似大地水准面与大地水准面转换分析  

Analysis of Geoid-Quasigeoid Separation

作　　者：赵辉 王斌 王文超 王夏莉 耿晓燕 ZHAO Hui;WANG Bin;WANG Wenchao;WANG Xiali;GENG Xiaoyan(Geodetic Data Processing Center,MNR,Xi’an 710054,China)

机构地区：[1]自然资源部大地测量数据处理中心,西安市710054

出　　处：《大地测量与地球动力学》2024年第8期853-856,共4页Journal of Geodesy and Geodynamics

基　　金：陕西测绘地理信息局科技创新项目(SCK2022-03)。

摘　　要：传统的似大地水准面与大地水准面近似转换在地形复杂的山区难以满足精度需求。本文基于似大地水准面与大地水准面严密转换方法,计算珠峰地区转换改正数值大小,分析似大地水准面与大地水准面转换的空间变化。结果表明,严密方法计算的转换值变化范围为-3.270~-0.119 m,其中地形位差改正极值达到1.272 m,重力梯度改正极值达到-0.138 m,这两项改正影响幅度较大,在山区需顾及;严密方法计算和近似计算结果都与地形高度具有一定的相关性,但前者结果相较于后者更为平滑,在布格重力异常与地形变化的共同影响下,严密方法局部特征与地形高度负相关。The traditional method of geoid-quasigeoid separation is difficult to meet the accuracy requirements in mountainous regions with complex terrain.We use a strict formula to calculate the geoid-quasigeoid separation in the mount Qomolangma area and analyze spatial changes.The results show that the total correction using the strict formula varies from-3.270 m to-0.119 m,the potential correction reaches 1.272 m,and the gravity gradient correction reaches-0.138 m.The magnitude of these corrections is large enough and needs to be taken into account in mountainous areas.The strict method and the approximate method both have a certain correlation with height,and the former produces smoother results than the latter.Under the influence of Bouguer gravity anomaly and terrain changes,some local features of strict method are negatively correlated with height.

关 键 词：似大地水准面 大地水准面 布格重力异常 地形位差改正 重力梯度改正 

分 类 号：P223[天文地球—大地测量学与测量工程]