Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734 Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857

12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976 Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838 Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368

13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896 Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112 Overall Classification Accuracy = 9502 Overall Kappa Statistics = 09003

14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473 Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283 Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828

15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302 Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305 Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515

Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value) Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters) Map Class Name

ID Open Spaces

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547 Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445 Overall Classification Accuracy = 7316 Overall Kappa Statistics = 04498

22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701 Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939 Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456

Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value) Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value) GIS Spatial Modeling

A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process (ESRI staff 1995)

In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids (ESRI staff 1995)

In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

CNcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5) of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8) CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

Table 5 The 2004 parcel ndash activity codes and a set of rules

Activity Code and Description SCS CN Cover Type1 Rule by Area 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre Residential 18 acre (0125 acres or 50585 sqm2) gt= 40468 and lt= 50585 sqm2

11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre Residential 14 acre (025 acres or 101171 sqm2) gt 50585 and lt= 101171 sqm2

11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre Residential 13 acre (03330 acres or 134759 sqm2) gt 101171 and lt= 134759 sqm2

11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre Residential 12 acre (05 acres or 202341 sqm2) gt 134759 and lt= 202341 sqm2

11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2

11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2

31 Banks and Financial Institutions Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

33 Other offices Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

64 Warehousing Distribution Urban Districts - Industrial gt= 05 acres or 202341 sqm2

and Wholesale 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 7: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Figure 5 TR-55 runoff curve number table for urban areas

(United States Department of Agriculture 1986)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover Character of Surface

Impervious Areas If land area has lt 25 covered with areas characterized by vegetative open spaces then Impervious Areas (1) If land area gt or = 75 characterized by impervious surfaces (eg Asphalt concrete buildings etc) then Impervious Areas (1) If land area gt or = 75 covered by bare land (eg Bare rock gravel silt clay dirt and sand or any other earthen materials then Impervious Areas (1) Open Spaces Else if land area lt 25 covered with areas characterized by impervious surfaces then Open Spaces (2) If land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces (2) Else Impervious Areas (1)

Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover

Character of Surface

Open Spaces If land area = or lt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Poor condition (1) Else if land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Good to fair condition (2) Else Open Space Poor condition (1)

Sampling Design amp Accuracy Assessment

A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project The Conservative Sample Size Equation (Congalton and Green 1999)

n = B 4b2

Where n = Total samples of all classes B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes b = Significant level = +- 5 accuracy (α - 095 = 005)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters) Map Class Name

ID

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429 Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734 Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857

12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976 Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838 Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368

13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896 Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112 Overall Classification Accuracy = 9502 Overall Kappa Statistics = 09003

14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473 Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283 Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828

15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302 Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305 Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515

Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value) Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters) Map Class Name

ID Open Spaces

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547 Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445 Overall Classification Accuracy = 7316 Overall Kappa Statistics = 04498

22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701 Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939 Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456

Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value) Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value) GIS Spatial Modeling

A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process (ESRI staff 1995)

In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids (ESRI staff 1995)

In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

CNcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5) of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8) CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

Table 5 The 2004 parcel ndash activity codes and a set of rules

Activity Code and Description SCS CN Cover Type1 Rule by Area 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre Residential 18 acre (0125 acres or 50585 sqm2) gt= 40468 and lt= 50585 sqm2

11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre Residential 14 acre (025 acres or 101171 sqm2) gt 50585 and lt= 101171 sqm2

11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre Residential 13 acre (03330 acres or 134759 sqm2) gt 101171 and lt= 134759 sqm2

11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre Residential 12 acre (05 acres or 202341 sqm2) gt 134759 and lt= 202341 sqm2

11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2

11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2

31 Banks and Financial Institutions Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

33 Other offices Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

64 Warehousing Distribution Urban Districts - Industrial gt= 05 acres or 202341 sqm2

and Wholesale 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 8: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover Character of Surface

Impervious Areas If land area has lt 25 covered with areas characterized by vegetative open spaces then Impervious Areas (1) If land area gt or = 75 characterized by impervious surfaces (eg Asphalt concrete buildings etc) then Impervious Areas (1) If land area gt or = 75 covered by bare land (eg Bare rock gravel silt clay dirt and sand or any other earthen materials then Impervious Areas (1) Open Spaces Else if land area lt 25 covered with areas characterized by impervious surfaces then Open Spaces (2) If land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces (2) Else Impervious Areas (1)

Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7) [copy 2005 Pravara Thanapura Use with permission]

Labels Rules

Land Use Land Cover

Character of Surface

Open Spaces If land area = or lt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Poor condition (1) Else if land area gt 75 covered with vegetation naturally existing or planted (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc) then Open Spaces - Good to fair condition (2) Else Open Space Poor condition (1)

Sampling Design amp Accuracy Assessment

A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project The Conservative Sample Size Equation (Congalton and Green 1999)

n = B 4b2

Where n = Total samples of all classes B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes b = Significant level = +- 5 accuracy (α - 095 = 005)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters) Map Class Name

ID

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429 Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734 Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857

12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976 Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838 Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368

13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896 Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112 Overall Classification Accuracy = 9502 Overall Kappa Statistics = 09003

14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473 Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283 Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828

15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302 Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305 Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515

Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value) Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters) Map Class Name

ID Open Spaces

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547 Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445 Overall Classification Accuracy = 7316 Overall Kappa Statistics = 04498

22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701 Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939 Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456

Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value) Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value) GIS Spatial Modeling

A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process (ESRI staff 1995)

In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids (ESRI staff 1995)

In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

CNcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5) of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8) CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

Table 5 The 2004 parcel ndash activity codes and a set of rules

Activity Code and Description SCS CN Cover Type1 Rule by Area 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre Residential 18 acre (0125 acres or 50585 sqm2) gt= 40468 and lt= 50585 sqm2

11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre Residential 14 acre (025 acres or 101171 sqm2) gt 50585 and lt= 101171 sqm2

11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre Residential 13 acre (03330 acres or 134759 sqm2) gt 101171 and lt= 134759 sqm2

11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre Residential 12 acre (05 acres or 202341 sqm2) gt 134759 and lt= 202341 sqm2

11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2

11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2

31 Banks and Financial Institutions Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

33 Other offices Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

64 Warehousing Distribution Urban Districts - Industrial gt= 05 acres or 202341 sqm2

and Wholesale 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 9: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters) Map Class Name

ID

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429 Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734 Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857

12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976 Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838 Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368

13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896 Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112 Overall Classification Accuracy = 9502 Overall Kappa Statistics = 09003

14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473 Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283 Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828

15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302 Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305 Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515

Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value) Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters) Map Class Name

ID Open Spaces

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547 Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445 Overall Classification Accuracy = 7316 Overall Kappa Statistics = 04498

22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701 Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939 Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456

Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value) Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value) GIS Spatial Modeling

A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process (ESRI staff 1995)

In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids (ESRI staff 1995)

In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

CNcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5) of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8) CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

Table 5 The 2004 parcel ndash activity codes and a set of rules

Activity Code and Description SCS CN Cover Type1 Rule by Area 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre Residential 18 acre (0125 acres or 50585 sqm2) gt= 40468 and lt= 50585 sqm2

11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre Residential 14 acre (025 acres or 101171 sqm2) gt 50585 and lt= 101171 sqm2

11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre Residential 13 acre (03330 acres or 134759 sqm2) gt 101171 and lt= 134759 sqm2

11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre Residential 12 acre (05 acres or 202341 sqm2) gt 134759 and lt= 202341 sqm2

11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2

11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2

31 Banks and Financial Institutions Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

33 Other offices Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

64 Warehousing Distribution Urban Districts - Industrial gt= 05 acres or 202341 sqm2

and Wholesale 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 10: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters) Map Class Name

ID

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429 Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734 Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857

12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976 Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838 Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368

13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896 Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112 Overall Classification Accuracy = 9502 Overall Kappa Statistics = 09003

14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473 Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283 Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828

15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302 Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305 Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515

Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value) Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters) Map Class Name

ID Open Spaces

Labeling

Criteria

Areas (Acres)

Areas ()

Reference Totals

Classified Totals

Number Correct

Producers Accuracy ()

Users Accuracy ()

Kappa Statistics

21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547 Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445 Overall Classification Accuracy = 7316 Overall Kappa Statistics = 04498

22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701 Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939 Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456

Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value) Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value) GIS Spatial Modeling

A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process (ESRI staff 1995)

In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids (ESRI staff 1995)

In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

CNcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5) of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8) CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

Table 5 The 2004 parcel ndash activity codes and a set of rules

Activity Code and Description SCS CN Cover Type1 Rule by Area 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre Residential 18 acre (0125 acres or 50585 sqm2) gt= 40468 and lt= 50585 sqm2

11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre Residential 14 acre (025 acres or 101171 sqm2) gt 50585 and lt= 101171 sqm2

11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre Residential 13 acre (03330 acres or 134759 sqm2) gt 101171 and lt= 134759 sqm2

11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre Residential 12 acre (05 acres or 202341 sqm2) gt 134759 and lt= 202341 sqm2

11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2

11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2

31 Banks and Financial Institutions Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

33 Other offices Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

64 Warehousing Distribution Urban Districts - Industrial gt= 05 acres or 202341 sqm2

and Wholesale 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 11: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

CNcomposite = [ of area covered (ji) x CN(j)] Where CNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5) of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8) CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

Table 5 The 2004 parcel ndash activity codes and a set of rules

Activity Code and Description SCS CN Cover Type1 Rule by Area 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre Residential 18 acre (0125 acres or 50585 sqm2) gt= 40468 and lt= 50585 sqm2

11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre Residential 14 acre (025 acres or 101171 sqm2) gt 50585 and lt= 101171 sqm2

11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre Residential 13 acre (03330 acres or 134759 sqm2) gt 101171 and lt= 134759 sqm2

11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre Residential 12 acre (05 acres or 202341 sqm2) gt 134759 and lt= 202341 sqm2

11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2

11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2

31 Banks and Financial Institutions Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

33 Other offices Urban Districts - Commercial and business gt= 05 acres or 202341 sqm2

64 Warehousing Distribution Urban Districts - Industrial gt= 05 acres or 202341 sqm2

and Wholesale 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 12: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by

NDVI QuickBird information and hydrologic soil groups

Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

Land Use Land Cover Curve numbers for

hydrologic Soil Group

Character of Surface A2 B3 C4 D5

Impervious Areas 98 98 98 98 Open Spaces - Poor Condition 68 79 86 89 Open Spaces - Good to Fair Condition1 49 69 79 84

1 CN of fair condition is use for open spaces ndash good to fair condition 1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982) 2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982) 3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982) 4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 13: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Table 8 The CN Results and SCS CN comparison

GIS Activity Code SCS CN Cover Type1 Rule Samples Total CNID and by Area Areas2 Result

Description (avg) B3 Sample Area4

1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994Residential 18 acre gt= 40468 and lt= 50585 sqm2 14386463 sqm2

(0125 acres or 50585 sqm2) 123 2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976

Residential 14 acre gt 50585 and lt= 101171 sqm2 23333993 sqm2

(025 acres 101171 sqm2) 1987 3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000

Residential 13 acre gt 101171 and lt= 134759 sqm2 40492530 sqm2

(03330 acres 134759 sqm2) 345 4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000

Residential 12 acre gt 134759 and lt= 202341 sqm2 22059243 sqm2

(05 acres 202341 sqm2) 188 5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557

Residential 1 acre (404683 sqm2) gt 202341and lt= 404683 sqm2 10562213 sqm2

09 6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000

Residential 2 acres (809365 sqm2) gt 404683 and lt= 809365 sqm2 1845352 sqm2

016 7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000

Financial and business gt= 202341 sqm2 6054050 sqm2

Institutions 052 8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000

and business gt= 202341 sqm2 25883493 sqm2

22 9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400

Distribution and gt= 202341 sqm2 8109837 sqm2

Wholesale 07 4224 89634 acres 8572 79 9881

362733112 sqm2

3089

SCS CNHydrologic Soil Group

Total

1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5] 2 The study area is 290142 acres (11742 hectares) 3The total area of hydrologic soil group B of each sample layer by parcel - activity code 4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

RESULTS amp DISCUSSION

The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 14: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

CONCLUSIONS

This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

ACKNOWLEDGEMENTS

The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 15: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

REFERENCES

Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 16: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

Pecora 16 ldquoGlobal Priorities in Land Remote Sensingrdquo October 23 ndash 27 2005 Sioux Falls South Dakota

  • ABSTRACT
  • METHODS
  • Study Area
  • Digital Data amp Pre-Processing
  • Classification Approach
    • REFERENCES
      • Mapping Urban Land Use Land Cover Using QuickBird NDVI Imagery for Runoff Curve Number Determination

        Pravara Thanapura Engineering Resource Center

        Suzette Burckhard Civil and Environmental Engineering

        Mary Orsquo Neill Engineering Resource Center

        Dwight Galster and Mathematics and Statistics

        South Dakota State University Brookings

        South Dakota 57007 USA

        pravarathanapurasdstateedu

        suzetteburckhardsdstateedu

        maryoneillsdstateedu

        dwightgalstersdstateedu

        Eric Warmath

        Department of Transportation State of Nevada

        1263 S Stewart Street

        Carson City Nevada 89712 USA

        ewarmathdotstatenvus

        ABSTRACT

        The objective of this study was to evaluate Normalized Difference Vegetation Index (NDVI) data derived from QuickBird (QB) satellite imagery to map impervious areas and open spaces for runoff curve number (CN) determination The image was collected on April 26 2004 and provided by the City of Sioux Falls SD The image was radiometrically and geometrically corrected prior to this study The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were used to create the QB NDVI dataset (Band 4 - Band3 Band 4 + Band3) This research employed the urban land cover classification scheme of the runoff curve number table in the TR-55 (NRCS 1986) publication An unsupervised spectral classification approach was used in this study The research hypothesis was that high-resolution NDVI could improve the efficiency and effectiveness of urban land cover data extraction For the accuracy assessment process a simple random sampling scheme was employed using a random number generator to select points from the classified QB NDVI imagery for comparison to the 06-meter spatial resolution orthoimage acquired on April 23 2004 The overall and individual Kappa coefficients were calculated The overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively The average CN values of homogeneous land use land cover and soil type covering approximately 30 of the study area were determined and compared to the SCS CN in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN produced from the spatial modeling was 85 and the average SCS CN was 79

        INTRODUCTION

        Remote satellite sensing application in hydrology did not start until the first launch of Earth Resources Technology Satellite (ERTS) [later renamed Landsat 1] in July of 1970 QUOTE (Schultz 1988) (Schultz 1988) Remotely sensed data is rapidly becoming an important source of information in hydrologic modeling monitoring and research QUOTE (Engman 1982 Engman 1993 Melesse and Graham 2004) (Engman 1982 1993 Melesse and Graham 2004) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_˜lsaquoEuml00010000000100000000000000tograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000F030000F5C_Procite5CPravara_Thanapura1pdt1AMelesse amp Graham 2004 8450104000700agraveagrave000000iquestH00 7140014000000010000000000000000000000100000000000000003000000000000AtildeAcircw00000000yumlyumlyumlyuml07AumlAcircwTHORNAcircAcircw0000200uumlntilde1200atildeAcircAcircw0600agraveagrave000000iquestH00 714001400000001000000000000000000000010000000000000000A000000000000ordmI_hUgraveEuml00030000000500000000000000tograve12000notW00yumlyumlyumlyuml Its advantages include spectral radiometric spatial and temporal resolutions including its ability to generate information and to provide a means of observing hydrological state variables over large areas or small complex basins It offers an alternative to conventional data collection employed in the estimation of certain hydrologic model parameters The primary benefits obtainable from using remote sensing are the reduction of manpower time and monetary resources required for data collecting and processing For some situations remote sensing provides information that was previously impossible or impractical to obtain using conventional techniques QUOTE (Thomas and McCuen 1979) (Thomas and McCuen 1979) Therefore remote sensing technology is a very important tool for successful hydrologic model analysis prediction and validation The National Resource Conservation Service (NRCS) formally the Soil Conservation Service (SCS) has developed a series of hydrologic models in water resource planning and design The SCS Curve Number (SCS-CN) method is the best-known component of the SCS hydrologic models According to Ponce and Hawkins (1996) the origins of the CN methodology can be traced back to the thousand of infiltrometer tests carried out by SCS in the late 1930s and early 1940s The intent was to develop basic data to evaluate the effects of watershed treatment and soil conservation measures on the rainfall-runoff process A major catalyst for the development and implementation of the runoff CN methodology was the passage of the Watershed Protection and Flood Prevention Act (Public Law 83-566) in August 1954 The method and its use are described in the SCS National Engineering Handbook Section 4 Hydrology (NEH-4) QUOTE (Soil Conservation Service (SCS) 1972) [NRCS 1972] The document has since been revised in 1956 64 65 71 72 85 and 1993 The CN method is well established in hydrologic engineering and environmental impact analyses Its major advantage are (1) its simplicity (2) its predictability (3) its stability (4) its reliance on only one parameter and (5) its responsiveness to major runoff-producing watershed properties (soil type land covertreatment surface condition and antecedent condition) [ QUOTE (Ponce and Hawkins 1996) Ponce and Hawkins 1996] Consequently the methodology has been widely used in numerous applications by practicing engineers and hydrologists nationally and internationally QUOTE (McCuen 1982 Ponce and Hawkins 1996 Golding 1997 McCuen 2002 McCuen and Okunola 2002 Mishra and Singh 2003 McCuen 2003) (McCuen 1982 2002 2003 Ponce and Hawkins 1996 Golding 1997 McCuen and Okunola 2002 Mishra and Singh 2003) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000012030000F5C_Procite5CPravara_Thanapura1pdt11Golding 1997 7870102000700agraveagrave0C0000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_Agrave08Ccedil00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000013030000F5C_Procite5CPravara_Thanapura1pdt19Ponce amp Hawkins 1996 7880104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00030000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000015030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2003 7900102000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100001E030000F5C_Procite5CPravara_Thanapura1pdt1AMcCuen amp Okunola 2002 7990104000600agraveagrave000000iquestH00xB1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00xB1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_deg0BIacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000$030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 1982 8050102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo1902000000000100006030000F5C_Procite5CPravara_Thanapura1pdt18Mishra amp Singh 2003 8230104000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml

        The CN is an index that represents the combined hydrologic effect of soil group land cover type agricultural land treatment class hydrologic condition and antecedent soil moisture QUOTE (McCuen 1982) (McCuen 1982) It is the best-known component of a series of SCS hydrologic models most noticeably the TR-55 QUOTE (Natural Resources Conservation Service (NRCS) 1986) (NRCS 1986) QUOTE Natural Resources Conservation Service United States Department of Agriculture 1986 822 procedures and the TR-20 computer model QUOTE (Natural Resources Conservation Service (NRCS) 1984 McCuen 2002) (NRCS 1992 McCuen 2002) QUOTE ADDIN PROCITE yuml1105lsquo19020000000001000011030000F5C_Procite5CPravara_Thanapura1pdt10McCuen 2002 7860102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_pograveEacute00050000000500000000000000umlograve12000notW00yumlyumlyumlyuml The CN calculation requires use of storm rainfall and associated streamflow data for annual floods to derive the best means of establishing run off curve numbers A CN of 100 represents a condition of zero potential retention or 100 runoff of incident precipitation

        Determination of the CN has been traditionally a time-consuming and labor-intensive procedure A basic problem exists in quantifying detailed spatial extent and distribution of various land cover classes Therefore remote sensing technology has become one of the primary methods for acquiring land cover data for providing detailed mapping information as input into the CN method (Jackson and Ragan 1977 Engman 1982 1993 Draper and Rao 1986 Schultz 1996 Dubavah et al 2000)

        In previous studies one of the main problems of using remotely sensed data for estimation of land cover is a spatial resolution issue Moderate spatial resolutions are insufficient to generate the detail necessary to utilize the published SCS land cover table used in the SCS procedures Egrave008000000010000000000200atilde120080000000500agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000500000000000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`00000080000000700agraveagrave00000005lsquo|yumlyumlyumlyumlm05lsquo|THORNAcircAcircw0000010007000000`000000800000007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw0000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010007000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw80000000600agraveagrave00000005lsquo|0000200m05lsquo|THORNAcircAcircw0000010007000000latilde1200800010006000000000000AtildeAcircw000020000000000IcircAtildeAcircw00000000yumlyumlyumlyuml07AumlAcircw8000000020000F5C_Procite5CPravara_Thanapura1pdt19Ragan amp Jackson 1980 6420104000500agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml000000000100000014000000010000000000000003000000000000002000000000019notAcircw00000000yumlyumlyumlyumlFnotAcircw000000003laquoAcircw0700agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE (Ragan and Jackson 1980 Engman 1982 Engman 1993) (Ragan and Jackson 1980 Engman 1982 1993) QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000 030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1993 8010102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml QUOTE ADDIN PROCITE yuml1105lsquo190200000000010000)030000F5C_Procite5CPravara_Thanapura1pdt10Engman 1982 8100102000600agraveagrave000000iquestH00agrave1400yumlyumlyumlyuml00000000010000001400000001000000000000000A000000000000ordmI_08Ecirc00010000000100000000000000umlograve12000notW00yumlyumlyumlyuml Engman in 1982 and 1993 suggested that one must develop a land cover table analogous that is compatible to the Landsat data Landsat may not be acceptable in small areas with certain land cover types Bondelid et al (1982) stated that special care should be exercised in analyzing small watersheds that contain heterogeneous land cover causing the largest CN errors Engineering designs utilizing the curve number are widely used but the curve number is sensitive to errors in the estimated input values used to derive it QUOTE (Bondelid et al 1982) (Bondelid et al 1982 McCuen 2002)

        Remote sensing GIS GPS and image processing technological capability have improved significantly since the previous studies Commercial high-resolution satellite imagery creates unique opportunities to address and potentially solve old problems The purpose of this applied research is to bridge remote sensing and GIS to produce scientific knowledge by designing technological methodologies for determining the composite of curve numbers in the urban hydrology for small watersheds technical release 55 (TR-55) table NRCS (1986) publication for practicing professionals in urban water resource planning The theoretical foundation is that mapping a high resolution NDVI image generated using the ISODATA algorithm is an efficient and effective information extraction approach for the composite of runoff curve number calculation

        METHODS

        In this research newly designed technological methodologies were proposed for mapping urban land use land cover using QuickBird NDVI imagery and developing GIS spatial modeling for generating the composite of curve numbers in the TR-55 table NRCS (1986) publication To achieve this goal a sequence for digital processing and analysis was proposed and implemented (Figure 1) In order to assess the utility of QB NDVI imagery and to validate the composite runoff curve number calculation using designed GIS spatial modeling various procedures and comparisons of the generated runoff coefficients were presented reviewed and validated by practicing professionals including the City Drainage Engineer and the City Geographic Information Systems manager for the City of Sioux Falls South Dakota in August 2005

        Figure 1 Sequence for digital processing and analysis

        Study Area

        The City of Sioux Falls is located in southeastern South Dakota Sioux Falls covers 40208 acres (162716 hectares) and has a population of approximately 138000 Climatologically Sioux Falls is in a continental climate with an average rainfall of 2386 inches (606 cm) and approximately 40 inches (1016 cm) of snow annually The majority of the precipitation comes in spring and summer with May and June being the months of maximum precipitation for the region The study area for this project is centered on 43O 31rsquo 18rdquo north latitude and 96O 44rsquo 42rsquorsquo west longitude in the southwestern part of the city This area encompasses 290142 acres (11742 hectares) with various land use land cover types and includes all or part of 26 hydrological urban sub-basins (Figure 2)

        image1png image2png

        (a) (b)

        Figure 2 The 2004 images of the study area at the same scale(a) The QuickBird multi image (4-3-2) on the left and (b) The QuickBird NDVI image on the right

        Digital Data amp Pre-Processing

        The 2004 remotely sensed data and vector GIS data layers were provided by the City of Sioux Falls They include orthophoto mosaics with 2 ft (06 m) and 05 ft (015 m) resolution a QuickBird satellite image with 796 ft (239 m) resolution and include data layers such as parcels city limit boundary hydrography and streets The data sets were processed and merged to combine the remotely sensed data with the GIS layers for the study area The April 23 2004 orthophoto was used as a reference to integrate all data sets into the same map projection and unit with the Universal Transverse Mercator (UTM) map projection World Geodetic System (WGS) 1984 and horizontal units in feet Software used in this project consisted of ERDAS Imagine 87 ArcMap 9 ArcView 33 and Microsoft Excel 2002

        The two digital orthophotographs were acquired on April 23 2004 and May 20 2002 respectively Both orthophotos were collected and scanned to meet the combined requirements of National Map Accuracy Standards 90 of all contours will be within frac12 contour interval and 90 of horizontal positions shall be within 130 of one inch at the specified map scale The specified horizontal map scale was 1 inch = 200 ft (609m) The flight height above terrain was 4000 ft (12192m) for a photo negative scale of 1 inch = 667 ft (2033m) Contour interval for the elevation data was 2 ft (061m) The radiometric density of the digital orthophotograph was 10 bits per channel with a geometric precision of 1 micron Both orthophotos were provided in UTM projection WGS84 datum and planar distance survey units in feet Additionally both orthophotos were subset to the study area and the 2002 orthophoto was degraded 3x3 using ERDAS Imagine 87 Overlaying of the subset orthophotos demonstrated good alignment between images Therefore an image to image registration was not required

        The QuickBird leaf-on image was collected on April 26 2004 The image was radiometrically corrected and orthorectified prior to this study with UTM projection WGS84 datum and units in meters The imagery has four bands (including the blue green red and near-infrared) and was imaged at a 239-meter spatial resolution in unsigned 16 bit data type The subset QB image was created in unsigned 8 bit data type The image was observed with no signs of atmospheric contamination The statistical spectral information showed a normal distribution with similar mean median and mode values Geometric correction was performed The subset scene was registered to the 2004 orthophoto with 31 ground control points and the RMS was 06940 pixel Figure 3 demonstrates the result The red channel (band 3 630-690 nm) and the near infrared channel (band 4 760-900 nm) were processed to create the QB NDVI image (NDVI = Band 4 - Band3 Band 4 + Band3) in unsigned 8 bit data type for the study area

        The 2004 NRCS SSURGO 124000 data set of the soil survey area (SSA) named ldquoMinnehaha County South Dakotardquo and its standard metadata files were downloaded from the Soil Data Mart at on June 7 2004 It is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey The soil layer was in a single zip file in ArcView shapefile format with a geographic coordinate system and using North American Datum (NAD) 1983 This layer was processed using ArcView 33 geoprocessing and Microsoft Excel 2002 to create a soil layer associated with hydrologic soil groups in the project coordinate system for this study area Overlaying of the soil hydro features to the subset QB image demonstrated a good fit Therefore a vector to image registration was not necessary

        image3png image4png

        (a) (b)

        Figure 3 The registered 2004 images comparison at same scale and location

        (a) The QuickBird multi image (4-3-2) on the left with the 2004 Orthoimage (1-2-3) on the right

        (b) The QuickBird NDVI image on the left with the 2004 Orthoimage (1-2-3) on the right

        Classification Approach

        With the recent development of new remote sensing systems there are an increasing number of commercially high resolution data available There is a considerable amount of previous research that has been devoted to exploring the magnitude and impact of spatial resolution on image analysis when changing scale from coarse to fine resolutions Due to the more heterogeneous spectral-radiometric characteristics within land use land cover unit portrayed in high resolution images many applications of traditional single-resolution classification approaches have not led to satisfactory results In general traditional single-resolution classification procedures such as supervised unsupervised and hybrid training approaches are inadequate for discriminating between land use land cover classes where spectralspatial features and spatial patterns vary as a function of spatial resolution Consequently there is an increasing need of researching for more efficient approaches to process and analyze these data products (Chen and Stow 2003)

        In this research the relatively simple Normalized Difference Vegetation Index (NDVI) was introduced in order to reduce heterogeneous spectral-radiometric characteristics within land use land cover surfaces portrayed in high resolution images It also was used for improving the accuracy level of details for mapping impervious surfaces and open spaces with different hydrologic conditions as used in the proposed SCS runoff curve number (CN) calculation in this study Additionally this research presented applying the principle behind NDVI using high spatial resolution QuickBird imagery based on the unique interaction differences in land use land cover surfaces with reflected or emitted electromagnetic radiation between QB Red band (630-690nm) and QB NIR band (760-900nm)

        NDVI has been shown to correlate green leaf biomass and green leaf area index Chlorophylls the primary photosynthetic pigments in green plants absorb light primarily from the red and blue portions of the spectrum while a higher proportion of infrared is reflected or scattered As a result vigorously growing healthy vegetation has low red-light reflectance and high near-infrared reflectance and hence high NDVI values Impervious surfaces (eg Asphalt concrete buildings etc) and bare land (eg bare soil rock dirt etc) have similar reflectance in the red and the near infrared so these surfaces will have values near zero NDVI is calculated using the formula (Near infrared ndash red)(Near infrared + red) This relatively simply algorithm produces output values in the range of -10 to 10

        Figure 4 shows a visual comparison of spectral correlation between QuickBird NDVI in unsigned 8 bit data type (0-255) for impervious areas and open spaces in the urban environment The impervious surfaces are the dark areas with low NDVI DNs and the brighter areas are vegetative covers with high NDVI DNs

        image5png image6png

        (a) The 2004 QuickBird NDVI (b) The QuickBird multi image (4-3-2)

        image7png

        (c) The 2004 Orthophoto (1-2-3)

        Figure 4 The registered 2004 images visual comparison of impervious areas and vegetative open spaces at same scale and location in residential areas

        This research employed the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication (Figure 5) The classification schemes defined from the TR-55 are detailed in Table 1 and Table 2 The defined classification schemes were used to generate two QB NDVI thematic maps using the ISODATA algorithm Gaussian Maximum Likelihood Classifier with ERDAS Imagine 87 assigning unsupervised spectral classes and assessing the accuracy of the maps The detailed map information from the second thematic map was then converted as a GIS input into a spatial modeling for calculating the composite of CNrsquos using the composite runoff index spatial model below

        This spatial model based on the composite of the CNrsquos equation below can be applied for calculating the runoff index for both the SCS CN method and the rational method the CN number calculated for the SCS CN method and a runoff coefficient is the ldquocrdquo value used in the rational method recommended by the American Society of Civil Engineers and the Water Pollution Control Federation

        The Composite of Runoff Indexrsquos Spatial Model (copy 2005 Pravara Thanapura Use with permission)

        Runoff Indexcomposite = ( [ of area covered (ji) x CN(j)]

        Where

        CNcomposite is the sum of the component runoff index within an area (i) delineated by description of area

        of area covered (ji) is the component (j) of the area (i) divided by the total area (i) Note that the component of the area is delineated by surface characteristics of land use land cover andor hydrologic soil group

        CN(j) is a runoff index of the component (j) of the area (i) determined by the surface characteristics andor its hydrologic soil groups

        The Composite CNrsquos Weigh Average Equation

        CNcomposite = ( [ of area covered x CN] Where CNcomposite is the sum of composite runoff curve number within an area

        of area covered is a component of the area divided by the total area

        CN is the runoff curve number of the area

        In this study the composite of CNrsquos calculation requires the combined surface characteristics and hydrologic effect of soil groups The surface characteristic was derived from the two QB NDVI thematic maps and the hydrologic soil groups were obtained from the 2004 NRCS SSURGO 124000 data set The soil information covered by hydrologic areas such as rivers or canals are not surveyed or were not available in this data set Therefore they were excluded from the decision rules Swimming pools were considered as impervious areas since these small size water features appeared spectrally impervious on the QB NDVI Additionally they retain precipitation and act as pervious surfaces during storms thus the decision rules would result in a conservative calculation of CNrsquos

        There is one heavy industrial area in the southern part of the study area This area was an oil and fuel storage facility The tanks and their associated grass covered containment areas approximately 038 of the study areas 290142 acres (11742 hectares) The tank structures themselves were impervious but they were spectrally ruled as open spaces which resulted in a conservative composite CN calculation Precipitation falling on the containment areas does not interact with the surface and groundwater since precipitation falling in these areas evaporates naturally or is pumped out and treated as wastewater

        image8png

        Figure 5 TR-55 runoff curve number table for urban areas 14001400000001000000000000000000000010000000000000000A000000000000ordmI_cedil13Eacute00030000000500000000000000tograve12000notW00yumlyumlyumlyuml QUOTE (United States Department of Agriculture 1986) (United States Department of Agriculture 1986)

        Table 1 Initial land use land cover classification scheme of QuickBird NDVI thematic map1 (Figure 6)[copy 2005 Pravara Thanapura Use with permission]

        Table 2 Secondary land use land cover classification scheme of QuickBird NDVI thematic map2 (Figure 7)

        [copy 2005 Pravara Thanapura Use with permission]

        Sampling Design amp Accuracy Assessment

        A simple random sampling method was chosen to ensure unbiased sample selection To provide a statistically sound assessment of accuracy the simplified worst-case scenario equation was used to calculate the sample sizes to insure sufficient samples for filling in an error matrix for this project

        The Conservative Sample Size Equation (Congalton and Green 1999)

        n = B 4b2

        Where

        n = Total samples of all classes

        B = The upper (αk) x 100th percentile of the Chi-Squared distribution with 1 degree of freedom (α) k = number of classes

        b = Significant level = +- 5 accuracy (α - 095 = 005)

        Over 500 sample points were generated for each thematic map using the ISODATA algorithm to insure good distribution across the study area Figure 6 and 7 show the accuracy assessment sites acquired for the entire classification of each QB NDVI thematic map To accomplish this ERDAS 87rsquos random number generator function was used to create random points from the QB NDVI thematic maps for comparison to the 2004 2 ft (06 m) and the 2002 05 ft (015 m) spatial resolution orthophotos The program automatically discarded random points not sufficiently representing relatively homogenous areas This function minimized registration errors of the image and helped to accurately interpret a true representation of each reference point on the orthophoto To assure visual interpretation consistency these reference points were individually evaluated by one team member with many years of photo interpretation experience In some cases there were conflicts due to lsquoleanrsquo in the orthophoto or mixed pixels around the edges These points were re-evaluated using the 2004 orthophoto Quality control was performed on the data set by the principal author Finally the error matrixes were generated and the overall and individual Kappa coefficients were calculated (Table 3 and 4)

        image9jpg

        Figure 6 Classification result of NDVI QuickBird thematic map 1and 502 accuracy sites

        image10jpg

        Figure 7 Classification result of NDVI QuickBird thematic map 2 and the accuracy assessment sites

        Table 3 Accuracy assessment result of NDVI QuickBird thematic map1

        Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)

        Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)

        Table 4 Accuracy assessment result of NDVI QuickBird thematic map2

        Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)

        Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI value)

        GIS Spatial Modeling

        A spatial modeling or analysis is a set of analytical procedures applied with a GIS A spatial model is a set of clearly defined analytical procedures that run on a spatial database to derive new information describing a new spatial relationship It is structured as a set of rules including a combination of logical expressions mathematical procedures and criteria built using analytical tools in GIS which are applied for the purpose of simulating the process QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In GIS there are three categories of spatial modeling functions that can be applied to geographic data objects (1) geometric models such as calculating the Euclidean distance between objects generating buffers calculating areas and perimeters and so on (2) coincidence models such as polygon overlay and (3) adjacency models (pathfinding redistricting and allocation) All three model categories support operations on geographic data objects such as points lines polygon TINS and grids QUOTE (Environmental Systems Research Institude 1995) (ESRI staff 1995)

        In this study the geometric and coincidence modeling functions in ArcView33 geoprocessing were designed in a sequence of steps to build a spatial modeling based on the composite runoff index spatial model The process of spatial modeling created a new data set (ArcView shapefile) of geographic features Each shapefile contained new polygons that described new spatial relationships of the data sets among surface characteristics of land use land cover and hydrologic soil groups including its CN

        Next is an example of applying the composite runoff index spatial model to develop spatial modeling for the composite of CNrsquos calculation within the study area Finally the CN results were compared to the TR-55 NRCS (1986) publication (Figure 5) in order to validate the utility of QB NDVI imagery as shown in Table 8

        The Composite of Runoff Indexrsquos Spatial Model for SCS CN and SCS adjusted CN (copy 2005 Pravara Thanapura Use with permission)

        CNcomposite = ( [ of area covered (ji) x CN(j)]

        WhereCNcomposite is the sum of the component CN within a parcel boundary (i) delineated by the land activity code of the City of Sioux Falls (Table 5)

        of area covered is a component (j) of the area (i) divided by the total area (i) Note that the component of the area is a subset of polygon features delineated by surface characteristics of land use land cover (GIS layer = ArcView shapefile) derived from two QB NDVI thematic maps using the ISODATA algorithm and hydrologic soil group as described previously (Figure 8)

        CN(j) is a runoff curve number (Table 6)of the component (polygon)[j] of the area (i) determined by the surface characteristics and its hydrologic soil groups

        Table 5 The 2004 parcel ndash activity codes and a set of rules

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        image11jpg

        Figure 8 The runoff index GIS data sets derived from the 2004 parcel layer by activity codes delineated by NDVI QuickBird information and hydrologic soil groups

        Table 6 Runoff curve numbers in Percentage for the CN calculation defined from the TR-55 NRCS (1986) Publication (Figure 5)

        1 CN of fair condition is use for open spaces ndash good to fair condition1 A The soil characteristics are deep sand deep loess and aggregated silts (McCuen 1982)

        2 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        3 C The soil characteristics are clay loams shallow sandy loam soils low in organic content and soils usually high in clay (McCuen 1982)

        4 B The soil characteristics are swell significantly when wet heavy plastic clays and certain saline soils (McCuen 1982)

        Table 8 The CN Results and SCS CN comparison

        image12emf

        GISActivity Code SCS CN Cover Type1RuleSamplesTotal CN

        IDand by AreaAreas2Result

        Description (avg)

        B

        3

        Sample Area

        4

        111 Single familyResidential districts by average lot size - gt= 01 and lt= 0125 acres3123555 acres8688859994

        Residential 18 acre

        gt= 40468 and lt= 50585 sqm

        2

        14386463 sqm

        2

        (0125 acres or 50585 sqm

        2

        )

        123

        211 Single familyResidential districts by average lot size - gt 0125 and lt= 025 acres32845766 acres8430759976

        Residential 14 acre

        gt 50585 and lt= 101171 sqm

        2

        23333993 sqm

        2

        (025 acres 101171 sqm

        2

        )

        1987

        311 Single familyResidential districts by average lot size - gt 025 and lt= 03330 acres35710006 acres82447210000

        Residential 13 acre

        gt 101171 and lt= 134759 sqm

        2

        40492530 sqm

        2

        (03330 acres 134759 sqm

        2

        )

        345

        411 Single familyResidential districts by average lot size - gt 03330 and lt= 05 acres1405451 acres82037010000

        Residential 12 acre

        gt 134759 and lt= 202341 sqm

        2

        22059243 sqm

        2

        (05 acres 202341 sqm

        2

        )

        188

        511 Single familyResidential districts by average lot size - gt 05 and lt= 1 acres43261 acres7684689557

        Residential 1 acre (404683 sqm

        2

        )gt 202341and lt= 404683 sqm

        2

        10562213 sqm

        2

        09

        611 Single familyResidential districts by average lot size - gt 1 and lt= 2 acres4456 acres85276510000

        Residential 2 acres (809365 sqm

        2

        )gt 404683 and lt= 809365 sqm

        2

        1845352 sqm

        2

        016

        731 Banks and Urban Districts - Commercial gt= 05 acres 171496 acres94199210000

        Financial and business

        gt= 202341 sqm

        2

        6054050 sqm

        2

        Institutions 052

        833 Other officesUrban Districts - Commercialgt= 05 acres566396 acres93219210000

        and business

        gt= 202341 sqm

        2

        25883493 sqm

        2

        22

        964 Warehousing Urban Districts - Industrialgt= 05 acres112004 acres8631889400

        Distribution and

        gt= 202341 sqm

        2

        8109837 sqm

        2

        Wholesale 07

        422489634 acres8572799881

        362733112 sqm

        2

        3089

        SCS CN

        Hydrologic Soil Group

        Total

        1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 NRCS (1986) publication [Figure 5]

        2 The study area is 290142 acres (11742 hectares)

        3The total area of hydrologic soil group B of each sample layer by parcel - activity code4 B The soil characteristics are shallow loess and sandy loam (McCuen 1982)

        RESULTS amp DISCUSSION

        The overall accuracy of the two QB NDVI thematic maps produced is presented in Table 3 and Table 4 using classification schemes from Table 1 and Table 2 respectively Figure 6 and 7 shows the two NDVI QuickBird thematic maps with the highest overall classification accuracy used as a GIS input into the Sioux Falls spatial modeling for the composite of CNs calculations

        Table 3 shows the overall accuracy results of mapping impervious areas and open spaces obtained from five different labeling criteria when the same unsupervised image of 100 spectral clusters was used The Map ID13 with the combination labeling criteria of impervious areas (DNs range between 1-50) and open spaces (DNs range between 51-100) achieved the highest overall Kappa value of 09003 with the overall classification accuracy of 9505 Comparing the accuracy results to the accuracy results obtained from other labeling criteria showed slightly differing classification accuracy improvement increasing toward the mid DNs of QB NDVI This pattern of change in classification accuracy showed the potential correlations between increasing and decreasing of the DNs and amounts of open spaces (vegetative areas) and impervious areas (non vegetative areas) [Figure 4] The DNs range from 126 to 0 indicates increasing impervious surfaces shown in shades of dark tones The DNs range from 126 to 255 indicates increasing openspaces shown in shades of light tones

        Table 4 shows the overall accuracy results of mapping two classes obtained from two different labeling criteria utilizing the same unsupervised image of 50 spectral clusters The overall Kappa value for the Map ID 21 and Map ID22 produced was only 044 and 045 respectively The results showed that the spectral classifications were not spectrally distinct among open spaces-poor and good-to-fair conditions Map ID21 was used in this study since its producer and user accuracy in percentages were similar which indicated higher map accuracy compare to Map ID22

        Comparing the overall accuracy of the two thematic maps demonstrated using the labeling pixel criteria with the DNs 5050 spectral cluster thresholds for assigning labels into two classes was the best method to use This tended to improve classification accuracy with high Kappa values and similar percentages of producer and user accuracy

        Finally the average CN values of different land use land cover descriptions covering homogeneous soil types were calculated and compared to the SCS CN The results of this comparison are shown in Table 8 in order to validate the utility of QB NDVI imagery for CN calculation The overall average CN covering approximately 30 of the study area produced was 85 and the average SCS CN was 79 Comparing CN value within GIS ID produced from different approaches demonstrated that the new design technological methodologies produced conservative CN results similar to those found in the SCS CN table

        The finer resolution imagery used in this study allows for better discrimination in land use land cover and the accuracy results validate the hypothesis of this study This is reflected in the fact that overall accuracy for the two QB NDVI thematic maps produced was 95 and 73 respectively Additionally the average CN values among the GIS ID samples described as single family showed that decreasing average lot size produced higher CN numbers or higher runoff This indicates increasing amounts of impervious areas and decreasing amounts of green vegetation as expected

        CONCLUSIONS

        This applied research demonstrated that the proposed spatial modeling utilizing the fine spatial resolution remotely sensed data and a GIS approach were successful in accurately automating and mapping land use land cover surface characteristics and determining the runoff curve number in the urban hydrology for small watersheds Therefore the hypothesis of this study was accepted Mapping fine spatial resolution QuickBird NDVI imagery generated using the traditional unsupervised classification was a more accurate simpler and efficient data extraction approach that increased speed and potentially reduces costs of both the analysis and mapping process The application of this approach could be beneficial to municipal engineers involved with designing or maintaining stormwater management systems and drainage improvement projects

        AcknowleDgements

        The author would like to thank the following employees of the City of Sioux Falls South Dakota for their contribution to the success of this research project Steve Van Aartsen GIS supervisor and his staff for all the data and information contributed for this project Jeff Dunn City Drainage Engineer for his time and the literature provided on hydrology in Sioux Falls and Sam Trebilcock Transportation Planner for his assistance and interest

        The author would also like to thank the co authors for their support input effort and specialized expertise in making this project a success Additional thanks go to Mr Kevin Dalsted Director Engineering Resource Center South Dakota State University Brookings South Dakota for the use of the hardware and software that made this research possible

        References

        Bondelid TR TJ Jackson and RH McCuen 1982 Estimating runoff curve numbers using remote sensing data Singh Vijay P editor Applied modeling in catchment hydrology Water Resources Publications Littleton Colorado 563 p

        Congalton R and K Green 1999 Assessing the Accuracy of Remotely Sensed Data Principles and Practices CRCLewis Press Boca Raton Florida 137 p

        Chen DM and D Stow 2003 Strategies for integrating information from multiple spatial resolutions into land-use land-cover classification routines Photogrammetric Engineering amp Remote Sensing 69(11)1279-1287

        Draper S E and S G Rao 1986 Runoff prediction using remote sensing imagery Water Resources Bulletin 22(6) 941-949 p

        Dubayah R O E F Wood E T Engman K P Czajkowski M Zion and Rhoads 2000 Remote Sensing in Hydrology and Water Management Remote Sensing in Hydrology and Water Management Schultz G A and ET Engman editors Springer Germany 483 p

        Engman E T 1982 Remote sensing applications in watershed modeling Applied modeling in catchment hydrology Singh Vijay P editor Water Resources Publications Littleton Colorado 563 p

        Engman E T 1993 Remote Sensing Handbook of Hydrology Maidment David R editor New York McGraw- Hill 241-2423 p

        Environmental Systems Research Institute Staff 1995 Understanding GIS Version 7 for UNIX and Open VMS John Wiley ampSons New York NY 500 p

        Golding B L 1997 Discussion Runoff Curve Number Has It Reached Maturity Journal of Hydrologic Engineering 2(3) 145-148 p

        Jackson T J and R M Ragan 1977 State-of-the-art application of Landsat data in urban hydrology International symposium on urban hydrology hydraulics and sediment control University of Kentucky Lexington Kentucky 275-285 p

        McCuen R H 1982 A guide to hydrologic analysis using SCS methods NJ Prentice-Hall Englewood Cliffs NJ 145 p

        McCuen R H 2002 Approach to confidence interval estimation for curve numbers Journal of Hydrologic Engineering 7(1) 43-48 p

        McCuen R H 2003 Discussion of Approach to Confidence Interval Estimation for Curve Numbers Journal of Hydrologic Engineering 8(4) 232-233 p

        McCuen R H and O Okunola 2002 Extension of TR-55 for Microwatersheds Journal of Hydrologic Engineering 7(4) 319-325 p

        Melesse A M and W D Graham 2004 Storm runoff prediction based on a spatially distributed travel time method utilizing remote sensing and GIS Journal of the American Water Resources Association (JAWRA) 40(4) 863-879 p

        Mishra S K and V P Singh 2003 Soil Conservation Service Curve Number (SCS-CN) methodology The Netherlands Kluwer Academic Publishers PO Box 17 3300 AA Dordrecht 536 p

        Natural Resources Conservation Service (NRCS) 1972 SCS National Engineering Handbook Section 4 Hydrology URL httpwwwinfousdagovCEDftpCEDneh630-ch10pdf US Department of Agriculture Natural Resources Conservation Service (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1986 Urban hydrology for small watersheds TR-55 Technical release 55 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr55html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Natural Resources Conservation Service (NRCS) 1992 Computer program for project formulation-hydrology Tech Release No 20 URL httpwwwwccnrcsusdagovhydrohydro-tools-models-tr20html US Department of Agriculture National Water and Climate Water (last date accessed 21 August 2005)

        Ponce V M and R H Hawkins 1996 Runoff curve number has it reached maturity Journal of Hydrologic Engineering 1(1) 11-19p

        Ragan R M and T J Jackson 1980 Runoff synthesis using Landsat and SCS model Journal of Hydraulics division Proceedings of the American Society of Civil Engineers (ASCE) 106(5) 667-678p

        Schultz G A 1988 Remote sensing in Hydrology Journal of Hydrology 100(1-3) 239-265 p

        Schultz G A 1996 Remote sensing applications to hydrology Runoff Hydrological Sciences Journal 41(4) 453-475 p

        Thomas J J and R H McCuen 1979 Accuracy of impervious area values estimated using remotely sensed data Water Resources Bulletin 27(3) 373-379 p

        image13png

        Digital Data13

        darr13

        Pre-Processing 13

        Data Merging and Integration 13

        darr13

        Decision and Classification13

        darr13

        Image Classification13

        Unsupervised ndash ISODATA Algorithm13

        darr13

        Classification Output13

        darr13

        Assess Accuracy13

        darr13

        Reports and GIS Data13

        darr13

        GIS Spatial Modeling13

        The Composite of Runoff Curve Number Calculation13

        darr13

        Reject Accept Hypothesis13

        13

        13

        Land Use Land Cover

        Curve numbers for

        hydrologic Soil Group

        Character of Surface

        A2

        B3

        C4

        D5

        Impervious Areas

        98

        98

        98

        98

        Open Spaces - Poor Condition

        68

        79

        86

        89

        Open Spaces - Good to Fair Condition1

        49

        69

        79

        84

        Activity Code and Description

        SCS CN Cover Type1

        Rule by Area

        11 Single family

        Residential districts by average lot size -

        gt= 01 and lt= 0125 acre

        Residential 18 acre (0125 acres or 50585 sqm2)

        gt= 40468 and lt= 50585 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 0125 and lt= 025 acre

        Residential 14 acre (025 acres or 101171 sqm2)

        gt 50585 and lt= 101171 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 025 and lt= 03330 acre

        Residential 13 acre (03330 acres or 134759 sqm2)

        gt 101171 and lt= 134759 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 03330 and lt= 05 acre

        Residential 12 acre (05 acres or 202341 sqm2)

        gt 134759 and lt= 202341 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 05 and lt= 1 acre

        Residential 1 acre (404683 sqm2)

        gt 202341and lt= 404683 sqm2

        11 Single family

        Residential districts by average lot size -

        gt 1 and lt= 2 acres

        Residential 2 acres (809365 sqm2)

        gt 404683 and lt= 809365 sqm2

        31 Banks and Financial Institutions

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        33 Other offices

        Urban Districts - Commercial and business

        gt= 05 acres or 202341 sqm2

        64 Warehousing Distribution

        Urban Districts - Industrial

        gt= 05 acres or 202341 sqm2

        and Wholesale

        Accuracy Assessment - Unsupervised Thematic Map2 (50 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        Open Spaces

        21

        Poor

        1-25

        73066

        2514

        242

        239

        164

        6777

        6862

        04547

        Good to Fair

        26-50

        64959

        2235

        328

        331

        253

        7713

        7644

        0445

        Overall Classification Accuracy = 7316

        Overall Kappa Statistics = 04498

        22

        Poor

        1-30

        90677

        3119

        242

        309

        197

        8140

        6375

        03701

        Good to Fair

        31-50

        47349

        1629

        328

        261

        216

        6585

        8276

        05939

        Overall Classification Accuracy = 7246

        Overall Kappa Statistics = 0456

        Accuracy Assessment - Unsupervised Thematic Map1(100 spectral clusters)

        Map

        Class Name

        Labeling Criteria

        Areas (Acres)

        Areas ()

        Reference Totals

        Classified Totals

        Number Correct

        Producers Accuracy ()

        Users Accuracy ()

        Kappa Statistics

        ID

        11

        Impervious areas

        1-40

        127098

        4372

        258

        216

        210

        8140

        9722

        09429

        Open spaces

        41-100

        163581

        5628

        244

        286

        238

        9754

        8322

        06734

        Overall Classification Accuracy = 8924

        Overall Kappa Statistics = 07857

        12

        Impervious areas

        1-45

        139227

        4790

        258

        241

        229

        8876

        9502

        08976

        Open spaces

        46-100

        151453

        5210

        244

        261

        232

        9508

        8889

        07838

        Overall Classification Accuracy = 9183

        Overall Kappa Statistics = 08368

        13

        Impervious areas

        1-50

        152654

        5252

        258

        261

        247

        9574

        9464

        08896

        Open spaces

        51-100

        138025

        4748

        244

        241

        230

        9426

        9544

        09112

        Overall Classification Accuracy = 9502

        Overall Kappa Statistics = 09003

        14

        Impervious areas

        1-55

        167757

        5771

        258

        285

        250

        9690

        8772

        07473

        Open spaces

        56-100

        122922

        4229

        244

        217

        209

        8566

        9631

        09283

        Overall Classification Accuracy = 9143

        Overall Kappa Statistics = 0828

        15

        Impervious areas

        1-60

        184209

        6337

        258

        306

        251

        9729

        8203

        06302

        Open spaces

        61-100

        106470

        3663

        244

        196

        189

        7746

        9643

        09305

        Overall Classification Accuracy = 8765

        Overall Kappa Statistics = 07515

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Open Spaces

        If land area = or lt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Poor condition (1)

        Else if land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces - Good to fair condition (2)

        Else Open Space Poor condition (1)

        Labels

        Rules

        Land Use Land Cover

        Character of Surface

        Impervious Areas

        If land area has lt 25 covered with areas characterized by

        vegetative open spaces then Impervious Areas (1)

        If land area gt or = 75 characterized by impervious surfaces

        (eg Asphalt concrete buildings etc) then Impervious Areas (1)

        If land area gt or = 75 covered by bare land (eg Bare rock

        gravel silt clay dirt and sand or any other earthen materials

        then Impervious Areas (1)

        Open Spaces

        Else if land area lt 25 covered with areas characterized by impervious surfaces

        then Open Spaces (2)

        If land area gt 75 covered with vegetation naturally existing or planted

        (eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)

        then Open Spaces (2)

        Else Impervious Areas (1)

Page 17: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Classification Scheme - Map1

Classification Scheme - Map2

Defined SCS CN Table

Defined SCS adjusted CN Table

FSD-AOI Activity Codes

FSD-AOI CN Result

Area Covered by Soil Type 1of2

Area Covered by Soil Type 2of2

Area Covered by Soil Type

Area Covered by Soil Type_origi

FSD-AOI CN Result Original

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
GIS Activity Code Rule Samples Total Total CN Adjusted
ID and by Area Areas Areas (Avg) CN
Description (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 123 8688 7025
Residential 18 acre
(0125 acres or 50585 sqm2)
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 1987 8430 5935
Residential 14 acre
(025 acres 101171 sqm2)
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 345 8244 5843
Residential 13 acre
(03330 acres 134759 sqm2)
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 188 8203 5721
Residential 12 acre
(05 acres 202341 sqm2)
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 090 7684 5600
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 016 8527 5824
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 052 9419 8351
Financial and business
Institutions
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 220 9321 8303
and business
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 070 8631 6595
Distribution and
Wholesale
Total 4224 89634 3089 8572 6577
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
GIS Activity Code Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID and A B C D
Description Impervious Open P Open GtoF
1 11 Single family Residential districts by average lot size - 5040 3259 1694 9994 003 001 001 006
Residential 18 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(0125 acres or 50585 sqm2) (CNadj=65) (CNadj=65)
2 11 Single family Residential districts by average lot size - 4087 3217 2694 9976 010 009 005 024
Residential 14 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(025 acres 101171 sqm2) (CNadj=38) (CNadj=38)
3 11 Single family Residential districts by average lot size - 3533 3193 3271 10000
Residential 13 acre (CN=98) (CN=79) (CN=69)
(03330 acres 134759 sqm2) (CNadj=30)
4 11 Single family Residential districts by average lot size - 3400 3161 3436 10000
Residential 12 acre (CN=98) (CN=79) (CN=69)
(05 acres 202341 sqm2) (CNadj=25)
5 11 Single family Residential districts by average lot size - 2614 3143 3798 9557 257 169 008 443
Residential 1 acre (404683 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 11 Single family Residential districts by average lot size - 2610 3882 1273 7774 051 1557 154 2226
Residential 2 acres (809365 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 31 Banks and Urban Districts - Commercial 7304 909 682 8903 869 144 085 1096
Financial and business (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
Institutions (CNadj=85) (CNadj=85)
8 33 Other offices Urban Districts - Commercial 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
and business (CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 64 Warehousing Urban Districts - Industrial 459 048 503 8496 1146 357 9491
Distribution and (CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
Wholesale (CNadj=72) (CNadj=72)
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
4 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B C D
Open Total Open Total Open Total Open Total
1 5040 3259 1694 9994 003 001 001 006
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=65) (CNadj=65)
2 4087 3217 2694 9976 010 009 005 024
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=38) (CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557 257 169 008 443
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 2610 3882 1273 7774 051 1557 154 2226
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 7304 909 682 8903 869 144 085 1096
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
8 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
2 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID C D
Open Total Open Total
1 003 001 001 006
(CN=98) (CN=89) (CN=84)
(CNadj=65)
2 010 009 005 024
(CN=98) (CN=89) (CN=84)
(CNadj=38)
3
4
5 257 169 008 443
(CN=98) (CN=89) (CN=84)
(CNadj=20)
6 051 1557 154 2226 051 1557 154 2226
(CN=98) (CN=89) (CN=84)
(Cnadj=12)
7 869 144 085 1096
(CN=98) (CN=89) (CN=84)
(CNadj=85)
8 543 059 020 622 290 060 090 439
(CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
9
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample areaa of hydrologic soil group by activity code in percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B
Open Total Open Total
1 5040 3259 1694 9994
(CN=98) (CN=79) (CN=69)
(CNadj=65)
2 4087 3217 2694 9976
(CN=98) (CN=79) (CN=69)
(CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557
(CN=98) (CN=79) (CN=69)
(CNadj=20)
6 2610 3882 1273 7774 2610 3882 1273 7774
(CN=98) (CN=79) (CN=69)
(Cnadj=12)
7 7304 909 682 8903
(CN=98) (CN=79) (CN=69)
(CNadj=85)
8 026 005 002 032 6454 1099 1349 8903
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69)
(CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample area of hydrologic soil group by activity code in percentage
GIS Activity Code SCS CN Cover Type1 Rule Samples Total CN SCS CN Adjusted
ID and by Area Areas2 Result Hydrologic Soil Group CN
Description (avg) (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994 7025
Residential 18 acre
123
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976 5935
Residential 14 acre
1987
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000 5843
Residential 13 acre
345
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000 5721
Residential 12 acre
188
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557 5600
09
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000 5824
016
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000 8351
Financial and business
Institutions 052
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000 8303
and business
22
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400 6595
Distribution and
Wholesale 07
Total 4224 89634 acres 8572 79 9881 6577
3089
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 Hydroloogic soil group B characteristics are shallow loess and sandy loam
4 The total area of hydrologic soil group B of each sample layer by parcel - acticity code
GIS ID Activity Code and Description Rule by Area
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre
Impervious areas of residential districts by average lot size
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres
7 31 Banks and Financial Institutions Urban Districts - Commercial and business
8 33 Other offices Urban Districts - Commercial and business
9 64 Warehousing Distribution Urban Districts - Industrial
and Wholesale
1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
Note 1 acre = 40468 sqm frac12 acre = 20234 13 acre = 13355 frac14 acre = 10117 18 acre = 5059 sq m
Table 7 Runoff curve numbers in Percentage for the adjusted CN calculations defined from the TR-55 (NRCS 1986) Publication (Figure 4)
Land Use Land Cover Curve numbers for hydrologic Soil Group
Description of Area A B C D
Impervious areas of Urban Districts
Commercial and business 85 85 85 85
Industrial 72 72 72 72
Impervious areas of residential districts by average lot size
65 65 65 65
38 38 38 38
30 30 30 30
25 25 25 25
20 20 20 20
12 12 12 12
Character of Surface A B C D
Open Spaces - Poor Condition 68 79 86 89
49 69 79 84
Note 1 ndash CN of Fair condition are use for open spaces ndash good to fair condition
Table 6 Runoff curve numbers in Percentage for the CN and adjusted CN calculations defined from the TR-55 (NRCS 1986) Publication (Figure 4)
Land Use Land Cover Curve numbers for
hydrologic Soil Group
Character of Surface A B C D
Impervious Areas 98 98 98 98
Open Spaces - Poor Condition 68 79 86 89
49 69 79 84
Note 1 ndash CN of Fair condition are use for open spaces ndash good to fair condition
Table 2 Classification Scheme for NDVI QuickBrid Thematic Map2
Labels Rules
Land Use Land Cover
Character of Surface
Open Spaces If land area = or lt 75 covered with vegetation naturally existing or planted
(eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)
Else if land area gt 75 covered with vegetation naturally existing or planted
(eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)
Labels Rules
Land Use Land Cover
Character of Surface
Impervious Areas If land area has lt 25 covered with areas characterized by
If land area gt or = 75 characterized by impervious surfaces
If land area gt or = 75 covered by bare land (eg Bare rock
gravel silt clay dirt and sand or any other earthen materials
Open Spaces Else if land area lt 25 covered with areas characterized by impervious surfaces
If land area gt 75 covered with vegetation naturally existing or planted
(eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)
Page 18: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Classification Scheme - Map2

Defined SCS CN Table

Defined SCS adjusted CN Table

FSD-AOI Activity Codes

FSD-AOI CN Result

Area Covered by Soil Type 1of2

Area Covered by Soil Type 2of2

Area Covered by Soil Type

Area Covered by Soil Type_origi

FSD-AOI CN Result Original

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
GIS Activity Code Rule Samples Total Total CN Adjusted
ID and by Area Areas Areas (Avg) CN
Description (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 123 8688 7025
Residential 18 acre
(0125 acres or 50585 sqm2)
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 1987 8430 5935
Residential 14 acre
(025 acres 101171 sqm2)
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 345 8244 5843
Residential 13 acre
(03330 acres 134759 sqm2)
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 188 8203 5721
Residential 12 acre
(05 acres 202341 sqm2)
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 090 7684 5600
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 016 8527 5824
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 052 9419 8351
Financial and business
Institutions
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 220 9321 8303
and business
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 070 8631 6595
Distribution and
Wholesale
Total 4224 89634 3089 8572 6577
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
GIS Activity Code Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID and A B C D
Description Impervious Open P Open GtoF
1 11 Single family Residential districts by average lot size - 5040 3259 1694 9994 003 001 001 006
Residential 18 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(0125 acres or 50585 sqm2) (CNadj=65) (CNadj=65)
2 11 Single family Residential districts by average lot size - 4087 3217 2694 9976 010 009 005 024
Residential 14 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(025 acres 101171 sqm2) (CNadj=38) (CNadj=38)
3 11 Single family Residential districts by average lot size - 3533 3193 3271 10000
Residential 13 acre (CN=98) (CN=79) (CN=69)
(03330 acres 134759 sqm2) (CNadj=30)
4 11 Single family Residential districts by average lot size - 3400 3161 3436 10000
Residential 12 acre (CN=98) (CN=79) (CN=69)
(05 acres 202341 sqm2) (CNadj=25)
5 11 Single family Residential districts by average lot size - 2614 3143 3798 9557 257 169 008 443
Residential 1 acre (404683 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 11 Single family Residential districts by average lot size - 2610 3882 1273 7774 051 1557 154 2226
Residential 2 acres (809365 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 31 Banks and Urban Districts - Commercial 7304 909 682 8903 869 144 085 1096
Financial and business (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
Institutions (CNadj=85) (CNadj=85)
8 33 Other offices Urban Districts - Commercial 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
and business (CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 64 Warehousing Urban Districts - Industrial 459 048 503 8496 1146 357 9491
Distribution and (CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
Wholesale (CNadj=72) (CNadj=72)
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
4 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B C D
Open Total Open Total Open Total Open Total
1 5040 3259 1694 9994 003 001 001 006
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=65) (CNadj=65)
2 4087 3217 2694 9976 010 009 005 024
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=38) (CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557 257 169 008 443
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 2610 3882 1273 7774 051 1557 154 2226
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 7304 909 682 8903 869 144 085 1096
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
8 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
2 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID C D
Open Total Open Total
1 003 001 001 006
(CN=98) (CN=89) (CN=84)
(CNadj=65)
2 010 009 005 024
(CN=98) (CN=89) (CN=84)
(CNadj=38)
3
4
5 257 169 008 443
(CN=98) (CN=89) (CN=84)
(CNadj=20)
6 051 1557 154 2226 051 1557 154 2226
(CN=98) (CN=89) (CN=84)
(Cnadj=12)
7 869 144 085 1096
(CN=98) (CN=89) (CN=84)
(CNadj=85)
8 543 059 020 622 290 060 090 439
(CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
9
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample areaa of hydrologic soil group by activity code in percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B
Open Total Open Total
1 5040 3259 1694 9994
(CN=98) (CN=79) (CN=69)
(CNadj=65)
2 4087 3217 2694 9976
(CN=98) (CN=79) (CN=69)
(CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557
(CN=98) (CN=79) (CN=69)
(CNadj=20)
6 2610 3882 1273 7774 2610 3882 1273 7774
(CN=98) (CN=79) (CN=69)
(Cnadj=12)
7 7304 909 682 8903
(CN=98) (CN=79) (CN=69)
(CNadj=85)
8 026 005 002 032 6454 1099 1349 8903
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69)
(CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample area of hydrologic soil group by activity code in percentage
GIS Activity Code SCS CN Cover Type1 Rule Samples Total CN SCS CN Adjusted
ID and by Area Areas2 Result Hydrologic Soil Group CN
Description (avg) (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994 7025
Residential 18 acre
123
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976 5935
Residential 14 acre
1987
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000 5843
Residential 13 acre
345
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000 5721
Residential 12 acre
188
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557 5600
09
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000 5824
016
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000 8351
Financial and business
Institutions 052
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000 8303
and business
22
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400 6595
Distribution and
Wholesale 07
Total 4224 89634 acres 8572 79 9881 6577
3089
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 Hydroloogic soil group B characteristics are shallow loess and sandy loam
4 The total area of hydrologic soil group B of each sample layer by parcel - acticity code
GIS ID Activity Code and Description Rule by Area
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre
Impervious areas of residential districts by average lot size
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres
7 31 Banks and Financial Institutions Urban Districts - Commercial and business
8 33 Other offices Urban Districts - Commercial and business
9 64 Warehousing Distribution Urban Districts - Industrial
and Wholesale
1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
Note 1 acre = 40468 sqm frac12 acre = 20234 13 acre = 13355 frac14 acre = 10117 18 acre = 5059 sq m
Table 7 Runoff curve numbers in Percentage for the adjusted CN calculations defined from the TR-55 (NRCS 1986) Publication (Figure 4)
Land Use Land Cover Curve numbers for hydrologic Soil Group
Description of Area A B C D
Impervious areas of Urban Districts
Commercial and business 85 85 85 85
Industrial 72 72 72 72
Impervious areas of residential districts by average lot size
65 65 65 65
38 38 38 38
30 30 30 30
25 25 25 25
20 20 20 20
12 12 12 12
Character of Surface A B C D
Open Spaces - Poor Condition 68 79 86 89
49 69 79 84
Note 1 ndash CN of Fair condition are use for open spaces ndash good to fair condition
Table 6 Runoff curve numbers in Percentage for the CN and adjusted CN calculations defined from the TR-55 (NRCS 1986) Publication (Figure 4)
Land Use Land Cover Curve numbers for
hydrologic Soil Group
Character of Surface A B C D
Impervious Areas 98 98 98 98
Open Spaces - Poor Condition 68 79 86 89
49 69 79 84
Note 1 ndash CN of Fair condition are use for open spaces ndash good to fair condition
Table 2 Classification Scheme for NDVI QuickBrid Thematic Map2
Labels Rules
Land Use Land Cover
Character of Surface
Open Spaces If land area = or lt 75 covered with vegetation naturally existing or planted
(eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)
Else if land area gt 75 covered with vegetation naturally existing or planted
(eg grass plants tree (leaf-on leaf-off) forest shrub and scrub etc)
Page 19: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Defined SCS CN Table

Defined SCS adjusted CN Table

FSD-AOI Activity Codes

FSD-AOI CN Result

Area Covered by Soil Type 1of2

Area Covered by Soil Type 2of2

Area Covered by Soil Type

Area Covered by Soil Type_origi

FSD-AOI CN Result Original

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
GIS Activity Code Rule Samples Total Total CN Adjusted
ID and by Area Areas Areas (Avg) CN
Description (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 123 8688 7025
Residential 18 acre
(0125 acres or 50585 sqm2)
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 1987 8430 5935
Residential 14 acre
(025 acres 101171 sqm2)
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 345 8244 5843
Residential 13 acre
(03330 acres 134759 sqm2)
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 188 8203 5721
Residential 12 acre
(05 acres 202341 sqm2)
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 090 7684 5600
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 016 8527 5824
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 052 9419 8351
Financial and business
Institutions
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 220 9321 8303
and business
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 070 8631 6595
Distribution and
Wholesale
Total 4224 89634 3089 8572 6577
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
GIS Activity Code Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID and A B C D
Description Impervious Open P Open GtoF
1 11 Single family Residential districts by average lot size - 5040 3259 1694 9994 003 001 001 006
Residential 18 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(0125 acres or 50585 sqm2) (CNadj=65) (CNadj=65)
2 11 Single family Residential districts by average lot size - 4087 3217 2694 9976 010 009 005 024
Residential 14 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(025 acres 101171 sqm2) (CNadj=38) (CNadj=38)
3 11 Single family Residential districts by average lot size - 3533 3193 3271 10000
Residential 13 acre (CN=98) (CN=79) (CN=69)
(03330 acres 134759 sqm2) (CNadj=30)
4 11 Single family Residential districts by average lot size - 3400 3161 3436 10000
Residential 12 acre (CN=98) (CN=79) (CN=69)
(05 acres 202341 sqm2) (CNadj=25)
5 11 Single family Residential districts by average lot size - 2614 3143 3798 9557 257 169 008 443
Residential 1 acre (404683 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 11 Single family Residential districts by average lot size - 2610 3882 1273 7774 051 1557 154 2226
Residential 2 acres (809365 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 31 Banks and Urban Districts - Commercial 7304 909 682 8903 869 144 085 1096
Financial and business (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
Institutions (CNadj=85) (CNadj=85)
8 33 Other offices Urban Districts - Commercial 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
and business (CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 64 Warehousing Urban Districts - Industrial 459 048 503 8496 1146 357 9491
Distribution and (CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
Wholesale (CNadj=72) (CNadj=72)
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
4 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B C D
Open Total Open Total Open Total Open Total
1 5040 3259 1694 9994 003 001 001 006
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=65) (CNadj=65)
2 4087 3217 2694 9976 010 009 005 024
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=38) (CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557 257 169 008 443
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 2610 3882 1273 7774 051 1557 154 2226
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 7304 909 682 8903 869 144 085 1096
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
8 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
2 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID C D
Open Total Open Total
1 003 001 001 006
(CN=98) (CN=89) (CN=84)
(CNadj=65)
2 010 009 005 024
(CN=98) (CN=89) (CN=84)
(CNadj=38)
3
4
5 257 169 008 443
(CN=98) (CN=89) (CN=84)
(CNadj=20)
6 051 1557 154 2226 051 1557 154 2226
(CN=98) (CN=89) (CN=84)
(Cnadj=12)
7 869 144 085 1096
(CN=98) (CN=89) (CN=84)
(CNadj=85)
8 543 059 020 622 290 060 090 439
(CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
9
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample areaa of hydrologic soil group by activity code in percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B
Open Total Open Total
1 5040 3259 1694 9994
(CN=98) (CN=79) (CN=69)
(CNadj=65)
2 4087 3217 2694 9976
(CN=98) (CN=79) (CN=69)
(CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557
(CN=98) (CN=79) (CN=69)
(CNadj=20)
6 2610 3882 1273 7774 2610 3882 1273 7774
(CN=98) (CN=79) (CN=69)
(Cnadj=12)
7 7304 909 682 8903
(CN=98) (CN=79) (CN=69)
(CNadj=85)
8 026 005 002 032 6454 1099 1349 8903
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69)
(CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample area of hydrologic soil group by activity code in percentage
GIS Activity Code SCS CN Cover Type1 Rule Samples Total CN SCS CN Adjusted
ID and by Area Areas2 Result Hydrologic Soil Group CN
Description (avg) (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994 7025
Residential 18 acre
123
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976 5935
Residential 14 acre
1987
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000 5843
Residential 13 acre
345
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000 5721
Residential 12 acre
188
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557 5600
09
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000 5824
016
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000 8351
Financial and business
Institutions 052
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000 8303
and business
22
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400 6595
Distribution and
Wholesale 07
Total 4224 89634 acres 8572 79 9881 6577
3089
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 Hydroloogic soil group B characteristics are shallow loess and sandy loam
4 The total area of hydrologic soil group B of each sample layer by parcel - acticity code
GIS ID Activity Code and Description Rule by Area
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre
Impervious areas of residential districts by average lot size
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres
7 31 Banks and Financial Institutions Urban Districts - Commercial and business
8 33 Other offices Urban Districts - Commercial and business
9 64 Warehousing Distribution Urban Districts - Industrial
and Wholesale
1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
Note 1 acre = 40468 sqm frac12 acre = 20234 13 acre = 13355 frac14 acre = 10117 18 acre = 5059 sq m
Table 7 Runoff curve numbers in Percentage for the adjusted CN calculations defined from the TR-55 (NRCS 1986) Publication (Figure 4)
Land Use Land Cover Curve numbers for hydrologic Soil Group
Description of Area A B C D
Impervious areas of Urban Districts
Commercial and business 85 85 85 85
Industrial 72 72 72 72
Impervious areas of residential districts by average lot size
65 65 65 65
38 38 38 38
30 30 30 30
25 25 25 25
20 20 20 20
12 12 12 12
Character of Surface A B C D
Open Spaces - Poor Condition 68 79 86 89
49 69 79 84
Note 1 ndash CN of Fair condition are use for open spaces ndash good to fair condition
Table 6 Runoff curve numbers in Percentage for the CN and adjusted CN calculations defined from the TR-55 (NRCS 1986) Publication (Figure 4)
Land Use Land Cover Curve numbers for
hydrologic Soil Group
Character of Surface A B C D
Impervious Areas 98 98 98 98
Open Spaces - Poor Condition 68 79 86 89
49 69 79 84
Note 1 ndash CN of Fair condition are use for open spaces ndash good to fair condition
Page 20: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Defined SCS adjusted CN Table

FSD-AOI Activity Codes

FSD-AOI CN Result

Area Covered by Soil Type 1of2

Area Covered by Soil Type 2of2

Area Covered by Soil Type

Area Covered by Soil Type_origi

FSD-AOI CN Result Original

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
GIS Activity Code Rule Samples Total Total CN Adjusted
ID and by Area Areas Areas (Avg) CN
Description (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 123 8688 7025
Residential 18 acre
(0125 acres or 50585 sqm2)
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 1987 8430 5935
Residential 14 acre
(025 acres 101171 sqm2)
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 345 8244 5843
Residential 13 acre
(03330 acres 134759 sqm2)
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 188 8203 5721
Residential 12 acre
(05 acres 202341 sqm2)
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 090 7684 5600
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 016 8527 5824
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 052 9419 8351
Financial and business
Institutions
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 220 9321 8303
and business
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 070 8631 6595
Distribution and
Wholesale
Total 4224 89634 3089 8572 6577
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
GIS Activity Code Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID and A B C D
Description Impervious Open P Open GtoF
1 11 Single family Residential districts by average lot size - 5040 3259 1694 9994 003 001 001 006
Residential 18 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(0125 acres or 50585 sqm2) (CNadj=65) (CNadj=65)
2 11 Single family Residential districts by average lot size - 4087 3217 2694 9976 010 009 005 024
Residential 14 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(025 acres 101171 sqm2) (CNadj=38) (CNadj=38)
3 11 Single family Residential districts by average lot size - 3533 3193 3271 10000
Residential 13 acre (CN=98) (CN=79) (CN=69)
(03330 acres 134759 sqm2) (CNadj=30)
4 11 Single family Residential districts by average lot size - 3400 3161 3436 10000
Residential 12 acre (CN=98) (CN=79) (CN=69)
(05 acres 202341 sqm2) (CNadj=25)
5 11 Single family Residential districts by average lot size - 2614 3143 3798 9557 257 169 008 443
Residential 1 acre (404683 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 11 Single family Residential districts by average lot size - 2610 3882 1273 7774 051 1557 154 2226
Residential 2 acres (809365 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 31 Banks and Urban Districts - Commercial 7304 909 682 8903 869 144 085 1096
Financial and business (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
Institutions (CNadj=85) (CNadj=85)
8 33 Other offices Urban Districts - Commercial 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
and business (CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 64 Warehousing Urban Districts - Industrial 459 048 503 8496 1146 357 9491
Distribution and (CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
Wholesale (CNadj=72) (CNadj=72)
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
4 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B C D
Open Total Open Total Open Total Open Total
1 5040 3259 1694 9994 003 001 001 006
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=65) (CNadj=65)
2 4087 3217 2694 9976 010 009 005 024
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=38) (CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557 257 169 008 443
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 2610 3882 1273 7774 051 1557 154 2226
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 7304 909 682 8903 869 144 085 1096
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
8 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
2 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID C D
Open Total Open Total
1 003 001 001 006
(CN=98) (CN=89) (CN=84)
(CNadj=65)
2 010 009 005 024
(CN=98) (CN=89) (CN=84)
(CNadj=38)
3
4
5 257 169 008 443
(CN=98) (CN=89) (CN=84)
(CNadj=20)
6 051 1557 154 2226 051 1557 154 2226
(CN=98) (CN=89) (CN=84)
(Cnadj=12)
7 869 144 085 1096
(CN=98) (CN=89) (CN=84)
(CNadj=85)
8 543 059 020 622 290 060 090 439
(CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
9
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample areaa of hydrologic soil group by activity code in percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B
Open Total Open Total
1 5040 3259 1694 9994
(CN=98) (CN=79) (CN=69)
(CNadj=65)
2 4087 3217 2694 9976
(CN=98) (CN=79) (CN=69)
(CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557
(CN=98) (CN=79) (CN=69)
(CNadj=20)
6 2610 3882 1273 7774 2610 3882 1273 7774
(CN=98) (CN=79) (CN=69)
(Cnadj=12)
7 7304 909 682 8903
(CN=98) (CN=79) (CN=69)
(CNadj=85)
8 026 005 002 032 6454 1099 1349 8903
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69)
(CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample area of hydrologic soil group by activity code in percentage
GIS Activity Code SCS CN Cover Type1 Rule Samples Total CN SCS CN Adjusted
ID and by Area Areas2 Result Hydrologic Soil Group CN
Description (avg) (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994 7025
Residential 18 acre
123
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976 5935
Residential 14 acre
1987
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000 5843
Residential 13 acre
345
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000 5721
Residential 12 acre
188
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557 5600
09
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000 5824
016
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000 8351
Financial and business
Institutions 052
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000 8303
and business
22
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400 6595
Distribution and
Wholesale 07
Total 4224 89634 acres 8572 79 9881 6577
3089
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 Hydroloogic soil group B characteristics are shallow loess and sandy loam
4 The total area of hydrologic soil group B of each sample layer by parcel - acticity code
GIS ID Activity Code and Description Rule by Area
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre
Impervious areas of residential districts by average lot size
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres
7 31 Banks and Financial Institutions Urban Districts - Commercial and business
8 33 Other offices Urban Districts - Commercial and business
9 64 Warehousing Distribution Urban Districts - Industrial
and Wholesale
1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
Note 1 acre = 40468 sqm frac12 acre = 20234 13 acre = 13355 frac14 acre = 10117 18 acre = 5059 sq m
Table 7 Runoff curve numbers in Percentage for the adjusted CN calculations defined from the TR-55 (NRCS 1986) Publication (Figure 4)
Land Use Land Cover Curve numbers for hydrologic Soil Group
Description of Area A B C D
Impervious areas of Urban Districts
Commercial and business 85 85 85 85
Industrial 72 72 72 72
Impervious areas of residential districts by average lot size
65 65 65 65
38 38 38 38
30 30 30 30
25 25 25 25
20 20 20 20
12 12 12 12
Character of Surface A B C D
Open Spaces - Poor Condition 68 79 86 89
49 69 79 84
Note 1 ndash CN of Fair condition are use for open spaces ndash good to fair condition
Page 21: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

FSD-AOI Activity Codes

FSD-AOI CN Result

Area Covered by Soil Type 1of2

Area Covered by Soil Type 2of2

Area Covered by Soil Type

Area Covered by Soil Type_origi

FSD-AOI CN Result Original

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
GIS Activity Code Rule Samples Total Total CN Adjusted
ID and by Area Areas Areas (Avg) CN
Description (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 123 8688 7025
Residential 18 acre
(0125 acres or 50585 sqm2)
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 1987 8430 5935
Residential 14 acre
(025 acres 101171 sqm2)
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 345 8244 5843
Residential 13 acre
(03330 acres 134759 sqm2)
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 188 8203 5721
Residential 12 acre
(05 acres 202341 sqm2)
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 090 7684 5600
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 016 8527 5824
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 052 9419 8351
Financial and business
Institutions
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 220 9321 8303
and business
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 070 8631 6595
Distribution and
Wholesale
Total 4224 89634 3089 8572 6577
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
GIS Activity Code Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID and A B C D
Description Impervious Open P Open GtoF
1 11 Single family Residential districts by average lot size - 5040 3259 1694 9994 003 001 001 006
Residential 18 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(0125 acres or 50585 sqm2) (CNadj=65) (CNadj=65)
2 11 Single family Residential districts by average lot size - 4087 3217 2694 9976 010 009 005 024
Residential 14 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(025 acres 101171 sqm2) (CNadj=38) (CNadj=38)
3 11 Single family Residential districts by average lot size - 3533 3193 3271 10000
Residential 13 acre (CN=98) (CN=79) (CN=69)
(03330 acres 134759 sqm2) (CNadj=30)
4 11 Single family Residential districts by average lot size - 3400 3161 3436 10000
Residential 12 acre (CN=98) (CN=79) (CN=69)
(05 acres 202341 sqm2) (CNadj=25)
5 11 Single family Residential districts by average lot size - 2614 3143 3798 9557 257 169 008 443
Residential 1 acre (404683 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 11 Single family Residential districts by average lot size - 2610 3882 1273 7774 051 1557 154 2226
Residential 2 acres (809365 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 31 Banks and Urban Districts - Commercial 7304 909 682 8903 869 144 085 1096
Financial and business (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
Institutions (CNadj=85) (CNadj=85)
8 33 Other offices Urban Districts - Commercial 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
and business (CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 64 Warehousing Urban Districts - Industrial 459 048 503 8496 1146 357 9491
Distribution and (CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
Wholesale (CNadj=72) (CNadj=72)
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
4 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B C D
Open Total Open Total Open Total Open Total
1 5040 3259 1694 9994 003 001 001 006
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=65) (CNadj=65)
2 4087 3217 2694 9976 010 009 005 024
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=38) (CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557 257 169 008 443
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 2610 3882 1273 7774 051 1557 154 2226
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 7304 909 682 8903 869 144 085 1096
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
8 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
2 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID C D
Open Total Open Total
1 003 001 001 006
(CN=98) (CN=89) (CN=84)
(CNadj=65)
2 010 009 005 024
(CN=98) (CN=89) (CN=84)
(CNadj=38)
3
4
5 257 169 008 443
(CN=98) (CN=89) (CN=84)
(CNadj=20)
6 051 1557 154 2226 051 1557 154 2226
(CN=98) (CN=89) (CN=84)
(Cnadj=12)
7 869 144 085 1096
(CN=98) (CN=89) (CN=84)
(CNadj=85)
8 543 059 020 622 290 060 090 439
(CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
9
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample areaa of hydrologic soil group by activity code in percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B
Open Total Open Total
1 5040 3259 1694 9994
(CN=98) (CN=79) (CN=69)
(CNadj=65)
2 4087 3217 2694 9976
(CN=98) (CN=79) (CN=69)
(CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557
(CN=98) (CN=79) (CN=69)
(CNadj=20)
6 2610 3882 1273 7774 2610 3882 1273 7774
(CN=98) (CN=79) (CN=69)
(Cnadj=12)
7 7304 909 682 8903
(CN=98) (CN=79) (CN=69)
(CNadj=85)
8 026 005 002 032 6454 1099 1349 8903
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69)
(CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample area of hydrologic soil group by activity code in percentage
GIS Activity Code SCS CN Cover Type1 Rule Samples Total CN SCS CN Adjusted
ID and by Area Areas2 Result Hydrologic Soil Group CN
Description (avg) (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994 7025
Residential 18 acre
123
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976 5935
Residential 14 acre
1987
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000 5843
Residential 13 acre
345
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000 5721
Residential 12 acre
188
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557 5600
09
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000 5824
016
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000 8351
Financial and business
Institutions 052
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000 8303
and business
22
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400 6595
Distribution and
Wholesale 07
Total 4224 89634 acres 8572 79 9881 6577
3089
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 Hydroloogic soil group B characteristics are shallow loess and sandy loam
4 The total area of hydrologic soil group B of each sample layer by parcel - acticity code
GIS ID Activity Code and Description Rule by Area
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acre
Impervious areas of residential districts by average lot size
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acre
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acre
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acre
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acre
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres
7 31 Banks and Financial Institutions Urban Districts - Commercial and business
8 33 Other offices Urban Districts - Commercial and business
9 64 Warehousing Distribution Urban Districts - Industrial
and Wholesale
1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
Note 1 acre = 40468 sqm frac12 acre = 20234 13 acre = 13355 frac14 acre = 10117 18 acre = 5059 sq m
Page 22: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

FSD-AOI CN Result

Area Covered by Soil Type 1of2

Area Covered by Soil Type 2of2

Area Covered by Soil Type

Area Covered by Soil Type_origi

FSD-AOI CN Result Original

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
GIS Activity Code Rule Samples Total Total CN Adjusted
ID and by Area Areas Areas (Avg) CN
Description (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 123 8688 7025
Residential 18 acre
(0125 acres or 50585 sqm2)
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 1987 8430 5935
Residential 14 acre
(025 acres 101171 sqm2)
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 345 8244 5843
Residential 13 acre
(03330 acres 134759 sqm2)
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 188 8203 5721
Residential 12 acre
(05 acres 202341 sqm2)
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 090 7684 5600
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 016 8527 5824
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 052 9419 8351
Financial and business
Institutions
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 220 9321 8303
and business
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 070 8631 6595
Distribution and
Wholesale
Total 4224 89634 3089 8572 6577
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
GIS Activity Code Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID and A B C D
Description Impervious Open P Open GtoF
1 11 Single family Residential districts by average lot size - 5040 3259 1694 9994 003 001 001 006
Residential 18 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(0125 acres or 50585 sqm2) (CNadj=65) (CNadj=65)
2 11 Single family Residential districts by average lot size - 4087 3217 2694 9976 010 009 005 024
Residential 14 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(025 acres 101171 sqm2) (CNadj=38) (CNadj=38)
3 11 Single family Residential districts by average lot size - 3533 3193 3271 10000
Residential 13 acre (CN=98) (CN=79) (CN=69)
(03330 acres 134759 sqm2) (CNadj=30)
4 11 Single family Residential districts by average lot size - 3400 3161 3436 10000
Residential 12 acre (CN=98) (CN=79) (CN=69)
(05 acres 202341 sqm2) (CNadj=25)
5 11 Single family Residential districts by average lot size - 2614 3143 3798 9557 257 169 008 443
Residential 1 acre (404683 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 11 Single family Residential districts by average lot size - 2610 3882 1273 7774 051 1557 154 2226
Residential 2 acres (809365 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 31 Banks and Urban Districts - Commercial 7304 909 682 8903 869 144 085 1096
Financial and business (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
Institutions (CNadj=85) (CNadj=85)
8 33 Other offices Urban Districts - Commercial 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
and business (CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 64 Warehousing Urban Districts - Industrial 459 048 503 8496 1146 357 9491
Distribution and (CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
Wholesale (CNadj=72) (CNadj=72)
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
4 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B C D
Open Total Open Total Open Total Open Total
1 5040 3259 1694 9994 003 001 001 006
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=65) (CNadj=65)
2 4087 3217 2694 9976 010 009 005 024
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=38) (CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557 257 169 008 443
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 2610 3882 1273 7774 051 1557 154 2226
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 7304 909 682 8903 869 144 085 1096
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
8 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
2 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID C D
Open Total Open Total
1 003 001 001 006
(CN=98) (CN=89) (CN=84)
(CNadj=65)
2 010 009 005 024
(CN=98) (CN=89) (CN=84)
(CNadj=38)
3
4
5 257 169 008 443
(CN=98) (CN=89) (CN=84)
(CNadj=20)
6 051 1557 154 2226 051 1557 154 2226
(CN=98) (CN=89) (CN=84)
(Cnadj=12)
7 869 144 085 1096
(CN=98) (CN=89) (CN=84)
(CNadj=85)
8 543 059 020 622 290 060 090 439
(CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
9
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample areaa of hydrologic soil group by activity code in percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B
Open Total Open Total
1 5040 3259 1694 9994
(CN=98) (CN=79) (CN=69)
(CNadj=65)
2 4087 3217 2694 9976
(CN=98) (CN=79) (CN=69)
(CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557
(CN=98) (CN=79) (CN=69)
(CNadj=20)
6 2610 3882 1273 7774 2610 3882 1273 7774
(CN=98) (CN=79) (CN=69)
(Cnadj=12)
7 7304 909 682 8903
(CN=98) (CN=79) (CN=69)
(CNadj=85)
8 026 005 002 032 6454 1099 1349 8903
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69)
(CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample area of hydrologic soil group by activity code in percentage
GIS Activity Code SCS CN Cover Type1 Rule Samples Total CN SCS CN Adjusted
ID and by Area Areas2 Result Hydrologic Soil Group CN
Description (avg) (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 8688 85 9994 7025
Residential 18 acre
123
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 8430 75 9976 5935
Residential 14 acre
1987
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 8244 72 10000 5843
Residential 13 acre
345
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 8203 70 10000 5721
Residential 12 acre
188
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 7684 68 9557 5600
09
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 8527 65 10000 5824
016
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 9419 92 10000 8351
Financial and business
Institutions 052
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 9321 92 10000 8303
and business
22
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 8631 88 9400 6595
Distribution and
Wholesale 07
Total 4224 89634 acres 8572 79 9881 6577
3089
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 Hydroloogic soil group B characteristics are shallow loess and sandy loam
4 The total area of hydrologic soil group B of each sample layer by parcel - acticity code
Page 23: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Area Covered by Soil Type 1of2

Area Covered by Soil Type 2of2

Area Covered by Soil Type

Area Covered by Soil Type_origi

FSD-AOI CN Result Original

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
GIS Activity Code Rule Samples Total Total CN Adjusted
ID and by Area Areas Areas (Avg) CN
Description (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 123 8688 7025
Residential 18 acre
(0125 acres or 50585 sqm2)
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 1987 8430 5935
Residential 14 acre
(025 acres 101171 sqm2)
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 345 8244 5843
Residential 13 acre
(03330 acres 134759 sqm2)
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 188 8203 5721
Residential 12 acre
(05 acres 202341 sqm2)
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 090 7684 5600
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 016 8527 5824
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 052 9419 8351
Financial and business
Institutions
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 220 9321 8303
and business
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 070 8631 6595
Distribution and
Wholesale
Total 4224 89634 3089 8572 6577
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
GIS Activity Code Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID and A B C D
Description Impervious Open P Open GtoF
1 11 Single family Residential districts by average lot size - 5040 3259 1694 9994 003 001 001 006
Residential 18 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(0125 acres or 50585 sqm2) (CNadj=65) (CNadj=65)
2 11 Single family Residential districts by average lot size - 4087 3217 2694 9976 010 009 005 024
Residential 14 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(025 acres 101171 sqm2) (CNadj=38) (CNadj=38)
3 11 Single family Residential districts by average lot size - 3533 3193 3271 10000
Residential 13 acre (CN=98) (CN=79) (CN=69)
(03330 acres 134759 sqm2) (CNadj=30)
4 11 Single family Residential districts by average lot size - 3400 3161 3436 10000
Residential 12 acre (CN=98) (CN=79) (CN=69)
(05 acres 202341 sqm2) (CNadj=25)
5 11 Single family Residential districts by average lot size - 2614 3143 3798 9557 257 169 008 443
Residential 1 acre (404683 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 11 Single family Residential districts by average lot size - 2610 3882 1273 7774 051 1557 154 2226
Residential 2 acres (809365 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 31 Banks and Urban Districts - Commercial 7304 909 682 8903 869 144 085 1096
Financial and business (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
Institutions (CNadj=85) (CNadj=85)
8 33 Other offices Urban Districts - Commercial 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
and business (CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 64 Warehousing Urban Districts - Industrial 459 048 503 8496 1146 357 9491
Distribution and (CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
Wholesale (CNadj=72) (CNadj=72)
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
4 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B C D
Open Total Open Total Open Total Open Total
1 5040 3259 1694 9994 003 001 001 006
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=65) (CNadj=65)
2 4087 3217 2694 9976 010 009 005 024
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=38) (CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557 257 169 008 443
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 2610 3882 1273 7774 051 1557 154 2226
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 7304 909 682 8903 869 144 085 1096
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
8 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
2 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID C D
Open Total Open Total
1 003 001 001 006
(CN=98) (CN=89) (CN=84)
(CNadj=65)
2 010 009 005 024
(CN=98) (CN=89) (CN=84)
(CNadj=38)
3
4
5 257 169 008 443
(CN=98) (CN=89) (CN=84)
(CNadj=20)
6 051 1557 154 2226 051 1557 154 2226
(CN=98) (CN=89) (CN=84)
(Cnadj=12)
7 869 144 085 1096
(CN=98) (CN=89) (CN=84)
(CNadj=85)
8 543 059 020 622 290 060 090 439
(CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
9
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample areaa of hydrologic soil group by activity code in percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B
Open Total Open Total
1 5040 3259 1694 9994
(CN=98) (CN=79) (CN=69)
(CNadj=65)
2 4087 3217 2694 9976
(CN=98) (CN=79) (CN=69)
(CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557
(CN=98) (CN=79) (CN=69)
(CNadj=20)
6 2610 3882 1273 7774 2610 3882 1273 7774
(CN=98) (CN=79) (CN=69)
(Cnadj=12)
7 7304 909 682 8903
(CN=98) (CN=79) (CN=69)
(CNadj=85)
8 026 005 002 032 6454 1099 1349 8903
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69)
(CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample area of hydrologic soil group by activity code in percentage
Page 24: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Area Covered by Soil Type 2of2

Area Covered by Soil Type

Area Covered by Soil Type_origi

FSD-AOI CN Result Original

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
GIS Activity Code Rule Samples Total Total CN Adjusted
ID and by Area Areas Areas (Avg) CN
Description (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 123 8688 7025
Residential 18 acre
(0125 acres or 50585 sqm2)
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 1987 8430 5935
Residential 14 acre
(025 acres 101171 sqm2)
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 345 8244 5843
Residential 13 acre
(03330 acres 134759 sqm2)
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 188 8203 5721
Residential 12 acre
(05 acres 202341 sqm2)
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 090 7684 5600
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 016 8527 5824
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 052 9419 8351
Financial and business
Institutions
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 220 9321 8303
and business
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 070 8631 6595
Distribution and
Wholesale
Total 4224 89634 3089 8572 6577
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
GIS Activity Code Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID and A B C D
Description Impervious Open P Open GtoF
1 11 Single family Residential districts by average lot size - 5040 3259 1694 9994 003 001 001 006
Residential 18 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(0125 acres or 50585 sqm2) (CNadj=65) (CNadj=65)
2 11 Single family Residential districts by average lot size - 4087 3217 2694 9976 010 009 005 024
Residential 14 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(025 acres 101171 sqm2) (CNadj=38) (CNadj=38)
3 11 Single family Residential districts by average lot size - 3533 3193 3271 10000
Residential 13 acre (CN=98) (CN=79) (CN=69)
(03330 acres 134759 sqm2) (CNadj=30)
4 11 Single family Residential districts by average lot size - 3400 3161 3436 10000
Residential 12 acre (CN=98) (CN=79) (CN=69)
(05 acres 202341 sqm2) (CNadj=25)
5 11 Single family Residential districts by average lot size - 2614 3143 3798 9557 257 169 008 443
Residential 1 acre (404683 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 11 Single family Residential districts by average lot size - 2610 3882 1273 7774 051 1557 154 2226
Residential 2 acres (809365 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 31 Banks and Urban Districts - Commercial 7304 909 682 8903 869 144 085 1096
Financial and business (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
Institutions (CNadj=85) (CNadj=85)
8 33 Other offices Urban Districts - Commercial 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
and business (CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 64 Warehousing Urban Districts - Industrial 459 048 503 8496 1146 357 9491
Distribution and (CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
Wholesale (CNadj=72) (CNadj=72)
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
4 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B C D
Open Total Open Total Open Total Open Total
1 5040 3259 1694 9994 003 001 001 006
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=65) (CNadj=65)
2 4087 3217 2694 9976 010 009 005 024
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=38) (CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557 257 169 008 443
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 2610 3882 1273 7774 051 1557 154 2226
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 7304 909 682 8903 869 144 085 1096
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
8 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
2 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID C D
Open Total Open Total
1 003 001 001 006
(CN=98) (CN=89) (CN=84)
(CNadj=65)
2 010 009 005 024
(CN=98) (CN=89) (CN=84)
(CNadj=38)
3
4
5 257 169 008 443
(CN=98) (CN=89) (CN=84)
(CNadj=20)
6 051 1557 154 2226 051 1557 154 2226
(CN=98) (CN=89) (CN=84)
(Cnadj=12)
7 869 144 085 1096
(CN=98) (CN=89) (CN=84)
(CNadj=85)
8 543 059 020 622 290 060 090 439
(CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
9
Note 1 is Total sample area of hydrologic soil group by character of surface and hydrologic condition by activity code in percentage
2 is Total sample areaa of hydrologic soil group by activity code in percentage
Page 25: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Area Covered by Soil Type

Area Covered by Soil Type_origi

FSD-AOI CN Result Original

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
GIS Activity Code Rule Samples Total Total CN Adjusted
ID and by Area Areas Areas (Avg) CN
Description (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 123 8688 7025
Residential 18 acre
(0125 acres or 50585 sqm2)
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 1987 8430 5935
Residential 14 acre
(025 acres 101171 sqm2)
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 345 8244 5843
Residential 13 acre
(03330 acres 134759 sqm2)
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 188 8203 5721
Residential 12 acre
(05 acres 202341 sqm2)
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 090 7684 5600
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 016 8527 5824
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 052 9419 8351
Financial and business
Institutions
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 220 9321 8303
and business
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 070 8631 6595
Distribution and
Wholesale
Total 4224 89634 3089 8572 6577
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
GIS Activity Code Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID and A B C D
Description Impervious Open P Open GtoF
1 11 Single family Residential districts by average lot size - 5040 3259 1694 9994 003 001 001 006
Residential 18 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(0125 acres or 50585 sqm2) (CNadj=65) (CNadj=65)
2 11 Single family Residential districts by average lot size - 4087 3217 2694 9976 010 009 005 024
Residential 14 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(025 acres 101171 sqm2) (CNadj=38) (CNadj=38)
3 11 Single family Residential districts by average lot size - 3533 3193 3271 10000
Residential 13 acre (CN=98) (CN=79) (CN=69)
(03330 acres 134759 sqm2) (CNadj=30)
4 11 Single family Residential districts by average lot size - 3400 3161 3436 10000
Residential 12 acre (CN=98) (CN=79) (CN=69)
(05 acres 202341 sqm2) (CNadj=25)
5 11 Single family Residential districts by average lot size - 2614 3143 3798 9557 257 169 008 443
Residential 1 acre (404683 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 11 Single family Residential districts by average lot size - 2610 3882 1273 7774 051 1557 154 2226
Residential 2 acres (809365 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 31 Banks and Urban Districts - Commercial 7304 909 682 8903 869 144 085 1096
Financial and business (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
Institutions (CNadj=85) (CNadj=85)
8 33 Other offices Urban Districts - Commercial 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
and business (CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 64 Warehousing Urban Districts - Industrial 459 048 503 8496 1146 357 9491
Distribution and (CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
Wholesale (CNadj=72) (CNadj=72)
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
4 is Total sample areas of hydrologic soil group by activity code in Percentage
GIS Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID A B C D
Open Total Open Total Open Total Open Total
1 5040 3259 1694 9994 003 001 001 006
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=65) (CNadj=65)
2 4087 3217 2694 9976 010 009 005 024
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=38) (CNadj=38)
3 3533 3193 3271 10000
(CN=98) (CN=79) (CN=69)
(CNadj=30)
4 3400 3161 3436 10000
(CN=98) (CN=79) (CN=69)
(CNadj=25)
5 2614 3143 3798 9557 257 169 008 443
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 2610 3882 1273 7774 051 1557 154 2226
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 7304 909 682 8903 869 144 085 1096
(CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85)
8 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
(CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 459 048 503 8496 1146 357 9491
(CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
(CNadj=72) (CNadj=72)
Note 1 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
2 is Total sample areas of hydrologic soil group by activity code in Percentage
Page 26: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Area Covered by Soil Type_origi

FSD-AOI CN Result Original

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
GIS Activity Code Rule Samples Total Total CN Adjusted
ID and by Area Areas Areas (Avg) CN
Description (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 123 8688 7025
Residential 18 acre
(0125 acres or 50585 sqm2)
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 1987 8430 5935
Residential 14 acre
(025 acres 101171 sqm2)
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 345 8244 5843
Residential 13 acre
(03330 acres 134759 sqm2)
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 188 8203 5721
Residential 12 acre
(05 acres 202341 sqm2)
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 090 7684 5600
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 016 8527 5824
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 052 9419 8351
Financial and business
Institutions
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 220 9321 8303
and business
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 070 8631 6595
Distribution and
Wholesale
Total 4224 89634 3089 8572 6577
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
GIS Activity Code Hydrologic Soil Group by Character of Surface () with CN amp Adjusted CN (CNadj)
ID and A B C D
Description Impervious Open P Open GtoF
1 11 Single family Residential districts by average lot size - 5040 3259 1694 9994 003 001 001 006
Residential 18 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(0125 acres or 50585 sqm2) (CNadj=65) (CNadj=65)
2 11 Single family Residential districts by average lot size - 4087 3217 2694 9976 010 009 005 024
Residential 14 acre (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(025 acres 101171 sqm2) (CNadj=38) (CNadj=38)
3 11 Single family Residential districts by average lot size - 3533 3193 3271 10000
Residential 13 acre (CN=98) (CN=79) (CN=69)
(03330 acres 134759 sqm2) (CNadj=30)
4 11 Single family Residential districts by average lot size - 3400 3161 3436 10000
Residential 12 acre (CN=98) (CN=79) (CN=69)
(05 acres 202341 sqm2) (CNadj=25)
5 11 Single family Residential districts by average lot size - 2614 3143 3798 9557 257 169 008 443
Residential 1 acre (404683 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(CNadj=20) (CNadj=20)
6 11 Single family Residential districts by average lot size - 2610 3882 1273 7774 051 1557 154 2226
Residential 2 acres (809365 sqm2) (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
(Cnadj=12) (Cnadj=12)
7 31 Banks and Urban Districts - Commercial 7304 909 682 8903 869 144 085 1096
Financial and business (CN=98) (CN=79) (CN=69) (CN=98) (CN=89) (CN=84)
Institutions (CNadj=85) (CNadj=85)
8 33 Other offices Urban Districts - Commercial 026 005 002 032 6454 1099 1349 8903 543 059 020 622 290 060 090 439
and business (CN = 98) (CN =68) (CN = 49) (CN = 98) (CN=79) (CN=69) (CN = 98) (CN =86) (CN = 79) (CN=98) (CN=89) (CN=84)
(CNadj=85) (CNadj=85) (CNadj=85) (CNadj=85)
9 64 Warehousing Urban Districts - Industrial 459 048 503 8496 1146 357 9491
Distribution and (CN = 98) (CN =68) (CN=98) (CN = 79) (CN = 69)
Wholesale (CNadj=72) (CNadj=72)
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total sample areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
4 is Total sample areas of hydrologic soil group by activity code in Percentage
Page 27: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

FSD-AOI CN Result Original

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
GIS Activity Code Rule Samples Total Total CN Adjusted
ID and by Area Areas Areas (Avg) CN
Description (avg)
1 11 Single family Residential districts by average lot size - gt= 01 and lt= 0125 acres 312 3555 acres 123 8688 7025
Residential 18 acre
(0125 acres or 50585 sqm2)
2 11 Single family Residential districts by average lot size - gt 0125 and lt= 025 acres 3284 5766 acres 1987 8430 5935
Residential 14 acre
(025 acres 101171 sqm2)
3 11 Single family Residential districts by average lot size - gt 025 and lt= 03330 acres 357 10006 acres 345 8244 5843
Residential 13 acre
(03330 acres 134759 sqm2)
4 11 Single family Residential districts by average lot size - gt 03330 and lt= 05 acres 140 5451 acres 188 8203 5721
Residential 12 acre
(05 acres 202341 sqm2)
5 11 Single family Residential districts by average lot size - gt 05 and lt= 1 acres 43 261 acres 090 7684 5600
6 11 Single family Residential districts by average lot size - gt 1 and lt= 2 acres 4 456 acres 016 8527 5824
7 31 Banks and Urban Districts - Commercial gt= 05 acres 17 1496 acres 052 9419 8351
Financial and business
Institutions
8 33 Other offices Urban Districts - Commercial gt= 05 acres 56 6396 acres 220 9321 8303
and business
9 64 Warehousing Urban Districts - Industrial gt= 05 acres 11 2004 acres 070 8631 6595
Distribution and
Wholesale
Total 4224 89634 3089 8572 6577
Note 1 The samples of activity codes are similar to the cover type of the urban land cover of the runoff curve number table in the TR-55 (NRCS 1986) publication [Figure 4]
2 The study area is 290142 acres
3 is Total areas of hydrologic soil group by character of surface and hydrologic condition by activity code in Percentage
Page 28: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Map1-Results-06-10-2005 - Table

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID
Map 13 11 Impervious areas 1-40 127098 4372 258 216 210 8140 9722 09429
Open spaces 41-100 163581 5628 244 286 238 9754 8322 06734
Overall Classification Accuracy = 8924 Overall Kappa Statistics = 07857
Map 14 12 Impervious areas 1-45 139227 4790 258 241 229 8876 9502 08976
Open spaces 46-100 151453 5210 244 261 232 9508 8889 07838
Overall Classification Accuracy = 9183 Overall Kappa Statistics = 08368
Map 11 13 Impervious areas 1-50 152654 5252 258 261 247 9574 9464 08896
Open spaces 51-100 138025 4748 244 241 230 9426 9544 09112
Map 15 14 Impervious areas 1-55 167757 5771 258 285 250 9690 8772 07473
Open spaces 56-100 122922 4229 244 217 209 8566 9631 09283
Overall Classification Accuracy = 9143 Overall Kappa Statistics = 0828
Map 12 15 Impervious areas 1-60 184209 6337 258 306 251 9729 8203 06302
Open spaces 61-100 106470 3663 244 196 189 7746 9643 09305
Overall Classification Accuracy = 8765 Overall Kappa Statistics = 07515
Labeling spectral clusters the lower the numbers the darker the areas are label to impervious areas (low NDVI value)
Labeling spectral clusters the higher the numbers are the brighter the areas are label to open spaces (high NDVI value)
Page 29: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Map2-Results-06-10-2005 - Table

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Map Class Name Labeling Criteria Areas (Acres) Areas () Reference Totals Classified Totals Number Correct Producers Accuracy () Users Accuracy () Kappa Statistics
ID Open Spaces
Map 21 21 Poor 1-25 73066 2514 242 239 164 6777 6862 04547
Good to Fair 26-50 64959 2235 328 331 253 7713 7644 0445
Map 22 22 Poor 1-30 90677 3119 242 309 197 8140 6375 03701
Good to Fair 31-50 47349 1629 328 261 216 6585 8276 05939
Overall Classification Accuracy = 7246 Overall Kappa Statistics = 0456
Labeling spectral clusters the lower the numbers the darker the areas are label to open spaces-poor condition (low NDVI value)
Labeling spectral clusters the higher the numbers the brighter the areas are label to open spaces-good to fair condition (high NDVI
value)
Page 30: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Table1

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Table 1 Runoff Curve Numbers for Landsat Land Use Delineations (from Ragan and Jackson 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Forest Land 25 55 70 77
Grassed Open Space 36 60 73 78
Highly Impervious
(Commercial-Industrial-Parking Lot) 90 93 94 94
Residential 60 74 83 87
Bare Ground 72 82 88 90
Page 31: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Table2

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Table 2 Runoff Curve Numbers for Landsat Rural Land Cover Delineations (from Slack and Welch 1980)
Hydrologic Soil Group
Land Use Description
A B C D
Agricultural vegetated 52 68 79 84
Bare Ground 77 86 91 94
Forest Land 30 58 72 78
Page 32: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Table3

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92
Table 3 Pennsylvania Landsat Runoff Curve Numbers (from Bondelid et al 1980)
Hydrologic Soil Group
Land Cover
A B C D
Woods 25 55 70 77
Agricultural 64 75 83 87
Residential 60 74 83 87
Highly Impervious 90 93 94 95
Water 98 98 98 98
Page 33: MAPPING URBAN LAND USE / LAND COVER USING … · mapping urban land use / land cover using quickbird ndvi imagery for runoff curve number determination ... using erdas imagine 8.7.

Table 91

Table 91 Runoff curve numbers for hydrologic soil-cover complexes
Cover
Land use Treatment Hydrologic Hydrologic soil group
or practice condition A B C D
Fallow Straight row ---- 77 86 91 94
Row crops Straight row Poor 72 81 88 91
Straight row Good 67 78 85 89
Contoured Poor 70 79 84 88
Contoured Good 65 75 82 86
Contoured and terraced Poor 66 74 80 82
Contoured and terraced Good 62 71 78 81
Small grain Straight row Poor 65 76 84 88
Straight row Good 63 75 83 87
Contoured Poor 63 74 82 85
Contoured Good 61 73 81 84
Contoured and terraced Poor 61 72 79 82
Contoured and terraced Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
Straight row Good 58 72 81 85
or Contoured Poor 64 75 83 85
rotation Contoured Good 55 69 78 83
meadow Contoured and terraced Poor 63 73 80 83
Contoured and terraced Good 51 67 76 80
Pasture Poor 68 79 86 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
Contoured Fair 25 59 75 83
Contoured Good 6 35 70 79
Meadow Good 30 58 71 78
Woods Poor 45 66 77 83
Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
---- 72 82 87 89
---- 74 84 90 92