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Proceedings Paper

Determination of the SNPP VIIRS solar diffuser BRDF degradation factor over wavelengths longer than 1μm
Author(s): Ning Lei; Xiaoxiong Xiong
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Paper Abstract

To radiometrically calibrate its reflective solar bands, the Visible Infrared Imaging Radiometer Suite (VIIRS) aboard the Suomi National Polar-orbiting Partnership (SNPP) satellite observes a sunlit onboard solar diffuser (SD). Once on orbit, the bidirectional reflectance distribution function (BRDF) of the SD degrades over time. The degradation factor is determined by an onboard solar diffuser stability monitor (SDSM). However, the central wavelengths (414 to 929 nm) of the SDSM detectors do not cover the VIIRS short wave infrared (SWIR) bands which have central wavelengths from 1238 to 2257 nm. Although it is known that at wavelengths longer than 1 m the SD BRDF degrades at a much slower rate, the degradation at some of the SWIR bands’ central wavelengths may still be non-negligible as Ocean Color products often require a radiometric calibration stability of at least 0.1%. To access the SD BRDF degradation factor in the SWIR bands wavelength region, we investigate a phenomenological model and apply the model to determine the degradation factor in the SWIR bands wavelength region.

Paper Details

Date Published: 8 September 2015
PDF: 9 pages
Proc. SPIE 9607, Earth Observing Systems XX, 96071W (8 September 2015); doi: 10.1117/12.2186633
Show Author Affiliations
Ning Lei, Science Systems and Applications, Inc. (United States)
Xiaoxiong Xiong, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 9607:
Earth Observing Systems XX
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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