IKONOS Accuracy

Space Imaging Proprietary

IKONOS AccuracyIKONOS Accuracy

Use• Simultaneous Pan and Multispectral imagesSimultaneous Pan and Multispectral images

• 1m panchromatic pixels1m panchromatic pixels

• 4m multispectral pixels4m multispectral pixels(Blue, Green, Red, NIR)(Blue, Green, Red, NIR)

• Linear detector arrays scan in any directionLinear detector arrays scan in any direction

• Swath width >11 km Swath width >11 km

Image Collection

Use• 680-km near-polar, sun-synchronous orbit.680-km near-polar, sun-synchronous orbit.

• GPS receivers determine Ephemeris GPS receivers determine Ephemeris

• Gyros & Star Trackers determine Attitude. Gyros & Star Trackers determine Attitude.

• Solid state focal plane with calibrated Solid state focal plane with calibrated interior orientation.interior orientation.

• Same pass stereo imaging.Same pass stereo imaging.

Photogrammetry


Metric Accuracy Without GCP’sMetric Accuracy Without GCP’s

Requirements:- 25.4 meter CE90 Horizontal accuracy with 1 stereo pair- 22.0 meter LE90 Vertical accuracy with 1 stereo pair- 12.2 meter CE90 Horizontal accuracy with 3 stereo pairs- 10.0 meter LE90 Vertical accuracy with 5 stereo pairs x

Stable Optical Platform

Ground Processing

Ephemeris Absolute Attitude Knowledge - PAD

Verification by On-Orbit Acceptance Test and periodic retest.


Accuracy Test without Ground Accuracy Test without Ground ControlControl

MTF target is check point. Accuracy without ground

control ~8 meters CE90

Historical Adjusted Attitude Error TestsCircle = 10m

-20

-15

-10

-5

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5

10

15

20

-20 -15 -10 -5 0 5 10 15 20

Pointing Error, meters Easting

Poi

ntin

g E

rror

, met

ers

Nor

thin

g


History of Roll Angle TestsHistory of Roll Angle Tests

Pointing Error, meters Easting

-20.0

-15.0

-10.0

-5.0

0.0

5.0

10.0

15.0

20.0

12/1/1999 3/30/2000 7/28/2000 11/25/2000 3/25/2001 7/23/2001 11/20/2001

Fwd Easting

Rev Easting


History of Pitch Angle TestsHistory of Pitch Angle Tests

Pointing Error, meters Northing

-20.0

-15.0

-10.0

-5.0

0.0

5.0

10.0

15.0

20.0

12/1/1999 3/30/2000 7/28/2000 11/25/2000 3/25/2001 7/23/2001 11/20/2001

Fwd Northing

Rev Northing


Metric Accuracy With GCP’sMetric Accuracy With GCP’s

Mapping (1:2,400)- 2 meter Horizontal Accuracy- 1 meter GSD

Requires - Mono image within 10° of nadir - GCP every 6km along image strip - Stereo image (or 3m LE90 DEM)

Precision Camera Relative Attitude Knowledge

Ground Processing


Interior Orientation TestInterior Orientation Test

Residual - Sam ple

-2.0-1.00.01.02.0

-6.0-4.0-2.00.02.04.06.0

West - East, km

Residual - Line

-2.0-1.00.01.02.0

-6.0-4.0-2.00.02.04.06.0

West - East, km


Project With 6 Stereo Strips & 60 GCPProject With 6 Stereo Strips & 60 GCP

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5 0 5 10 MilesN

EW

S


Residuals With 0 GCPResiduals With 0 GCP

Statistic Value

Average X -5.0

Average Y 6.2

Average Z 1.6

Sigma X 1.0

Sigma Y 1.1

Sigma Z 2.0

RMS Horiz. 8.0

RMS Vert. 2.6

CE90 8.2


Residuals with 1 GCPResiduals with 1 GCP

Statistic Value

Average X -2.4

Average Y 0.5

Average Z -1.1

Sigma X 1.0

Sigma Y 1.1

Sigma Z 2.0

RMS Horiz. 2.6

RMS Vert. 2.3

CE90 3.3


Residuals With 3 GCP Residuals With 3 GCP at One Edgeat One Edge

Statistic Value

Average X -0.4

Average Y 0.3

Average Z 0.2

Sigma X 1.0

Sigma Y 1.1

Sigma Z 2.0

RMS Horiz. 1.1

RMS Vert. 2.0

CE90 2.2

Control at one edge of a project supports high-accuracy mapping across an unfriendly border.

Space Imaging ProductsSpace Imaging Products


Level 1 Radiometrically-Corrected Oriented to sensor path, corrected for transmission errors, adjusted for brightness/contrast

Level 2 Standard Geometrically-Corrected Corrected for systematic distortions, no ground control points or terrain elevation required

Level 3 Precision Geometrically-Corrected Ground control points improve product accuracy Rectified to a constant elevation

Level 4 Orthorectified Corrected for terrain relief, standard error (RMSE) of 1-meter less than 10 degrees from Nadir with GCP.

Level 5 Digital Terrain Data Precision terrain information and stereoscopic imagery pairs

Level 6 Pan-Sharpened 4-meter data sharpened with 1-meter black-and-white

Level 7 Mosaics Digitally assembled images to create large contiguous area, applied to Levels 2, 3, 4 and 6

Ground Station Product LevelsGround Station Product Levels


Space Imaging ProductsSpace Imaging ProductsProduct Description

Geo Low cost, quick look, map-oriented image

Reference Ortho image for small-scale 1:50K mapping

Pro Ortho image for medium-scale 1:12K mapping

Precision Ortho image for large-scale 1:5K mapping

Precision Plus Ortho image for 1:2500 mapping

ITM (IKONOS Terrain Model)

DEM (Digital Elevation Model) with 1 arc-second post spacing and ±12m accuracy (LE90)

Reference Stereo Stereo models for DEM & 3-D feature extraction for small scale 1:50K maps.

Precision Stereo Stereo models for DEM & 3-D feature extraction for large scale 1:5K maps.

Precision+ Plus Stereo

Stereo models for DEM & 3-D feature extraction for large scale 1:2500 maps.

Ortho-Kit Near-nadir, georectified image with Image Geometry Model



(*) Accuracy does not include effect of terrain displacement(*) Accuracy does not include effect of terrain displacement

Name Rectification CE90 RMS

GCP DEM

IGM

Geo Geo 50m* 25

Reference Ortho 25m 12

Pro Ortho 10m 5

Precision Ortho 4m 2

ITM DEM (LE90) 12m 7

Reference

Stereo

Epi-polar

(LE90)

25m

22m

12

14

Precision

Stereo

Epi-polar

(LE90)

4m

6m

2

4

Ortho-Kit Geo 50m* 25


RectificationRectification

Georectification to constant height

Orthorectification with Digital Elevation Model

DEM

Ortho-rectifiedImage

Topo-graphicSurface

ReferenceElevation ofGeo Image


EL

DH

DV

Zenith Sensor

Earth

DEM

Terrain DisplacementTerrain Displacement

EL = Sensor Elevation AngleDV = Vertical DisplacementDH = Horizontal Displacement

Terrain Displacement:Horizontal position shift

caused by vertical errors.

Georectified imagesDV = Terrain height – Reference height

Orthorectified imagesDV = Terrain height – DEM height


One Meter Image ofMountain View, California

Horizontal Accuracy toInternational Map Scale

Requirement

2.0M (90% CE) = 1: 2,500Ground Control

12.2M (90% CE) = 1:25,00025.0M (90% CE) = 1:50,000

Uncontrolled

Horizontal AccuracyHorizontal Accuracy


Rendered Scene of San Jose, California(Not representative of Space Imaging Product)

Vertical Accuracy toInternational Map Scale

Requirement

3.0 m (90% CE) = 1: 2,500Ground Control

11.5 m (90% CE) = 1:25,00015.0 m (90% CE) = 1:50,000

Uncontrolled

Vertical AccuracyVertical Accuracy


IKONOS PixelsIKONOS Pixels

4 meter multi-spectral pixels(Blue, Green, Red, NIR)~ Landsat Bands 1 - 4

1 meter panchromatic pixels High resolution texture

Simultaneously collected Solid state image detectors Digital recording & transmission 11-bit grayscale resolution Swath width

13816 pan pixels 3454 MSI pixels

4m

1m

4m

1m


IKONOS Multispectral CalibrationIKONOS Multispectral Calibration

Note: Calibrations apply to imagery processed after 2/22/01. See SE-REF-016 for details & history.

IKONOS2 Relative Spectral Response

0

0.2

0.4

0.6

0.8

1

350 550 750 950

Wavelength (nm)

Rel

ativ

e S

pec

tral

R

esp

on

sivi

ty

Pan

Blue

Green

Red

NIR

IKONOS multi-spectral bands match Landsat bands 1-4. IKONOS multi-spectral images have absolute radiometry.


1-Meter Panchromatic4-Meter Multispectral

1-Meter Pan-Sharpened

Pan-SharpeningPan-Sharpening


Color- IR vs. Color- IR vs. Natural Color ImageryNatural Color Imagery


Extracting Detail in ShadowsExtracting Detail in Shadows


Image Geometry ModelImage Geometry Model



(*) Accuracy does not include effect of terrain displacement(*) Accuracy does not include effect of terrain displacement

Name Rectification CE90 RMS

GCP DEM

IGM

Geo Geo 50m* 25

Reference Ortho 25m 12

Pro Ortho 10m 5

Precision Ortho 4m 2

ITM DEM (LE90) 12m 7

Reference

Stereo

Epi-polar

(LE90)

25m

22m

12

14

Precision

Stereo

Epi-polar

(LE90)

4m

6m

2

4

Ortho-Kit Geo 50m* 25

IKONOS Accuracy

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