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Ground Facility for Vicarious Calibration of Skyborne SensorsAn automated ground facility, for vicarious radiometric calibration of airborne and spaceborne sensors of visible and infrared light has been established. In the term "vicarious calibration," "vicarious" is used in the sense of "in place of another," signifying "in place of laboratory calibration." Vicarious calibration involves the use of ground truth in the form of measurements by ground-viewing radiometers, a Sun-viewing photometer, and meteorological instruments positioned in a ground target area. The instrumentation at the facility includes a light-emitting-diode spectrometer (LSpec), which consists of eight tripod-mounted, ground-viewing radiometer units containing LEDs biased to operate as photodetectors (instead of light emitters) at their respective wavelengths. The LSpec provides an essentially continuous stream of measurements at eight discrete wavelengths. These are merged with spectral surface-reflectance measurements made on occasional site visits to obtain temporally continuous coverage with high spectral resolution.
Document ID
20090011268
Acquisition Source
Jet Propulsion Laboratory
Document Type
Other - NASA Tech Brief
Authors
Bruegge, Carol
(California Inst. of Tech. Pasadena, CA, United States)
Jackson, Shannon
(California Inst. of Tech. Pasadena, CA, United States)
Helmlinger, Mark
(Northrop Grumman Space Technology Redondo Beach, CA, United States)
Date Acquired
August 24, 2013
Publication Date
July 1, 2008
Publication Information
Publication: NASA Tech Briefs, July 2008
Subject Category
Man/System Technology And Life Support
Report/Patent Number
NPO-45425
Distribution Limits
Public
Copyright
Public Use Permitted.
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