Madhavi priyanka
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Transcript of Madhavi priyanka
RS GIS FOR GROWTH AND EXPANSION OF
CITY (URBAN SPRAWL)
PRESENTED BY :-
MADHAVI LATHA BHUMIREDDYPRIYANKA KANPHADE
Urban Expansion & Sprawl?• As population increases in an area or a city, the boundary of
the city expands in an unplanned manner to accommodate
the growth; this expansion is termed as sprawl
• It is the spread of human population away from central urban
areas into previously remote and rural areas.
• Urban sprawl is an uncontrolled and uncoordinated spread of
urban population around a city.
• Expansion of town and cities is considered with respect to the
increase of the size of a built-up area.
URBAN SPRAWL
URBAN SPRAWL
• Population growth
• Industrialization
• Living and property cost
• Lack of affordable housing
• Independence of decision
• Lack of proper planning policies
• Large plot Size
CAUSES CONSEQUENCES
• Impacts on Wildlife and Ecosystem
• Loss of Farmland
• Poor Air Quality
• Inflated Infrastructure and Public
Service Costs
• Impacts on Water Quality and
Quantity
• formation of slums
• increase traffic congestions
CASE STUDY 1
REMOTE SENSING, GEOGRAPHIC INFORMATION SYSTEMSAND SHANNON’S ENTROPY: MEASURING URBAN SPRAWL
IN A MOUNTAINOUS ENVIRONMENTL. C. O. Verzosa , R. M. Gonzalez
• Baguio city is a mountainous region in Phillipines.
• DATA USED
SATELLITE DATA Landsat Images (1979, 1989, 1992, 2002)
Aerial Photographs (2003)
Topographic Map National Mapping and Resource Information Agency
• SOFTWARE USED
ENVI 4.3®
ERDAS-Imagine
GIS software ArcGIS 9.3®.
• The integration of RS and GIS is used in adopting Shannon’s entropy to measure
urban sprawl.
Shannon’s entropy is an index used in quantifying the degree of dispersion or concentration of built-up areas. given by,
Where, pi is the probability or proportion of occurrence of a phenomenon in the ith spatial unit out of n units, and thus, is given by
where Xi is the area of built-up at the ith unit
METHODOLOGY:
SIGNIFICANCE OF ENTROPY VALUE
0 – concentrated patternlog n – maximum value denotes dispersed distribution.
Increasing entropy values indicates continuous dispersion with built-up highly occurring. Decreasing values signifies that an area is becoming less fragmented and homogenously covered, thus, further occurrence of built-up is less likely to happen.
OBSERVATIONS:
• This study shows that entropy is a good indicator in identifying and monitoring land development—that is, dispersion and concentration of built-up areas.
• Remote sensing data are more widely used for the analysis of pattern and process rather than understanding the causes or consequences.
• Conventionally provides a means of accessing a large geographical area with limited time and resources.
CASE STUDY 2
Evaluation of Urban Sprawl and Land use Land cover Change using Remote Sensing and GIS Techniques: A Case
Study of Jaipur City, India Sunil Sankhala, B. K. Singh
• Jaipur is situated in Rajasthan at 26.92°N latitude & 75.82°E longitude.
• Data Sources :
1. Satellite Data:
I. IRS LISS II (1995);
II. IRS LISS III (2000, 2006);
III. LANDSAT TM (2010)
2. Survey of India Toposheets: 54A/4, 54B/1, 45N/5, 45M/12, 45M/16, 45N/13,
45N/9, 45N/10, 45N/14 of Jaipur district and adjoining districts.
• Software used:
ERDAS-Imagine 9.2
GIS software Arc GIS 9.2 & Arc view 3.2
METHODOLOGY:
• IRS LISS-II (1995), LISS-III (2000, 2006) and LANDSAT TM (2010) satellite images have been used for generation of land use/ land cover map.• The satellite data was enhanced before classification using
histogram equalization in ERDAS Imagine .• The data was resampled to a common spatial resolution of
23.5 m.• Then Landuse/landcover classification was performed
through digitization processes.
MAP SHOWING LINEAR URBAN SPRAWL
MAP SHOWING LEAPFROG URBAN SPRAWL
OBSERVATIONS:
• The sprawl location maps generated from the interpretation of satellite imagery reveals that sprawl is towards the north-west and south-east of the city.
• The prime causes behind such expansion has been availability of land at considerably cheaper rate in those areas, good transport communicational network, availability of better infrastructural and institutional amenities, nearness to the main city
• Jaipur is witnessing three major kind of sprawling, (i) Linear, (ii) Leap frog, (iii)Radial. At some places polycentric sprawl is also observed.
CONCLUSION:
• Remote sensing and GIS techniques facilitates delineation, tracking down and monitoring of urban development.
• RS provides pattern recognition techniques to classify land cover based on their spectral characteristics on satellite images.
• Satellite data are found to be useful in mapping and quantifying the extent of urban area in different time periods.
• GIS enables the proper handling of databases necessary for the integration of data from different sources and for analysing the urban sprawl extent.
REFERENCES• L. C. O. Verzosa, R. M. Gonzalez, Austria, July 5–7, 2010, “Remote Sensing,
Geographic Information Systems And Shannon’s Entropy: Measuring Urban Sprawl In A Mountainous Environment”
• Feng Li, Prof. Dr.-Ingo . Stefan Siedentop ,” Applying Remote Sensing And GIS On Monitoring And Measuring Urban Sprawl –A Case Study Of China”
• Sunil Sankhala , B. K. Singh , IJETAE, Volume 4, Issue 1, January 2014, “Evaluation Of Urban Sprawl And Land Use Land Cover Change Using Remote Sensing And GIS Techniques: A Case Study Of Jaipur City, India “
• B. Bhatta ,” Analysis Of Urban Growth And Sprawl From Remote Sensing Data, Causes And Consequences Of Urban Growth And Sprawl, Springer Chapter 2”
• Monalisha Mishra, Kamal Kant Mishra, A.P. Subudhi, “Urban Sprawl Mapping And Land Use Change Analysis Using Remote Sensing And GIS (case Study Of Bhubaneswar City, Orissa)”