Affiliation:
1. Institute of Geospatial Information, Information Engineering University, Zhengzhou 450001, China
2. School of Geomatics, Anhui University of Science and Technology, Huainan 232001, China
Abstract
Unification of the global vertical datum has been a key problem to be solved for geodesy over a long period, and the main challenge for unifying the global vertical datum system is to determine the geopotential value W0 of the geoid and to calculate the vertical offset between the local vertical datum and the global vertical datum W0. The geopotential value W0 can be calculated using the grid mean sea surface (GMSS) data and the global geopotential model (GGM). In this study, this GMSS data was measured with adjustment methods and 24 years of merged multi-satellite altimetry data. The data of HaiYang-2A (HY-2A) and Jason-3 were first used to calculate W0. The geopotential value W0 was determined to be 62,636,856.82 m2s−2 by combining the EIGEN-6C4 (European Improved Gravity Model of the Earth by New Techniques) and the GMSS data. Then, the geopotential difference approach and geodetic boundary value problem (GBVP) approach were used to determine the vertical datum parameters in this study. To compensate for the omission error of the GGM, this study utilized the remove–compute–restore (RCR) technique and the residual terrain model (RTM)-recovered high-frequency gravity signals. Finally, as a result of the GBVP solution, the geopotential value of the Australian Height Datum (AHD) was 62,636,851.935 m2s−2, and the vertical offset of the AHD relative to the global vertical datum W0 was 0.4885 m. As a result of the geopotential difference approach, the geopotential value of the Chinese Height datum was 62636861.412 m2s−2, and the vertical offset of the Chinese Height datum was −0.4592 m.
Funder
National Natural Science Foundation of China
Subject
General Earth and Planetary Sciences
Reference44 articles.
1. Hayden, T. (2013). Geopotential of the Geoid-Based North American Vertical Datum. [Master’s Thesis, Graduate Studies, University of Calgary].
2. The role of global vertical benchmarks in global change research;Zhang;Geosci. Front.,2002
3. Height datum unification between Shenzhen and Hong Kong using the solution of the linearized fixed-gravimetric boundary value problem;Zhang;J. Geod.,2009
4. Determination of regional and global elevation datum differences;Li;J. Surv. Mapp.,2017
5. What does height really mean? Part III: Height Systems;Meyer;Surv. Land Inf. Sci.,2006