Evaluation of earth gravitational models based on classic geoid definition

doi:10.7523/j.issn.2095-6134.2016.04.014

›› 2016, Vol. 33 ›› Issue (4): 528-536.DOI: 10.7523/j.issn.2095-6134.2016.04.014

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Evaluation of earth gravitational models based on classic geoid definition

DING Jian^1,2,3, XU Houze², ZHANG Chuanyin¹

1. Chinese Academy of Surveying and Mapping, Beijing 100830, China;
2. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2016-01-25 Revised:2016-03-20 Online:2016-07-15

Abstract

Abstract:

We propose an evaluation approach of earth gravitational models (EGMs) based on Gauss-Listing classic geoid definition.The classic geoid is defined as an equigeopotential surface.Using this character, we select a gravity geoid as reference surface, calculate the gravity potentials of different EGMs on the reference surface, and establish an index of gravity potential dispersion to evaluate EGMs.Using this approach we evaluate theoretical compliance abilities of different EGMs and of an EGM applied in different areas in the earth.The results show that the precision of EGM96 is higher than that of OSU91, and EGM2008 and EIGEN-6C4 have similar precisions.The results are consistent with the existing research conclusions.The results further declare that the precision of EGM2008 is slightly higher than that of EIGEN-6C4 in the cm level.

Key words: Gauss-Listing classic geoid definition, earth gravitational model(EGM), gravity potential dispersion, accuracy evaluation

CLC Number:

P312.1

DING Jian, XU Houze, ZHANG Chuanyin. Evaluation of earth gravitational models based on classic geoid definition[J]. , 2016, 33(4): 528-536.

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Evaluation of earth gravitational models based on classic geoid definition

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