离散重力数据等值线生成算法

网格化是等值线图生成算法中的主要步骤,使用Shepard曲面拟合法、加权趋势面拟合法及普通克里金算法对重力异常数据网格化,从计算速度、网格化后数据连续性、网格化结果精度、网格化运算时间等方面对三种方法比较分析,普通克里金法拥有较好计算精度和图形连续性,但是计算时间最长,Shepard法计算精度不错、时间短,只是生成图形连续性差,趋势面法计算时间长、结果精度低,不是一种很适用的方法。

Algorithm for Drawing Discrete Gravity Data's Contour Chart

Gridding was one important step in drawing contour chart. Gravity anomaly data were interpolated for gridding by using Shepard surface fitting method, Weight trend surface fitting method and Ordinary Kriging method, then this paper compared and analyzed the gridding results through three ways： continuity of gridded surface, the accuracy of results and the calculating speed ： Ordinary Kriging method had the best interpolation precision and the nice continuity of gridded results, but calculating speed was slow; The Shepard method own good precision, and calculating speed was fast, however, the continuity is not very well; The trend surface fitting method was not a suitable method for its slow speed and low precision.