Research on the key technology of the unified quasi-geoid refinement in the Beibu Gulf Economic Zone

doi:10.13474/j.cnki.11-2246.2022.0243

Abstract

Abstract: In view of the lack of a unified elevation datum of terrestrial and marine for the construction of ecological civilization,the utilization of marine resources and the disposal of marine emergency rescue events in the Guangxi Beibu Gulf Economic Zone,this paper used 2764 gravity data and 8 GNSS/leveling data in Guangxi Beibu Gulf to solve this problem. Firstly,the gravity quasi-geoid in the area covering Guangxi Beibu Gulf sea area and continental coastline extending inland of about 15000 square kilometers is precisely determined by the Helmert's second condensation method. Then taking the EIGEN6C4 earth gravity field model as the reference gravity field,the determined gravity quasi-geoid is compared with the 8 GNSS/leveling data with an accuracy of 2.2cm. Finally,through spherical cap harmonic analysis,the quasi-geoid accuracy of the 2'×2' grid is improved to 1.6cm,and the terrestrial elevation datum is transferred to the Guangxi Beibu Gulf sea area and its islands,so as to realize the unified regional elevation datum of terrestrial and marine.

Key words: Beibu Gulf Economic Zone, surveying and mapping datum, quasi-geoid, unification of land and sea, fusion

CLC Number:

PAN Zhengqiang, ZHONG Changhai, ZUO Tianhui, LIN Zile, KONG Jian, TANG Changzeng. Research on the key technology of the unified quasi-geoid refinement in the Beibu Gulf Economic Zone[J]. Bulletin of Surveying and Mapping, 2022, 0(8): 123-127.

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