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地形改正的方法和精度一直是重力测量外部改正的重点，矛盾的焦点又在于测地资料的精度。对目前各省相继开展的以1∶20万为主的区域重力测量工作而言，最大的困难往往是缺乏足够精度的大、中比例尺（1∶1万～1∶2.5万）地形图。由于区域重力观测点分布稀疏和不规则性，又导致无法直接引用目前已经采用的大比例尺规则测网的电算地改方法。因此，不规则测网的地形改正方法已成为人们广为关注且急待解决的问题。
The method and accuracy of topographic correction have always been the focus of external corrections in gravity measurements, and the focus of contradictions lies in the accuracy of geodetic data. For the current 1: 200,000-area regional gravimetry work carried out successively by various provinces, the biggest difficulty is often the lack of sufficient accuracy of large and medium scales (1: 10,000 to 1: 25,000) topographic maps. Due to the sparseness and irregularity of regional gravity observation points, it is not possible to directly refer to the computerized land remediation method that has been adopted to measure the network by the large-scale rule. Therefore, the method of topographic correction of irregular network has become a problem that people pay more attention to and urgently need to solve.