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IKONOS Accuracy

IKONOS Accuracy. Image Collection. Use. Simultaneous Pan and Multispectral images 1m panchromatic pixels 4m multispectral pixels (Blue, Green, Red, NIR) Linear detector arrays scan in any direction Swath width >11 km. Photogrammetry. Use. 680-km near-polar, sun-synchronous orbit.

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IKONOS Accuracy

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  1. IKONOS Accuracy Image Collection Use • Simultaneous Pan and Multispectral images • 1m panchromatic pixels • 4m multispectral pixels(Blue, Green, Red, NIR) • Linear detector arrays scan in any direction • Swath width >11 km Photogrammetry Use • 680-km near-polar, sun-synchronous orbit. • GPS receivers determine Ephemeris • Gyros & Star Trackers determine Attitude. • Solid state focal plane with calibrated interior orientation. • Same pass stereo imaging.

  2. Metric 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 Ephemeris Absolute Attitude Knowledge - PAD Ground Processing Verification by On-Orbit Acceptance Test and periodic retest.

  3. Accuracy Test without Ground Control • MTF target is check point. • Accuracy without ground control • ~8 meters CE90

  4. History of Roll Angle Tests

  5. History of Pitch Angle Tests

  6. Metric Accuracy With GCP’s Precision Camera Relative Attitude Knowledge Ground Processing • 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)

  7. Interior Orientation Test

  8. Project With 6 Stereo Strips & 60 GCP # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # N 5 0 5 1 0 M i l e s W E S

  9. Residuals With 0 GCP

  10. Residuals with 1 GCP

  11. Residuals With 3 GCP at One Edge Control at one edge of a project supports high-accuracy mapping across an unfriendly border.

  12. Space Imaging Products

  13. Ground Station Product Levels

  14. Space Imaging Products

  15. Space Imaging Products (*) Accuracy does not include effect of terrain displacement

  16. Georectification to constant height Orthorectification with Digital Elevation Model Rectification

  17. Terrain Displacement • Terrain Displacement: Horizontal position shift caused by vertical errors. • Georectified images DV = Terrain height – Reference height • Orthorectified images DV = Terrain height – DEM height EL = Sensor Elevation Angle DV = Vertical Displacement DH = Horizontal Displacement

  18. Horizontal Accuracy Horizontal Accuracy to International Map Scale Requirement 2.0M (90% CE) = 1: 2,500 Ground Control 12.2M (90% CE) = 1:25,000 25.0M (90% CE) = 1:50,000 Uncontrolled One Meter Image of Mountain View, California

  19. Vertical Accuracy Vertical Accuracy to International Map Scale Requirement 3.0 m (90% CE) = 1: 2,500 Ground Control 11.5 m (90% CE) = 1:25,000 15.0 m (90% CE) = 1:50,000 Uncontrolled Rendered Scene of San Jose, California (Not representative of Space Imaging Product)

  20. IKONOS 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

  21. IKONOS Multispectral Calibration Note: Calibrations apply to imagery processed after 2/22/01. See SE-REF-016 for details & history. • IKONOS multi-spectral bands match Landsat bands 1-4. • IKONOS multi-spectral images have absolute radiometry.

  22. Pan-Sharpening 1-Meter Pan-Sharpened 1-Meter Panchromatic 4-Meter Multispectral

  23. Color- IR vs. Natural Color Imagery

  24. Extracting Detail in Shadows

  25. Image Geometry Model

  26. Space Imaging Products (*) Accuracy does not include effect of terrain displacement

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