GIS Spatial Interpolation Methods And Application Research

Usually we needed the regular data in the geography research, but the most data we acquired is scatter ones. Usually can apply the GIS spatial interpolation methods convert scatter data to regular.This paper introduced the model of GIS spatial interpolation principle and classification, expatiated GIS spatial interpolation methods which is in common used, expounded their algorithms, the accuracy verify, the GIS spatial interpolation principle and process detailed. And more explain the GIS spatial interpolation algorithm realization is available. On the foundation of GIS spatial interpolation using MapXtreme secondary development control which provide the development templates, modules, tools. Programmed a system of GIS spatial interpolation using computer language C#, the main function includes Inverse Distance Weighted, Trend Interpolation, Thin-Plate Spline, and Common Kriging.Accuracy of GIS spatial interpolation is affected by the method of searching sample points, the searched sample points, the radius of searching and grid size etc... For the sake of further to analyzed and verified the GIS spatial interpolation theory, using the four kinds of GIS spatial interpolation method to calculate a piece of test area of survey data in Wulan town Etuoke banner. Discussion dissimilarity of different parameter of the model, which influence the method accuracy of GIS spatial interpolation.Via comparisons and analyses, selecting Common Kriging to interpolate the survey data of Wulan town. The sample points searching radius is 300 m, each grid node searched 6 sample points, grid size is 5×5m, the RMSE is 1.3695. Getting the elevation information of Wulan town. Combined with waters source area, consumed land, fence woodland, the scope of administration district and possibility of adjustment, ascertain the development directions of Wulan town, which development towards the sides of Dong avenue two sides in the near future; development towards west and toward the south of expanded direction moderately at middle and specified future date.