12 October 1988 Sensor Calibration For Multiple Direction Reflectance Observations
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Abstract
Spectral and radiometric calibrations of a pointable airborne spectroradiometer called ASAS are discussed. ASAS employs a 512-by-32 element detector array to acquire 29-channel multispectral digital image data. A monochrometer is used to characterize relative spectral responses and to determine spectral band centers with an uncertainty of ±1 nm. The spectral bands are approximately 15 rim wide and the band centers range from 469 nm to 873 nm at approximately 14 nm increments. A laboratory integrating hemisphere is used to characterize the radiometric responses of ASAS detectors. Radiometric responses are linear except for an initial build-up lag in response to low levels of radiance. Assuming radiometric stability in flight, raw ASAS digital counts can be transformed to absolute spectral radiance values with an uncertainty of 5.5% attributable to the laboratory calibration. The calibrations are being applied to radiometrically correct ASAS data acquired from multiple view directions over a tall grass prairie during the 1987 growing season.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James R Irons, James R Irons, Richard R Irish, Richard R Irish, } "Sensor Calibration For Multiple Direction Reflectance Observations", Proc. SPIE 0924, Recent Advances in Sensors, Radiometry, and Data Processing for Remote Sensing, (12 October 1988); doi: 10.1117/12.945678; https://doi.org/10.1117/12.945678
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