Evaluation of the Geopotential Value for the Local Vertical Datum of China Using GRACE/GOCE GGMs and GPS/Leveling Data

doi:10.11947/j.AGCS.2017.20160643

Abstract

Abstract: The main purpose of this paper is to estimate the zero height geopotential value for the China Local Vertical Datum. The method used is based on a gravimetric approach and benefits from the significant improvements in the determination of the global gravity field by the recent satellite gravity missions such as GRACE and GOCE. The performance of GOCE-based or GRACE/GOCE-based Global Geopotential Models (GGMs) is assessed for estimation of geopotential of the regional vertical datum of China using the GPS/Levelling BMs (benchmarks) from vertical control network. We should conver the normal height to orthometric height. From the evaluation with the GPS/Levelling BMs, it is concluded that the GOCE-based or GRACE/GOCE-based GGMs provide an absolute accuracy at of 40 cm, up to their maximum degree and order. Factors that affect the geopotential value of vertical datum include the GOCE commission and omission errors. Among these factors, the effect of the GOCE omission error is investigated by extending the models with the high resolution gravity field model EGM2008. When extending the GOCE-based or GRACE/GOCE-based models with the high resolution gravity field model EGM2008, we should provide the same parameters. At the same time we should unify the frame and tide system between the GGMs and GPS/Levelling dataset. The result shows that, the effect of the GOCE omission error is at the level of 1.6 m²s^-2 (about 16 cm), in China, is at decimetre-level when computing local vertical datum geopotential, the effect of the tide system is about 4-6 cm. The vertical datum geopotential of China is estimated as 62 636 852.704 5 m²s^-2.

Key words: GRACE, GOCE, satellite gravity, vertical datum, omission error, tide system

CLC Number:

P224

HE Lin, LI Jiancheng, CHU Yonghai. Evaluation of the Geopotential Value for the Local Vertical Datum of China Using GRACE/GOCE GGMs and GPS/Leveling Data[J]. Acta Geodaetica et Cartographica Sinica, 2017, 46(7): 815-823.

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