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Proceedings Paper

Recent progress of MODIS solar diffuser on-orbit degradation characterization
Author(s): H. Chen; Z. Wang; J. Sun; A. Angal; X. Xiong
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Paper Abstract

An on-board Solar Diffuser (SD) is used for the MODIS reflective solar bands (RSB) calibration. Its on-orbit bidirectional reflectance factor (BRF) degradation is tracked using an on-board Solar Diffuser Stability Monitor (SDSM). The SDSM is a ratioing radiometer with nine detectors, covering wavelengths from 412 nm to 936 nm. During each scheduled SD calibration event, the SDSM makes alternate observations of the Sun and the sunlight reflected by the SD. To best match the SDSM detector signals from its Sun view and SD view, a fix attenuation screen is placed in its Sun view path. This paper provides a brief description of MODIS RSB on-orbit calibration and the use of its on-board SD and SDSM subsystem, including different approaches developed and used to track MODIS SD on-orbit degradation. It reports recent progress made to better characterize MODIS SD on-orbit degradation and to support MODIS Level 1B (L1B) calibration look-up table (LUT) updates for the upcoming collection 6 (C6) reprocessing. Results of both Terra and Aqua SD on-orbit degradation derived from newly improved SDSM Sun view screen vignetting function and response fitting strategy, and their impact on RSB calibration uncertainties are also presented.

Paper Details

Date Published: 15 October 2012
PDF: 10 pages
Proc. SPIE 8510, Earth Observing Systems XVII, 85100I (15 October 2012); doi: 10.1117/12.929705
Show Author Affiliations
H. Chen, Sigma Space Corp. (United States)
Z. Wang, Sigma Space Corp. (United States)
J. Sun, Sigma Space Corp. (United States)
A. Angal, Science Systems and Applications, Inc. (United States)
X. Xiong, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 8510:
Earth Observing Systems XVII
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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