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Brief Report

Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS

by 1,2, 1,2, 2,* and 2
1
College of Computer Science and Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2
State Key Laboratory of Remote Sensing Science, Aerospace information Research Institute, Chinese Academy of Sciences, Beijing 100101, China
*
Author to whom correspondence should be addressed.
Sensors 2021, 21(5), 1859; https://doi.org/10.3390/s21051859
Received: 29 January 2021 / Revised: 28 February 2021 / Accepted: 3 March 2021 / Published: 7 March 2021
(This article belongs to the Section Remote Sensors)
Fengyun-4A (FY-4A) is the first satellite of the Chinese second-generation geostationary orbit meteorological satellites (FY-4). The Advanced Geostationary Radiation Imager (AGRI), onboard FY-4A does not load with high-precision calibration facility in visible and near infrared (VNIR) channel. As a consequence, it is necessary to comprehensively evaluate its radiometric performance and quantitatively describe the attenuation while using its VNIR data. In this paper, the radiometric performance at VNIR channels of FY-4A/AGRI is evaluated based on Aqua/MODIS data using the deep convective cloud (DCC) target. In order to reduce the influence of view angle and spectral response difference, the bi-directional reflectance distribution function (BRDF) correction and spectral matching have been performed. The evaluation result shows the radiometric performance of FY-4A/AGRI: (1) is less stable and with obvious fluctuations; (2) has a lower radiation level because of 24.99% lower compared with Aqua/MODIS; 3) has a high attenuation with 9.11% total attenuation over 2 years and 4.0% average annual attenuation rate. After the evaluation, relative radiometric normalization between AGRI and MODIS in VNIR channel is performed and the procedure is proved effective. This paper proposed a more reliable reference for the quantitative applications of FY-4A data. View Full-Text
Keywords: FY-4A/AGRI; VNIR; DCC; radiometric performance; Aqua/MODIS FY-4A/AGRI; VNIR; DCC; radiometric performance; Aqua/MODIS
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MDPI and ACS Style

Zhong, B.; Ma, Y.; Yang, A.; Wu, J. Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS. Sensors 2021, 21, 1859. https://doi.org/10.3390/s21051859

AMA Style

Zhong B, Ma Y, Yang A, Wu J. Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS. Sensors. 2021; 21(5):1859. https://doi.org/10.3390/s21051859

Chicago/Turabian Style

Zhong, Bo, Yingbo Ma, Aixia Yang, and Junjun Wu. 2021. "Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS" Sensors 21, no. 5: 1859. https://doi.org/10.3390/s21051859

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