Determination of the solar angular dependence of the NOAA-20 VIIRS solar diffuser BRDF change factor

Ning Lei; Xiaoxiong Xiong

doi:10.1117/12.2529783

9 September 2019 Determination of the solar angular dependence of the NOAA-20 VIIRS solar diffuser BRDF change factor

Ning Lei, Xiaoxiong Xiong

Proceedings Volume 11127, Earth Observing Systems XXIV; 111271Q (2019) https://doi.org/10.1117/12.2529783
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

When fully illuminated by the Sun, the solar diffuser (SD) onboard of the NOAA-20 Visible Infrared Imaging Radiometer Suite (VIIRS) instrument provides a radiance source to allow for radiometric calibration of the VIIRS’s reflective solar bands (RSBs). Once on-orbit, due to solar bombardment and the space environment, the SD’s bidirectional reflectance distribution function (BRDF) changes its value. The change is denoted by a factor, known as the H-factor, that is time and wavelength dependent, as well as both incident and out-going angle dependent. Here, we use regular on-orbit solar diffuser stability monitor (SDSM) data to determine the solar angular dependence for the H-factor along the SD-to-SDSM direction. We compare the dependence with that for the VIIRS on the Suomi National Polar-orbiting Partnership satellite and apply the dependence ratio to obtain the N20 VIIRS SD H-factor along the SD-telescope direction.

Conference Presentation

Citation Download Citation

Ning Lei and Xiaoxiong Xiong "Determination of the solar angular dependence of the NOAA-20 VIIRS solar diffuser BRDF change factor", Proc. SPIE 11127, Earth Observing Systems XXIV, 111271Q (9 September 2019); https://doi.org/10.1117/12.2529783

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