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23 September 2013 Assessment of the MODIS RSB detector differences using earth-view targets
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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.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Amit Angal, Junqiang Sun, Xu Geng, Mike Chu, and Xiaoxiong Xiong "Assessment of the MODIS RSB detector differences using earth-view targets", Proc. SPIE 8866, Earth Observing Systems XVIII, 88661T (23 September 2013);


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