IKONOS Accuracy
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Transcript of 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
Space Imaging Proprietary
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.
Space Imaging Proprietary
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
0
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
Space Imaging Proprietary
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
Space Imaging Proprietary
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
Space Imaging Proprietary
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
Space Imaging Proprietary
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
Space Imaging Proprietary
Project With 6 Stereo Strips & 60 GCPProject With 6 Stereo Strips & 60 GCP
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5 0 5 10 MilesN
EW
S
Space Imaging Proprietary
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
Space Imaging Proprietary
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
Space Imaging Proprietary
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
Space Imaging Proprietary
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 Proprietary
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
Space Imaging Proprietary
Space Imaging ProductsSpace Imaging Products
(*) 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
Space Imaging Proprietary
RectificationRectification
Georectification to constant height
Orthorectification with Digital Elevation Model
DEM
Ortho-rectifiedImage
Topo-graphicSurface
ReferenceElevation ofGeo Image
Space Imaging Proprietary
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
Space Imaging Proprietary
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
Space Imaging Proprietary
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
Space Imaging Proprietary
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
Space Imaging Proprietary
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.
Space Imaging Proprietary
1-Meter Panchromatic4-Meter Multispectral
1-Meter Pan-Sharpened
Pan-SharpeningPan-Sharpening
Space Imaging Proprietary
Color- IR vs. Color- IR vs. Natural Color ImageryNatural Color Imagery
Space Imaging Proprietary
Extracting Detail in ShadowsExtracting Detail in Shadows
Space Imaging Proprietary
Image Geometry ModelImage Geometry Model
Space Imaging Proprietary
Space Imaging ProductsSpace Imaging Products
(*) 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