Determination of the Vertical Deviation for China Height Datum with Coordinates of Dagang Tidal Gauge

Acta Geodaetica et Cartographica Sinica

WEI Ziqing¹  LIU Guangming²  WU Fumei² 

[1] ;State Key Laboratory of Geo-information Engineering, Xi'an 710054, China;

关键词: height datum;    Dagang tidal gauge;    vertical deviation;    GPS/leveling data;   

DOI  :  10.11947/j.AGCS.2018.20170051

来源: DOAJ

【 摘 要 】

Determining the vertical deviation for a local height datum relative to the geoid is an important approach to the unification of the Global Vertical Datum. In this paper, we aim at direct determination of the vertical deviation for China Height Datum with the coordinates of Dagang Tidal Gauge. First, the principles for determination of the vertical deviation with the coordinates of Dagang Tidal Gauge are introduced. Then the methods and the processes for measuring and calculating the coordinates of Dagang Tidal Gauge are elaborated. Next EGM2008 and EIGEN-6C4 models are used to calculate the gravity potential with the coordinates of Dagang Tidal Gauge, and the results are compared with those obtained with GPS/Leveling data. It is found that the gravity potential obtained from EGM2008 model is more reliable than that from EIGEN-6C4 model, and the vertical deviation for China Height Datum with the coordinates of Dagang Tidal Gauge is 0.344 m, which is 0.006 m smaller than that with GPS/leveling data.

【 授权许可】

Unknown