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Proceedings Paper

The solar vector error within the SNPP Common GEO code, the correction, and the effects on the VIIRS SDR RSB calibration
Author(s): Jon Fulbright; Samuel Anderson; Ning Lei; Boryana Efremova; Zhipeng Wang; Jeffrey McIntire; Kwofu Chiang; Xiaoxiong Xiong
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Paper 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.

Paper Details

Date Published: 19 November 2014
PDF: 10 pages
Proc. SPIE 9264, Earth Observing Missions and Sensors: Development, Implementation, and Characterization III, 92641T (19 November 2014); doi: 10.1117/12.2074598
Show Author Affiliations
Jon Fulbright, Sigma Space Corp. (United States)
Samuel Anderson, Sigma Space Corp. (United States)
Ning Lei, Sigma Space Corp. (United States)
Boryana Efremova, Sigma Space Corp. (United States)
Zhipeng Wang, Sigma Space Corp. (United States)
Jeffrey McIntire, Sigma Space Corp. (United States)
Kwofu Chiang, Sigma Space Corp. (United States)
Xiaoxiong Xiong, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 9264:
Earth Observing Missions and Sensors: Development, Implementation, and Characterization III
Xiaoxiong Xiong; Haruhisa Shimoda, Editor(s)

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