Estimation of the height datum geopotential value of Hong Kong using the combined Global Geopotential Models and GNSS/levelling data

被引：6

作者：

Zhang, Panpan ^{[1
,2
]}

Bao, Lifeng ^{[1
,2
]}

Guo, Dongmei ^{[1
,2
]}

Li, Qianqian ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Innovat Acad Precis Measurement Sci & Technol, State Key Lab Geodesy & Earths Dynam, Wuhan 430077, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

SURVEY REVIEW | 2022年 / 54卷 / 383期

基金：

中国国家自然科学基金;

关键词：

Grace; Goce; The combined GGMS; Residual terrain model; Hong Kong principal datum; Geopotential value;

D O I：

10.1080/00396265.2021.1884794

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The advent of the Gravity Recovery and Climate Experiment (GRACE) and Gravity field and steady-state Ocean Circulation Exploration (GOCE) has changed the global contribution in the determination of high-accuracy global geopotential models (GGMs). In this paper, a spectral expansion method is used to determine the combined GGMs, using the high-resolution EGM2008 model and residual terrain model (RTM) to effectively bridge the spectral gap between the satellite and terrestrial data. The accuracy of the combined GGMs shows improvement compared with GOCE/GRACE-based GGMs and EGM2008 in determining the geopotential of the Hong Kong Principal Datum (HKPD). As a result of the DIR_R5/EGM2008/RTM model and GNSS/levelling, the geopotential value of HKPD is estimated to be 62,636,860.52 m(2)s(-2) with respect to the global geoid W (0) = 62,636,853.4 m(2)s(-2). Therefore, the vertical offset between the HKPD and global geoid is about -72.8 cm, which means that the HKPD is 72.8 cm below the global height datum.

引用

页码：106 / 116

页数：11