Abstract

To address the establishment of vertical datum with multiple tide gauge stations under the multibeam non-tide gauging mode, this paper adopts the optimized XGM2019 gravity field model. In combination with Surfer software and an elevation anomaly calculation program, a complete generation method and operational workflow for the geodetic height grid model of chart datum are established in accordance with the principle of tide-free bathymetric surveying. Verified by practical case experiments, the proposed construction method for the vertical datum grid is feasible. The sounding accuracy satisfies the specifications for hydrographic surveys and this method can effectively meet the water level correction requirements of multibeam non-tide gauging surveys in large-scale areas.

Keywords:Optimized Xgm2019 gravity field model; Multibeam bathymetric survey; Non-Tide gauging mode; Vertical datum; Geodetic height of chart datum