Typhoon Maria Precipitation Retrieval and Evolution Based on the Infrared Brightness Temperature of the Feng-Yun 4A/Advanced Geosynchronous Radiation Imager

Table 1

Comparison of AGRI retrieval precipitation and GPM during Typhoon Maria.

	SSIM SLLE/SLLE + FCM	NMI SLLE/SLLE + FCM	PSNR SLLE/SLLE + FCM	POD (%) SLLE/SLLE + FCM	FAR (%) SLLE/SLLE + FCM	CSI (%) SLLE/SLLE + FCM
2018071004	0.902/0.881	0.355/0.171	28.385/26.734	99.38/99.62	1.17/1.61	98.22/98.02
2018071006	0.888/0.857	0.338/0.133	27.606/24.847	99.31/99.54	1.23/1.7	98.09/97.86
2018071008	0.892/0.863	0.299/0.121	27.875/22.649	99.54/99.69	0.81/1.11	98.74/98.58
2018071012	0.957/0.937	0.272/0.165	31.813/30.428	99.86/99.90	0.35/0.46	99.51/99.44
2018071016	0.957/0.941	0.222/0.139	31.693/30.476	99.95/99.97	0.38/0.47	99.57/99.49
2018071018	0.965/0.946	0.276/0.170	33.142/32.590	99.98/99.98	0.39/0.43	99.60/99.55

Note. The SSIM unit is dimensionless. The larger the SSIM, the more similar the 2 comparison objects. When the SSIM is 1, the 2 comparison objects are the same. The unit of NMI is mm, and the unit of PSNR is dB. The larger the PSNR value is, the less distortion there is between the retrieval field and the actual GPM field. Precipitation thresholds in POD, FAR, and CSI were all set to 5.0 mm/h.