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On-orbit polarization sensitivity evaluation of FY-3B MERSI
Author(s): Ling Sun; Lei Gao; Danyang Cao; Ran Huo
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Paper Abstract

Medium Resolution Spectral Imager (MERSI) onboard FY-3 was a MODIS-like sensor which was designed for application in land, ocean and atmosphere. However, the prelaunch characterization of MERSI was not sufficient. The polarization property was not measured, which would influence the accuracy of sensor radiometric measurement, especially at scan edges. To evaluate the polarization sensitivity after launch, an ocean target based method was presented to model the Stokes vector entering the sensor at the top of atmosphere, and the on-orbit polarization response coefficients were estimated by regression between the modeled and measured radiance. After testing with Aqua MODIS, the method was applied to FY-3B MERSI. It revealed that there was relatively large polarization sensitivity for FY-3B MERSI visible bands. For the most sensitive band at 412nm, the polarization factor is approximately twice of that for Aqua MODIS. The mean polarization factors are above 3% for blue bands. For 412-nm band, the TOA polarization correction range is 16% for FY-3B MERSI, while 7% for Aqua MODIS on the same day.

Paper Details

Date Published: 25 May 2018
PDF: 10 pages
Proc. SPIE 10631, Ocean Sensing and Monitoring X, 1063116 (25 May 2018); doi: 10.1117/12.2311439
Show Author Affiliations
Ling Sun, National Satellite Meteorological Ctr. (China)
Lei Gao, North China Univ. of Technology (China)
Danyang Cao, North China Univ. of Technology (China)
Ran Huo, North China Univ. of Technology (China)


Published in SPIE Proceedings Vol. 10631:
Ocean Sensing and Monitoring X
Weilin "Will" Hou; Robert A. Arnone, Editor(s)

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