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Proceedings Paper

Assessment of the MODIS RSB detector differences using earth-view targets
Author(s): Amit Angal; Junqiang Sun; Xu Geng; Mike Chu; Xiaoxiong Xiong
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Paper Abstract

MODIS has 20 reflective solar bands (RSB) with a total of 330 individual detectors. Currently, there are two nearly identical MODIS instruments operating in space: one on the Terra spacecraft launched in December 1999 and another on the Aqua spacecraft launched in May 2002. MODIS reflective solar bands (RSB) are calibrated on-orbit by a system that consists of a solar diffuser (SD) and a solar diffuser stability monitor (SDSM). Near-monthly lunar observations are also used to track the sensor response versus scan angle (RVS) change on-orbit. On-orbit observations show that the changes in the detector response are wavelength, scan-angle and mirror side dependent. This paper provides a comprehensive assessment of the detector-to-detector calibration differences in the MODIS VIS/NISR spectral bands using the on-board calibrators and earth-view (EV) level 1B (L1B) data products. Different EV targets are analyzed to accommodate the high-gain ocean bands which tend to saturate over land surfaces. The results from this study highlight the necessity of the constant monitoring of the detector-level gain and its change as a function of scan-angle, as implemented in the MODIS Collection 6 (C6) products.

Paper Details

Date Published: 23 September 2013
PDF: 9 pages
Proc. SPIE 8866, Earth Observing Systems XVIII, 88661T (23 September 2013); doi: 10.1117/12.2023636
Show Author Affiliations
Amit Angal, Science Systems and Applications, Inc. (United States)
Junqiang Sun, Sigma Space Corp. (United States)
Xu Geng, Sigma Space Corp. (United States)
Mike Chu, Sigma Space Corp. (United States)
Xiaoxiong Xiong, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 8866:
Earth Observing Systems XVIII
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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