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7 September 2018 Assessment of the on-orbit MODIS SRCA spectral uncertainty
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The Moderate Resolution Imaging Spectroradiometer (MODIS) instruments on board the Terra and Aqua space- craft are equipped with several on-board calibrators (OBCs) and continue to operate normally since launch. One such calibrator is the Spectro-Radiometric Calibration Assembly (SRCA), whose regular calibrations provide accurate measurements in radiometric, spatial and spectral modes. The SRCA is able to monitor and measure the center wavelength (CW) shift, the bandwidth (BW) shift and a major portion of the relative spectral response (RSR) for each of the MODIS reflective solar bands (RSBs) while operating in spectral mode. However, there are several factors that influence the uncertainties when calculating these results. This paper provides a brief overview of the SRCA in spectral mode, along with how the CWs, BWs and RSRs of the MODIS RSBs are calculated. The operational factors that contribute to the spectral uncertainty are also discussed, including the variation of the half-included angle (β) and the grating motor offset angle (θoff ) of the monochromator. A comparison between the theoretical and on-board CW uncertainty is also provided.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Emily J. Aldoretta, Daniel Link, Kevin A. Twedt, and Xiaoxiong Xiong "Assessment of the on-orbit MODIS SRCA spectral uncertainty", Proc. SPIE 10764, Earth Observing Systems XXIII, 1076412 (7 September 2018);

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