珠海市陆海统一似大地水准面精确求定

Precise Determination of the Terrestrial and Marine Unified Quasi-geoidin in Zhuhai City

在海域广阔、河网密布的海滨城市珠海,基于区域陆海重力、地形数据,利用第二类Helmert凝集法精确求取了覆盖珠海市陆海全域的重力似大地水准面,解决了跨海岸线重力归算等关键问题;通过球冠谐调和分析法,将求取的重力似大地水准面与新测的高精度GNSS水准成果融合,获取了珠海市2'×2'陆海统一似大地水准面。以港珠澳大桥首级控制点为主的精度统计表明,该陆海统一似大地水准面模型外符合精度达到±0.008 m。

In the coastal city of Zhuhai, the waters is greater than the land area. Based on the regional gravity and topography data, the gravity quasi - geoid in Zhuhai was determined by the Helmert^ second condensation method, which has solved the key problem such as across the coastline gravity reduction. Then the GNSS/leveling data and the gravity quasi - geoid was derived with spherical cap har-monic methodandhas determined the terrestrial and marine unified quasi - geoid of 2＇ x 2＇ resolutionwith accuracy of ±0.008 m.