Spatial Downscaling of GPM Annual and Monthly Precipitation Using Regression-Based Algorithms in a Mountainous Area

Table 2

Averaged accuracy for monthly precipitation and accuracy for annual precipitation of the MLR-based and GWR-based downscaling algorithms with Root Mean Square Error, Mean Absolute Error, and coefficients of determination as criteria. BRC represents before residuals correction and ARC represents after residual correction.

	Mean of monthly			Annual
	RMSE/mm	MAE/mm		RMSE/mm	MAE/mm
GPM	29.47	19.63	0.56	230.97	156.76	0.59
MLRBRC	38.20	29.72	0.21	252.46	205.85	0.45
MLRARC	28.80	20.06	0.56	214.54	151.97	0.62
GWRBRC	27.23	18.61	0.62	199.85	143.18	0.67
GWRARC	28.89	19.67	0.57	206.85	150.29	0.64