基于GIS辽宁省降水资源分析

Study on the method of precipitation interpolation in Liaoning province

利用辽宁省284个气象站点1956-2005年50年的年、季均降水量数据,采用ordinaryKriging、IDW、Spline和Trend四种常用的空间插值方法对辽宁省季、年均降水量的空间分布插值效果进行对比分析。结果表明:IDW法对春季、夏季和年的插值效果较好,Spline法对秋季和冬季插值效果较好。辽宁省降水量空间分布为东南多,西北少,整体呈现自东南向西北减少的趋势。

Taking 50 years precipitation data in the annual and seasonal from 1956 to 2005 of 284 climate station in Liaoning province, the interpolation effect of the space methods of ordinary Kriging, IDW, Spline, and Trend were analyzed and compare the results. The result show that： IDW method is good for spring,summer and annual rainfall, Spline method is good for autumn and winter rainfall. The spatial distribution of precipitation in Liaoning province is southeast more than northwest, seasonal and annual precipitation are decreasing from southeast to northwest.