中文摘要：

分析了不同重力异常精度对水准测量高差改正的影响;在此基础上采用模型改正、稀释加密重力点改正的方法,分析了广东地区二等水准测量对重力异常改正的要求。结果表明：当水准点的高程小于50 m,类似于EGM2008等地球重力场模型在广东地区能满足二等水准测量重力异常改正的精度要求;对于高程在50~100 m或高差小于50 m的区域,重力实测点间距宜小于10 km;对于高程在100~150 m或高差在50~100 m的区域,每个水准点应测定重力;当高程大于150 m或高差大于100 m的水准测段中,地面倾斜处应加测重力。

英文摘要：

This paper analyzes the influence of different gravity anomaly precision measurement on level elevation correction.Based on the analysis,we use model correction method and encryption methods gravity point dilution to analyze the request of second level measurment in Guangdong region on gravity anomaly correction. Through experiments,the results show that：when the standard point of elevation is less than 50 m,similar to Earth＇s gravity field model EGM2008 and other areas in Guangdong to meet the second leveling gravity anomaly correction accuracy;for 50-100 m elevation or height of less than 50 m regional gravity measurement point spacing should be less than 10 km;100-150 m for elevation or height of 50-100 m in the area,should be determined for each standard point of gravity;when elevation is greater than 150 m or 100 m height than the standard test section,tilt at ground gravity survey should be added.