河南省安阳县三种土壤全氮含量空间插值方法的比较分析

Comparison of Spatial Interpolation For Soil Total Nitrogen in Anyang Country of Henan Province

采用反距离加权法(IDW),克里格法(Kriging),径向基函数法(Spline)对河南省安阳县385个土壤样点的全氮进行空间插值,通过交叉验证和样点检验对不同空间插值方法进行分析,结果表明,Spline优于IDW和Kriging,并且不同插值方法有不同的最优插值点数;基于不同样条函数的径向基函数法插值结果的平均相对误差MRE不同,其中平面样条函数表现最差,高次曲面函数,张力样条函数、规则样条函数和反高次曲面函数之间差异不显著。检验分析结果也显示,Spline优于IDW和Kriging,因此,相对于IDW和Kriging,Spline更适合用于全氮的空间插值。

soil nitrogen value of 386 samples in anyang country of Henan Province was interpolated in space through three methods, the distance of the weighted method （IDW）, ordinary Kriging（Kriging ）, radical basic functions（Spline）. The preeisions of different interpolation methods were analyzed by cross validation and validation. The verification result showed Spline was better than IDW and Kriging, and the different methods had the different and optimal points interpolated. Radical basic functions based on different Spline methods had the different MRE of interpolation results., thin-plate Spline was worst, and there was no obvious difference among multiquadric, Spline with tension, completely regularizedSspline and inverse muhiquadric functions. The validation analysis showed that MRE of Spline was better than IDW and Kriging. So Spline was fitter for spatial interpolation for soil nitrogen than IDW and Kriging.