几种地形校正方法的研究

本文推证了三种典型的地形校正方法(局部地形改正(C),剩余地形改正(RTM)爱黎-海斯卡宁型地形均衡改正(t_C)之间的数学关系,对其特性进行了分析比较;讨论了它们实现的途径(数据处理方法)及其计算特征;最后还应用某地区的实测地形高数据进行了实际计算,得出了一些有益的结论。

A Study of Some Terrain Reduction Methods

The paper has evaluated the relationships among three terrain reduction procedures(terrain correction,isostatic reduction,residual terrain reduction(RTM) and given the methods of their data processing.The emphasis has been laid to speed the computation and deal with the singular integration properly.Our major conclusions are as follows:——To the near zone of the computated point,or the'innermost zone',the terrain heights have a critical effect on the terrain reduction results,and the discrete integration need to be done particularly.The(terrain) height data in the innermost zone must be densified to decrease discrete error,the best method is bicubic spline function.——It is necessary to obtain detailed terrain height data in the innermost zone.(generally speaking,within 10~50km radius is enough).——It is highly important to consider the speed of computation.If there are many terain reduction points to be computated and the points are regular arranged,FFT algorithm is effective to save computer time.