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Proceedings Paper

Characterization of MODIS and SeaWiFS solar diffuser on-orbit degradation
Author(s): X. Xiong; R. E. Eplee; J. Sun; F. S. Patt; A. Angal; C. R. McClain
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Paper Abstract

MODIS has 20 reflective solar bands (RSB), covering the VIS, NIR, and SWIR spectral regions. They are calibrated on-orbit using a solar diffuser (SD) panel, made of space-grade Spectralon. The SD bi-directional reflectance factor (BRF) was characterized pre-launch by the instrument vendor with reference to the NIST reflectance standard. Its on-orbit degradation is tracked by an on-board solar diffuser stability monitor (SDSM). The SeaWiFS on-orbit calibration strategy uses monthly lunar observations to monitor the long-term radiometric stability of the instrument and applies daily observations of its solar diffuser (an aluminum plate coated with YB71 paint) to track the short-term changes in the instrument response. This paper provides an overview of MODIS and SeaWiFS SD observations, applications, and approaches used to track their on-orbit degradations. Results from both sensors are presented with emphasis on the spectral dependence and temporal trends of the SD degradation. Lessons and challenges from the use of SD for sensor on-orbit calibration are also discussed.

Paper Details

Date Published: 21 August 2009
PDF: 10 pages
Proc. SPIE 7452, Earth Observing Systems XIV, 74520Y (21 August 2009); doi: 10.1117/12.824797
Show Author Affiliations
X. Xiong, NASA Goddard Space Flight Ctr. (United States)
R. E. Eplee, Science Applications International Corp. (United States)
J. Sun, Science Systems and Applications, Inc. (United States)
F. S. Patt, Science Applications International Corp. (United States)
A. Angal, Science Systems and Applications, Inc. (United States)
C. R. McClain, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 7452:
Earth Observing Systems XIV
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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