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 Terrestrial Geometric Calibration In Situ Calibration Calibration Verification NTS

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”

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

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

Terrestrial Range

Terrestrial Camera Stations

Bundle Result 1

Bundle Result 2

Bundle Result 3

Bundle Summary

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

Insitu Range Closeup

NTS Calibration Range

NTS LandSat

NTS Site

Flight Plan

GPS Trajectory NLV to NTS

GPS Fwd/Rev RMS (NLV)

GPS Fwd/Rev RMS (NTS)

1:12,000 Images/Control

1:12,000 Flight

1:18,000 Images/Control

1:18,000 Flight

1:24,000 Images/Control

1:24,000 Flight

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