Estimation and Correction of Geolocation Errors in FengYun-3C Microwave Radiation Imager Data


Microwave Radiation Imager (MWRI) onboard the FengYun (FY)-3C satellite provides measurements of the Earth's atmosphere and surface at ten.sixty five, eighteen.7, twenty three.8, thirty six.five, and eighty nine.0 GHz with dual polarization. While FY MWRI knowledge are widely distributed to the user community, their geolocation accuracy has not been documented. During this paper, the coastline inflection method is used to estimate MWRI geolocation errors. 3 coastal regions where MWRI brightness temperature exhibits a massive contrast are selected for the geolocation analysis. A total of 720 MWRI information points are identified that cross the coastlines. The latitudes and longitudes at these information points are compared with the fine-resolution database of the world Self-consistent, Hierarchical, High-resolution Shoreline (GSHHS). It's found that the mean geolocation errors in along- and cross-track directions are approximately 5–6 km at eighty nine GHz. This magnitude of errors is additional than thirty% of the field-of-read size at 89 GHz. Such a geolocation error must be corrected thus that the MWRI data can be additional helpful for quantitative remote sensing. So, the mean geolocation errors are more utilized to regulate the satellite perspective angles (e.g., pitch, roll, and raw). When the angle angle correction, the MWRI geolocation is terribly accurate at eighty nine GHz, and errors in different MWRI channels could be corrected through their co-registration relationships to the eighty nine-GHz channel.

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