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Proceedings Paper

Sensor Calibration For Multiple Direction Reflectance Observations
Author(s): James R Irons; Richard R Irish
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Paper 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.

Paper Details

Date Published: 12 October 1988
PDF: 11 pages
Proc. SPIE 0924, Recent Advances in Sensors, Radiometry, and Data Processing for Remote Sensing, (12 October 1988); doi: 10.1117/12.945678
Show Author Affiliations
James R Irons, NASA/Goddard Space Flight Center (United States)
Richard R Irish, Science Applications Research (United States)

Published in SPIE Proceedings Vol. 0924:
Recent Advances in Sensors, Radiometry, and Data Processing for Remote Sensing
Philip N. Slater, Editor(s)

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