Gerhard Meister,1 Frederick S. Patt,2 Xiaoxiong Xiong,3 Junqiang Sun,4 Xiaobo Xie,4 Charles R. McClain5
1Futuretech Corp. (United States) 2SAIC, NASA Goddard Space Flight Ctr. (United States) 3NASA/GSFC (United States) 4Science Systems and Applications Inc. (United States) 5NASA Goddard Space Flight Ctr. (United States)
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The Moderate Resolution Imaging Spectroradiometer (MODIS) on the
Earth Observing System (EOS) Aqua platform uses biweekly solar diffuser measurements for the radiometric calibration of the ocean
color bands. The solar angle relative to the spacecraft changes
throughout the year. This document describes correlations in the solar diffuser measurements of the ocean color bands to the sun yaw angle. The functional form of the correlations depends on the position of the respective band and detector on the focal plane. The proposed corrections often exceed 0.5% (peak-to-peak). The most likely source of the correlations is the radiometric characterization of the solar diffuser screen. These results show the importance of a complete prelaunch characterization for spaceborne sensors regarding the radiometric calibration.
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Gerhard Meister, Frederick S. Patt, Xiaoxiong Xiong, Junqiang Sun, Xiaobo Xie, Charles R. McClain, "Residual correlations in the solar diffuser measurements of the MODIS Aqua ocean color bands to the sun yaw angle," Proc. SPIE 5882, Earth Observing Systems X, 58820V (22 August 2005); https://doi.org/10.1117/12.620094