Application of PRISM Spatial Interpolation to the Precipitation Distribution in the Songhuajiang River Basin

Based on the DEM data of 1 km×1 km and the precipitation data of 46 base stations in the Songhuajiang River basin,the interpolation of the annual rainfall of 2000—2004 is performed in the paper using the parameter-elevation regression on independent slopes model(PRISM) methed,which mainly takes into account the weight of the distance between raster points and base stations and of the elevation changes from raster points to base stations.The spatial distribution of the annual precitation containing geographical information is output by Arcinfo at a high resolution,and cross-validation errors of the stations are small.