FY-4A DISK Observation Parameters Geometric Correction Reprocessing Dataset (2021)

LI Shuang1,2YAO Jing1,2ZHU Yunqiang*3

1 Guizhou Provincial Key Laboratory of Geographic State Monitoring of Wa-tershed，Guizhou Education University，Guiyang 550018，China2 Institute of Guizhou Mountain，Guizhou Education University，Guiyang 550018，China3 Institute of Geographic Sciences and Natural Resources Research，Chinese Academy of Sciences，Beijing 100101，China

DOI:10.3974/geodb.2022.03.10.V1

Published:Mar. 2022

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Key Words：

meteorological satellite,FY-4,AGRI,DISK,observation parameters

Abstract：

FY-4A meteorological satellite, the first one of China’s new generation geosynchronous meteorological satellites, is located at an altitude of approximately 36,000 km directly over the equator (0°, 104.7°E). Region DISK covers an rectangle area (60°S-60°N，44°E-164°E). Geometric quality of FY-4A imagery is significantly improved, when compared to that of its predecessor, due to the three-axis stabilization system. However, there are still random affine drifts in x and y directions, which sometimes cause geometric errors up to 4 pixels. The FY-4A DISK Observation Parameters Geometric Correction Reprocessing Dataset (2021) has been carefully generated according to satellite ephemeris data, parameters of AGRI projection and high quality DEM. This product includes georeferenced pixel-wise satellite azimuth angle (NOMSatelliteAzimuth), satellite zenith angle (NOMSatelliteZenith), solar azimuth angle (NOMSunAzimuth), and solar zenith angle (NOMSunZenith) and solar glint angle (NOMSunGlintAngle). The acquisition frequency of FY4Land-GEO is 30 minutes interval. There are 40 NetCDF files (around 910 MB) for a day and night (compressed into 2 .zip files with 910 MB). Then, there are 730 data files (around 325 GB) total in 2021. The file name of the dataset is identified as satellite, sensor, coverage, satellite location, acquisition time, spatial resolution, and product code, such as: FY4A-_AGRI--_N_DISK_1047E_20210101070000_4000M_GEO.nc. Where: FY-4A for satellite (Fengyun 4 A Satellite); AGRI for Sensor (Advanced Geostationary Radiation Imager); N_DISK for region (60°S-60°N, 44°E-164°E); Longitude of the satellite sub-point (“1047E”=104.7°E) follows; then acquisition time (YYYYMMDDhhmmss); pixel resolution (4000 m); observation parameters (GEO) and data format (.nc).

Foundation Item：

Chinese Academy of Sciences (XDA23100100)；

Data Citation：

LI Shuang, YAO Jing, ZHU Yunqiang*. FY-4A DISK Observation Parameters Geometric Correction Reprocessing Dataset (2021)[J/DB/OL]. Digital Journal of Global Change Data Repository, 2022. https://doi.org/10.3974/geodb.2022.03.10.V1.

Data Product: