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Outline

Nevada Test Site Calibration Range and Geometric Calibration of Digital Cameras ISPRS I/2 Bob Kletzli Spectrum Mapping, LLC December 2-4, 2003. Outline. Engineer Sensor For Geometric Stability Lock Lenses at Infinity Before Calibration Lab Radiometric Calibration

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Outline

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  1. Nevada Test Site Calibration Range and Geometric Calibration of Digital CamerasISPRS I/2Bob KletzliSpectrum Mapping, LLCDecember 2-4, 2003

  2. Outline • Engineer Sensor For Geometric Stability • Lock Lenses at Infinity Before Calibration • Lab Radiometric Calibration • Terrestrial Geometric Calibration • In Situ Calibration • Calibration Verification NTS

  3. Geometric Stability • CDD Fixed To Milled Optical Bench • Lens Receptacle Is Opposite Side • Each Lens Fixed To Aluminum Socket • Lenses Are Interchangeable • Alignment Pins Eliminate Rotation • TEC Surrounds CCD • “Shake and Bake”

  4. Lens Focus • Lens Focused At Infinity • High Frequency Target At 100m • Each Lens Adjusted & Pinned

  5. Radiometric Calibration • Lab Tools Include: • Integrating Sphere • Spectralon Panels • Spectral Line Lamps • Lab Processes • Dark Current • Flat Fielding • White Balance

  6. Terrestrial Range

  7. Terrestrial Camera Stations

  8. Bundle Result 1

  9. Bundle Result 2

  10. Bundle Result 3

  11. Bundle Summary

  12. Insitu Range (NM) • 400+ points by RTK • 2-3 cm accuracy • Photo Identifiable • Variable terrain • Used for both laser & photography • Building corners surveyed

  13. Insitu Range Closeup

  14. NTS Calibration Range

  15. NTS LandSat

  16. NTS Site

  17. Flight Plan

  18. GPS Trajectory NLV to NTS

  19. GPS Fwd/Rev RMS (NLV)

  20. GPS Fwd/Rev RMS (NTS)

  21. 1:12,000 Images/Control

  22. 1:12,000 Flight

  23. 1:18,000 Images/Control

  24. 1:18,000 Flight

  25. 1:24,000 Images/Control

  26. 1:24,000 Flight

  27. Summary • Digital Cameras Can be Calibrated to Conventional Specifications • Calibrations Are Maintained Over Time • Regional Test Ranges Are Extremely Useful For Calibration and Verification

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