Solar reflection band site automatic calibration by the Dunhuang site automatic observation radiometric calibration operational system

Yuan Li; Zhiguo Rong; Yanqiu Li; Yong Zhang; Xiutian Ba; Yanna Zhang; Lin Chen; Lijun Zhang; Wei Wei; Ling Sun

doi:10.1117/12.2528375

9 September 2019 Solar reflection band site automatic calibration by the Dunhuang site automatic observation radiometric calibration operational system

Yuan Li, Zhiguo Rong, Yanqiu Li, Yong Zhang, Xiutian Ba, Yanna Zhang, Lin Chen, Lijun Zhang, Wei Wei, Ling Sun

Author Affiliations +

Proceedings Volume 11127, Earth Observing Systems XXIV; 111271M (2019) https://doi.org/10.1117/12.2528375
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

Solar reflection band of typical in-orbit payload was calibrated by the use of the Dunhuang site automatic observation radiometric calibration operational system (DARCOS) in 2018. Several automatic observation instruments were installed at Dunhuang site. DARCOS integrated product generation, acquisition, archiving, publishing, retrieval, downloading, user hierarchical management and performance monitoring functions together. Automatic calibration algorithm for AQUAMODIS, JPSS1VIIRS, FY2GVISSR, FY3CVIRR and FY4AAGRI were developed. How to accurately measure the surface reflectance without human intervention and correct it to the payload viewing angle is an important subject needs to be solved. A surface reflectance algorithm based on surface radiance and total sky radiation was developed. The directionality calibration was performed using the micro-facet cosine linear kernel-driven (MICOKE) BRDF model. The reflectance was corrected by the site vicarious calibration campaign on August 7-9, 2018. The site correction factor exhibits two variations rules with increasing wavelength, which corresponds to the HIM detector design. The calibration results for 5 payloads between August 13 and December 31, 2018 were analyzed. Ratio of the apparent reflectance from space and ground base was used to judging the agreement. AQUAMODIS (1.02-1.15), JPSS1VIIRS (1.07-1.15), and FY3CVIRR(1.10 to 1.19) are in good agreement with the automatic observation products of the site. FY2GVISSR (1.25) and FY4AAGRI (1.07-1.31) show differences changing by time. As an efficient independent calibration method, automatic calibration could be an effective supplement to the in-orbit calibration.

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Yuan Li, Zhiguo Rong, Yanqiu Li, Yong Zhang, Xiutian Ba, Yanna Zhang, Lin Chen, Lijun Zhang, Wei Wei, and Ling Sun "Solar reflection band site automatic calibration by the Dunhuang site automatic observation radiometric calibration operational system", Proc. SPIE 11127, Earth Observing Systems XXIV, 111271M (9 September 2019); https://doi.org/10.1117/12.2528375

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