8 September 2015 Determination of the SNPP VIIRS solar diffuser BRDF degradation factor over wavelengths longer than 1μm
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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.
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Ning Lei, Ning Lei, Xiaoxiong Xiong, Xiaoxiong Xiong, } "Determination of the SNPP VIIRS solar diffuser BRDF degradation factor over wavelengths longer than 1μm", Proc. SPIE 9607, Earth Observing Systems XX, 96071W (8 September 2015); doi: 10.1117/12.2186633; https://doi.org/10.1117/12.2186633
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