To Evaluate Earth Gravitational Model Using Equigeopotential Character

DING Jian; XU Houze; ZHANG Chuanyin

doi:10.13203/j.whugis20160050

Volume 43 Issue 6

Jun. 2018

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Geomatics and Information Science of Wuhan University > 2018 > 43(6): 832-839. > DOI: 10.13203/j.whugis20160050

DING Jian, XU Houze, ZHANG Chuanyin. To Evaluate Earth Gravitational Model Using Equigeopotential Character[J]. Geomatics and Information Science of Wuhan University, 2018, 43(6): 832-839. DOI: 10.13203/j.whugis20160050

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To Evaluate Earth Gravitational Model Using Equigeopotential Character

DING Jian^{1, 2, 3, 4,},
XU Houze²,
ZHANG Chuanyin¹

1.
Chinese Academy of Surveying and Mapping, Beijing 100830, China
2.
Institute of Geodesy and Geophysics, CAS, Wuhan 430077, China
3.
University of Chinese Academy of Sciences, Beijing 100039, China
4.
Key Laboratory of Geo-Informatics of National Administration of NASG, Beijing 100830, China

Funds:

The National Natural Science Foundation of China 41304009

The National Natural Science Foundation of China 41374081

the Open Research Fund Program of Key Laboratory of Geo-Informatics of National Administration of Surveying, Mapping and Geoinformation 777142109

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Author Bio:
DING Jian, PhD candidate, specializes in the theories of physical geodesy and methods of earth gravitational model estimation. E-mail: dingjian@casm.ac.cn
Received Date: February 17, 2016
Published Date: June 04, 2018

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Abstract

Abstract

This paper proposes an evaluation approach for an earth gravitational model(EGM), which is based on the equigeopotential surface character of the geoid. We select a gravity geoid as reference surface, calculated the gravity potentials of different EGMs on the reference surface, to build an index of gravity potential standard deviation to evaluate EGMs. We evaluated the theoretical ability for compliance of different EGMs and the same EGM applied in different areas of the earth using the approach. The results show that the geoid precisions of EGM96 and OSU91A are respectively ±11.1 cm and ±14.3 cm, meaning that the precision of EGM96 is better than that of OSU91A, while the EGM2008, EIGEN-6C4 are similar in precision. These are consistent with the existing research conclusions. But, the result further suggests that the precision of EGM2008 is slightly better than that of EIGEN-6C4 at the cm level.
- geoid,
- earth gravitational model (EGM),
- gravity potential standard deviation,
- accuracy evaluation

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References

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