三种点雨量插值方法的比较研究

对距离反比、普通Kriging和PRISM三种常用点雨量插值算法进行了原理、适用范围和优缺点的对比分析。根据雨量站点的平面三角几何关系，提出了参证插值站点的选择方法，使得参证插值站点的选择更合理。通过具体实例指出没有最优的点雨量插值方法，应该根据站点布设、雨量资料、地理位置和服务对象等特点，选择适当的插值算法或算法组合以及参证站选取算法，才会得到较好的插值精度。

Comparison of Three Kinds of Methods for Point Precipitation Interpolation

The principle,scope of application,advantage and disadvantage of three methods of point precipitation interpolation,i.e.IDW and Kriging and PRISM,are compared in this paper.And a method for choosing different locations of rain-gauge station based on trigonometry of rain-gauge station distributing to get rational rain-gauge distribution for precipitation numerical simulation is also proposed.It is demonstrated through an actual example that it is necessary to select proper interpolation method,assembled algorithm and reference station according to the characteristic of precipitation station layout,precipitation data,geography location and purpose in order to gain high precision of interpolation.