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19 November 2014 The solar vector error within the SNPP Common GEO code, the correction, and the effects on the VIIRS SDR RSB calibration
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Abstract
Due to a software error, the solar and lunar vectors reported in the on-board calibrator intermediate product (OBC-IP) files for SNPP VIIRS are incorrect. The magnitude of the error is about 0.2 degree, and the magnitude is increasing by about 0.01 degree per year. This error, although small, has an effect on the radiometric calibration of the reflective solar bands (RSB) because accurate solar angles are required for calculating the screen transmission functions and for calculating the illumination of the Solar Diffuser panel. In this paper, we describe the error in the Common GEO code, and how it may be fixed. We present evidence for the error from within the OBC-IP data. We also describe the effects of the solar vector error on the RSB calibration and the Sensor Data Record (SDR). In order to perform this evaluation, we have reanalyzed the yaw-maneuver data to compute the vignetting functions required for the on-orbit SD RSB radiometric calibration. After the reanalysis, we find effect of up to 0.5% on the shortwave infrared (SWIR) RSB calibration.
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Jon Fulbright, Samuel Anderson, Ning Lei, Boryana Efremova, Zhipeng Wang, Jeffrey McIntire, Kwofu Chiang, and Xiaoxiong Xiong "The solar vector error within the SNPP Common GEO code, the correction, and the effects on the VIIRS SDR RSB calibration", Proc. SPIE 9264, Earth Observing Missions and Sensors: Development, Implementation, and Characterization III, 92641T (19 November 2014); doi: 10.1117/12.2074598; https://doi.org/10.1117/12.2074598
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