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Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS
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...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7962088/ https://www.ncbi.nlm.nih.gov/pubmed/33799978 http://dx.doi.org/10.3390/s21051859 |
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author | Zhong, Bo Ma, Yingbo Yang, Aixia Wu, Junjun |
author_facet | Zhong, Bo Ma, Yingbo Yang, Aixia Wu, Junjun |
author_sort | Zhong, Bo |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-7962088 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-79620882021-03-17 Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS Zhong, Bo Ma, Yingbo Yang, Aixia Wu, Junjun Sensors (Basel) Brief Report 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. MDPI 2021-03-07 /pmc/articles/PMC7962088/ /pubmed/33799978 http://dx.doi.org/10.3390/s21051859 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Brief Report Zhong, Bo Ma, Yingbo Yang, Aixia Wu, Junjun Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS |
title | Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS |
title_full | Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS |
title_fullStr | Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS |
title_full_unstemmed | Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS |
title_short | Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS |
title_sort | radiometric performance evaluation of fy-4a/agri based on aqua/modis |
topic | Brief Report |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7962088/ https://www.ncbi.nlm.nih.gov/pubmed/33799978 http://dx.doi.org/10.3390/s21051859 |
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