区域重力调查成果在江苏地区高精度水准测量改正中的适用性分析

本文分析了空间重力异常精度对水准测量高差重力异常改正的影响。在江苏两处试验区分别采用实测重力和布格异常数据库两种改正方法，计算测段重力异常改正值，对比两者间的差异。结果表明：未顾及地形起伏的实测重力点分布是导致两种改正方法改正值差异大的主要因素；地形起伏较大区域，水准线路出现转折或倾斜过大时，需加测重力，采用实测重力进行水准测量高差重力异常改正；平坦小区域内，利用布格异常数据库与实测重力进行水准测量高差重力异常改正的精度相当。

Analysis of the applicability of the regional gravity data to high-precision leveling correction in Jiangsu area

In this paper, the influence of different spatial gravity anomaly accuracy on the correction of gravity anomaly in leveling is analyzed. Two correction methods of measured gravity and Bouguer anomaly database are used to calculate the correction values of gravity anomalies in two test areas in Jiangsu province, and the differences between the two correction values are compared. The results show that the measured distribution of gravity points without regard to topographic relief is the main factor that causes the difference between the two correction methods. In the area with large topographic relief, if the leveling line turns or tilts too much, the gravity of measuring point should be added, and the measured gravity should be used to correct the gravity anomaly of leveling height difference. The accuracy of Bouguer anomaly database and gravity leveling is similar in small flat area.