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Nevada Test Site Calibration Range for Digital Cameras

This paper discusses the calibration and geometric stability of digital cameras at the Nevada Test Site Calibration Range. Topics include sensor engineering, radiometric calibration, terrestrial geometric calibration, in situ calibration, and calibration verification. The results show the effectiveness of using regional test ranges for camera calibration and verification.

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Nevada Test Site Calibration Range for Digital Cameras

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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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