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Degradation of MODIS Optics and its Reflective Solar Bands CalibrationThe MODerate Resolution Imaging Spectroradiometer (MODIS) has 36 spectral bands with wavelength ranging from 0.41 micron to 14.5 micron and spatial resolution between 0.25, 0.5, and 1.0 km at Nadir. Its ProtoFlight Model (PFM) on the NASA EOS Terra spacecraft has been providing global coverage of the Land, Ocean, and Atmosphere for the science community since the instrument opened its Nadir door on 24 February 2000. The MODIS optical system consists of a 2-sided paddle wheel scan mirror, a fold mirror, a primary mirror, and other aft optics. The sensor's 20 reflective solar bands from 0.41 to 2.1 micron are calibrated on-orbit by a solar diffuser (SD) and a solar diffuser stability monitor (SDSM). In addition to SD, degradation of the MODIS optics in the reflective solar bands has been observed, including variations in degradation between the two sides of the MODIS scan mirror. During MODIS first year of on-orbit operation, the overall degradations at the shortest wavelength (0.41 micron) are about 3% for SD, and in excess of 10% for the MODIS system. In this paper, we will present our degradation analysis results and discuss their impact on the reflective solar bands' on-orbit calibration.
Document ID
20010106387
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Xiong, X.
(Science Systems and Applications, Inc. Lanham, MD United States)
Sun, J.
(Science Systems and Applications, Inc. Lanham, MD United States)
Esposito, J.
(Science Systems and Applications, Inc. Lanham, MD United States)
Pan, C.
(Science Systems and Applications, Inc. Lanham, MD United States)
Xiong, S.
(Science Systems and Applications, Inc. Lanham, MD United States)
Guenther, B.
(Lockheed Martin Corp. Silver Spring, MD United States)
Barnes, W. L.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Degnan, John
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Subject Category
Optics
Meeting Information
Meeting: 8th International Symposium on Remote Sensing
Location: Toulouse
Country: France
Start Date: September 17, 2001
End Date: September 21, 2001
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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