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Proceedings Paper

Radiometric stability of the Multi-angle Imaging SpectroRadiometer (MISR) following 15 years on-orbit
Author(s): Carol J. Bruegge; Sebastian Val; David J. Diner; Veljko Jovanovic; Ellyn Gray; Larry Di Girolamo; Guangyu Zhao
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Paper Abstract

The Multi-angle Imaging SpectroRadiometer (MISR) has successfully operated on the EOS/ Terra spacecraft since 1999. It consists of nine cameras pointing from nadir to 70.5° view angle with four spectral channels per camera. Specifications call for a radiometric uncertainty of 3% absolute and 1% relative to the other cameras. To accomplish this, MISR utilizes an on-board calibrator (OBC) to measure camera response changes. Once every two months the two Spectralon panels are deployed to direct solar-light into the cameras. Six photodiode sets measure the illumination level that are compared to MISR raw digital numbers, thus determining the radiometric gain coefficients used in Level 1 data processing. Although panel stability is not required, there has been little detectable change in panel reflectance, attributed to careful preflight handling techniques. The cameras themselves have degraded in radiometric response by 10% since launch, but calibration updates using the detector-based scheme has compensated for these drifts and allowed the radiance products to meet accuracy requirements. Validation using Sahara desert observations show that there has been a drift of ~1% in the reported nadir-view radiance over a decade, common to all spectral bands.

Paper Details

Date Published: 26 September 2014
PDF: 11 pages
Proc. SPIE 9218, Earth Observing Systems XIX, 92180N (26 September 2014); doi: 10.1117/12.2062319
Show Author Affiliations
Carol J. Bruegge, Jet Propulsion Lab. (United States)
Sebastian Val, Jet Propulsion Lab. (United States)
David J. Diner, Jet Propulsion Lab. (United States)
Veljko Jovanovic, Jet Propulsion Lab. (United States)
Ellyn Gray, Jet Propulsion Lab (United States)
Larry Di Girolamo, Univ. of Illinois at Urbana-Champaign (United States)
Guangyu Zhao, Univ. of Illinois at Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 9218:
Earth Observing Systems XIX
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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