Downscaling of Open Coarse Precipitation Data through Spatial and Statistical Analysis, Integrating NDVI, NDWI, Elevation, and Distance from Sea

Table 5

Statistical metrics calculated based on measured precipitation from independent gauge stations for three groups of models (DSC: desegregated and calibrated precipitation).

		1999	2000	2001	2002	2003	2004
	TRMM	0.98	0.95	0.89	0.98	0.76	0.84
	DSC Group 2	0.95	0.93	0.90	0.99	0.79	0.80
	DSC Group 3	0.93	0.93	0.87	0.98	0.76	0.78
	DSC Group 4	0.93	0.90	0.78	0.98	0.73	0.77
RMSE	TRMM	24.91	64.24	143.41	68.22	107.33	180.46
	DSC Group 2	31.70	65.87	123.96	26.38	115.94	167.32
	DSC Group 3	34.99	52.30	116.79	20.21	111.63	157.74
	DSC Group 4	22.87	61.79	132.92	60.36	128.79	169.96
Bias	TRMM	0.041	0.168	0.412	0.163	0.282	0.403
	DSC Group 2	−0.014	−0.013	−0.017	−0.006	−0.006	−0.021
	DSC Group 3	−0.017	−0.021	−0.018	−0.006	−0.007	−0.028
	DSC Group 4	−0.020	−0.027	0.037	0.016	0.015	0.036
MAE	TRMM	20.171	56.524	95.229	46.494	64.107	119.856
	DSC Group 2	29.589	52.798	77.099	13.488	55.079	95.926
	DSC Group 3	31.793	38.696	70.261	8.964	52.754	90.081
	DSC Group 4	20.833	50.152	79.443	35.950	56.483	97.845