Research on the establishment of digital height datum in Golmud

doi:10.13474/j.cnki.11-2246.2020.0259

Abstract

Abstract: Geoid (digital height datum) provides a new way for the establishment and maintenance of national height datums. However, limited by the terrain and gravity data, the establishment of digital height datum with a high precision on plateau has always been a difficult problem in the field of geodesy. Taking Golmud as an example, we discuss the establishment method of precise digital height datum in plateau area. Firstly, based on gravity data and topographic data, we determine the gravity geoid in Golmud through the Helmert's second condensation method. In the computation, to improve the accuracy of gravity geoid on plateau, the topographic data with high resolution and high precision is used to recovery the short wave of the geoid. Then, the digital height datum of Golmud is established through aligning the gravity geoid to the National Vertical Datum 1985 by a spherical cap harmonic method. Compared with 67 GNSS/leveling points independently, the accuracy of the determined gravity geoid is 3.0 cm, the corresponding precision of digital height datum of Golmud is 2.0 cm.

Key words: quasi-geoid, global navigation satellite system, gravity field model, digital height datum, modern surveying and mapping datum

CLC Number:

P224

DOU Chao, AN Xiangdong, ZHAO Lijiang, ZHANG Shengpeng, BI Taiwu. Research on the establishment of digital height datum in Golmud[J]. Bulletin of Surveying and Mapping, 2020, 0(8): 108-111.

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