反距离加权网格化插值算法的改进及比较

在地球物理数据处理等很多方面都涉及到等值线图的绘制。绘制等值线图时，首先需要对离散数据进行网格化插值处理。其中，反距离加权网格化插值算法简单、容易实现，但是该算法有计算效率低等缺点。本文采用窗口法对反距离加权网格化插值算法进行改进，并通过实例对正方形窗口和圆形窗口进行了分析和比较。结果表明，用窗口法对反距离加权网格化插值算法进行改进可以提高该算法的效率，并且圆形窗口比正方形窗口相对较好。

Improvement and Comparison of Inverse Distance Weighted Grid Interpolation Algorithm

The contour line mapping is related to many fields such as geophysical data pro- cessing etc. The grid interpolation of discrete data is needed when drawing the contour line. The inverse distance weighted grid interpolation algorithm is simple and easy to imple ment, but the computational efficiency is low. In this paper, firstly, the inverse distance weighted grid interpolation algorithm is improved with the window method. Then, the square window and circular window are analyzed and compared through examples. The re- sult shows that the inverse distance weighted grid interpolation algorithm with window method can improve the efficiency of the algorithm, and the circular window is better than the square window.