radiometric and geometric calibration workshop camera calibration program in the united states:...
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Radiometric and Geometric Calibration Workshop
Camera calibration program in the United States: past, present, and
future
U.S. Department of the InteriorU.S. Geological Survey
Radiometric and Geometric Calibration Workshop
Background:
• USGS camera calibration responsibility
• Responsibility transferred to the USGS in 1973
• Laboratory calibration using multi-collimators
• Calibration instrument designed for metric 230- x 230-mm film-base aerial cameras
Radiometric and Geometric Calibration Workshop
Background:• Evolution of digital technology:
• Photogrammetric scanners over fifteen years ago• Small-format cameras being used for years by a
small sector of the mapping community• Large-format aerial cameras have been in
development for years and have emerged• Non-optical sensors playing a bigger role• 1-meter and sub-meter products from satellites
Radiometric and Geometric Calibration Workshop
Background:
• USGS failure to be prepared for digital cameras resulted in:
• Lack of experience with digital cameras
• Lack of instrumentation to continue calibrations
• Lack of upgrade strategy from analog to digital
• Lack of standards and policies
Radiometric and Geometric Calibration Workshop
Complicating issues:
• Inability to perform laboratory calibration on small format digital cameras
• Different designs of digital cameras• Different hardware/software solutions• Integration of cameras with other systems such
as IMU and airborne-GPS equipment
Radiometric and Geometric Calibration Workshop
The bottom line for calibration:
• Ensuring quality of the end-product
But:
• Who does it?• How is it done?
Radiometric and Geometric Calibration Workshop
Current approval authorities:• For now:
• USGS (cameras)• USGS and other agency contracting offices (product
characterizations)
• Future may include:• Government-approved independent
evaluators/consultants• UL-type organization
Radiometric and Geometric Calibration Workshop
How?
• Component calibration (camera calibration)• System calibration (LIDAR systems)• Process evaluation (error budget analysis)• Product characterization (satellite products)• ISO certification (quality management plan)
Radiometric and Geometric Calibration Workshop
USGS camera calibration efforts:
• Stabilization of analog calibration instrument• Development and installation of interim
calibration capability for small-format cameras• Development of in-situ calibration site and
software
Radiometric and Geometric Calibration Workshop
Analog calibration:
Radiometric and Geometric Calibration Workshop
Analog calibration:
• Maintain current policy• Continue to provide camera calibrations on a
cost recovery basis
Radiometric and Geometric Calibration Workshop
Interim digital capability at EDC:
Radiometric and Geometric Calibration Workshop
Interim digital capability:• Testing stability of calibrations with USGS
camera• Calibration of other cameras on a research
basis• Comparison of results with other laboratory
calibration methods• Comparison of results with in-situ calibration
approach
Radiometric and Geometric Calibration Workshop
In-situ calibration:
• Initial operating capability to include site preparation, software development, and testing with USGS camera
• Operational testing with other cameras for comparisons in stability
• Extension of software to allow other in-situ sites
Radiometric and Geometric Calibration Workshop
SSC Remote Sensing Radial Target
and Edge Response Targets
Product Characterizations over NASA Stennis Test Range
Radiometric and Geometric Calibration Workshop
Product Characterizations:
• Performed under USGS/NASA agreement• First round funded by USGS• Data acquisition over Stennis test site• Data provider generates end-product to be
evaluated (e.g., 1-foot resolution DOQ)• NASA performs evaluation• USGS provides acceptance letter
Radiometric and Geometric Calibration Workshop
Future work:
• Perform radiometry testing• Comparison of calibration methods• Evaluation of product characterizations• Development of in-situ calibration standards• Development of related standards
Radiometric and Geometric Calibration Workshop
Contact information:
• George Lee, USGS, 650-329-4255, [email protected]
• Greg Stensaas, USGS, 605-594-2569, [email protected]
• Vicki Zanoni, NASA, 228-688-2305, [email protected]