Vertical Deviation Determination of Height Datum in Zhongshan Station Using GNSS/Gravity Method

  Objective  There are innumerable scientific mysteries and resources in Antarctica, which has been one of the research hotspots. Many countries and organizations are competing to establish scientific research stations in Antarctica. However, due to the lack of a unified height datum, all height-related information can not be accurately identified and unified. We attempt to determinate the vertical deviation between height datum of Zhongshan Station and Chinese1985 height datum.

  Methods  Global navigation satellite system(GNSS) geodetic boundary value problem is not restricted by local height datum, which facilitates the unification of global datum. First, the basic principles and methods of GNSS/gravity method are summarized. Then, the data of GNSS/leveling and gravity of Zhongshan Station in Antarctica are collected and introduced. Finally, the vertical deviation between the height datum of Zhongshan Station in Antarctica and Chinese1985 height datum can be calculated by two gravity field models of EGM2008 and EIGEN-6C4.

  Results  The vertical deviation between the height datum of Zhongshan Station in Antarctica and the global height datum is -1.455 m. The vertical deviation between the height datum of Zhongshan Station in Antarctica and Chinsese1985 height datum is -1.759 m.

  Conclusions  This work will provide more accurate global elevation benchmarks for Antarctic information of surveying, mapping and geographic.It is of great value for more accurate prediction of the impact of Antarctic glacier melting on low elevation areas.