Hydrological impacts of precipitation extremes in the Huaihe River Basin, China

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Table 2 Selected spatial interpolation methods for precipitation indices based on the mean square error (MSE) evaluation results (IDW inverse distance weighting)

Index	MSE	CDD	CWD	PRCPprb	PRCPtot	R95p	RX1 day	RX5 day	SDII
Value	Method	Kriging	Kriging	Kriging	Kriging	Kriging	Kriging	Kriging	Kriging
	MSE	1.58	0.21	0.0067	41.98	15.66	5.67	7.70	0.37
	Method	IDW	IDW	IDW	IDW	IDW	IDW	IDW	IDW
	MSE	2.06	0.25	0.0093	39.88	16.43	4.76	7.87	0.45
	Method	Spline	Spline	Spline	Spline	Spline	Spline	Spline	Spline
	MSE	2.52	0.27	0.0118	51.80	14.66	4.66	5.78	0.33
	Selected methods	Kriging	Kriging	Kriging	IDW	Spline	Spline	Spline	Spline
Anomaly	Method	Kriging	Kriging	Kriging	Kriging	Kriging	Kriging	Kriging	Kriging
	MSE	2.53	0.40	0.0041	47.80	33.84	11.87	23.80	0.52
	Method	IDW	IDW	IDW	IDW	IDW	IDW	IDW	IDW
	MSE	1.87	0.37	0.0046	46.79	38.92	9.57	25.47	0.50
	Method	Spline	Spline	Spline	Spline	Spline	Spline	Spline	Spline
	MSE	1.83	0.27	0.0077	38.79	33.12	9.03	23.17	0.48
	Selected methods	Spline	Spline	Kriging	Spline	Spline	Spline	Spline	Spline