23 September 2013 Assessment of the MODIS RSB detector differences using earth-view targets
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Abstract
MODIS has 20 reflective solar bands (RSB) with a total of 330 individual detectors. Currently, there are two nearly identical MODIS instruments operating in space: one on the Terra spacecraft launched in December 1999 and another on the Aqua spacecraft launched in May 2002. MODIS reflective solar bands (RSB) are calibrated on-orbit by a system that consists of a solar diffuser (SD) and a solar diffuser stability monitor (SDSM). Near-monthly lunar observations are also used to track the sensor response versus scan angle (RVS) change on-orbit. On-orbit observations show that the changes in the detector response are wavelength, scan-angle and mirror side dependent. This paper provides a comprehensive assessment of the detector-to-detector calibration differences in the MODIS VIS/NISR spectral bands using the on-board calibrators and earth-view (EV) level 1B (L1B) data products. Different EV targets are analyzed to accommodate the high-gain ocean bands which tend to saturate over land surfaces. The results from this study highlight the necessity of the constant monitoring of the detector-level gain and its change as a function of scan-angle, as implemented in the MODIS Collection 6 (C6) products.
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Amit Angal, Amit Angal, Junqiang Sun, Junqiang Sun, Xu Geng, Xu Geng, Mike Chu, Mike Chu, Xiaoxiong Xiong, Xiaoxiong Xiong, } "Assessment of the MODIS RSB detector differences using earth-view targets", Proc. SPIE 8866, Earth Observing Systems XVIII, 88661T (23 September 2013); doi: 10.1117/12.2023636; https://doi.org/10.1117/12.2023636
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