本文介绍的是在重力数据库系统中配备的一套重力各项外部改正计算的方法和程序,其中地形改正和均衡改正程序将远区改正范围划分为三个区:远一区为1或2公里至20公里,采用平面公式,高程数据网度为1公里×1公里;远二区为20公里至166.7公里,采用球面公式,高程数据网度为5′×5′;远三区为166.7公里至全球,采用球面公式旋转椭球体模型,为全球1°×1°高程数据网,各区一律用园域接口。为便于用户选择,每区备有多种方法。此外还备有高度改正,中间层改正和正常改正程序。用这个系统可以计算自由空间重力异常,布格重力异常和均衡重力异常值。 In this paper, a set of gravity correction methods and procedures for gravity correction are provided in the gravity database system. Among them, the terrain correction and equalization correction program divide the correction range of the far zone into three zones: 1 or 2 km To 20 km, the use of plane formula, the elevation of data network is 1 km × 1 km; far from the second area of ​​20 km to 166.7 km, using the spherical formula, elevation data network 5 ’× 5’; Far Three districts of 166.7 km To the world, using spherical formula spheroidal spheroid model for the global 1 ° × 1 ° elevation data network, the district all garden interface. There are several methods available for each zone for the convenience of the user. In addition, there are height correction, middle layer correction and normal correction procedures. Using this system, free space gravity anomalies, Bouguer gravity anomalies and equilibrium gravity anomalies can be calculated.