Spatiotemporal Variation Characteristics of Vegetative PUE in China from 2000 to 2015

Table 1

Accuracy comparison of the five interpolation methods.

Interpolation method	Maximum (mm)	Minimum (mm)	Mean (mm)	Standard deviation (mm)	t-test
IDW	2686.0908	15.8132	567.8891	474.8156	0.2500	0.8043
Spline	8519.6455	−2830.9712	560.7704	487.1202	0.0273	0.9784
Trend	4136.6260	114.0831	577.2636	448.7920	0.3870	0.7014
Ordinary kriging	2613.2412	−28.6841	559.9145	476.0661	0.3520	0.7273
Universal kriging	2201.4834	−932.9639	560.7932	472.1631	0.2088	0.8360