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Proceedings Paper

MODIS reflective solar bands calibration improvements in Collection 6
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Paper Abstract

Since launch, Terra and Aqua MODIS have performed more than 12 and 10 years of scientific measurements of the Earth’s surface. MODIS has 36 spectral bands, among which 20 are Reflective Solar Bands (RSB), covering a spectral range from 0.41 μm to 2.1 μm. MODIS was developed with stringent requirements for calibration and uncertainty and is equipped with a set of on-board calibrators (OBC) that facilitate a constant monitoring and update of its on-orbit calibration coefficients. The RSB are calibrated on-orbit using a Solar Diffuser (SD) and a Solar Diffuser Stability Monitor (SDSM), with help from the lunar observations via a Space View (SV) port and an onboard Spectroradiometric Calibration Assembly (SRCA). The algorithms to accurately characterize the sensor’s gain change and the on-orbit change in the response versus scan-angle (RVS) have been applied to improve the quality of the Earth-view measurements. Various improvements to the calibration algorithms have been incorporated since launch and the following paper will discuss the calibration algorithms and enhancements developed for MODIS Collection 6 (C6) processing. In addition, to supplement the measurements from the on-board calibrators, pseudo-invariant desert targets are also used to track the on-orbit response change for selective RSB. Discussions of the on-orbit calibration uncertainty and the Level 1B (L1B) Uncertainty index (UI) product are also included. A comprehensive assessment of the impact on the L1B product in comparison to Collection 5 (C5) is also discussed. Significant improvements are observed in the case of VIS bands wherein the long-term bias observed in C5 products is eliminated to provide a more accurate radiometric product.

Paper Details

Date Published: 28 November 2012
PDF: 10 pages
Proc. SPIE 8528, Earth Observing Missions and Sensors: Development, Implementation, and Characterization II, 85280N (28 November 2012); doi: 10.1117/12.979733
Show Author Affiliations
Junqiang Sun, Sigma Space Corp. (United States)
Amit Angal, Science Systems and Applications, Inc. (United States)
Xiaoxiong Xiong, NASA Goddard Space Flight Ctr. (United States)
Hongda Chen, Sigma Space Corp. (United States)
Xu Geng, Sigma Space Corp. (United States)
Aisheng Wu, Sigma Space Corp. (United States)
Taeyoung Choi, Sigma Space Corp. (United States)
Mike Chu, Sigma Space Corp. (United States)

Published in SPIE Proceedings Vol. 8528:
Earth Observing Missions and Sensors: Development, Implementation, and Characterization II
Haruhisa Shimoda; Xiaoxiong Xiong; Changyong Cao; Xingfa Gu; Choen Kim; A. S. Kiran Kumar, Editor(s)

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