引用本文: 刘鑫宇, 李姗姗, 张盼盼, 范雕, 裴宪勇. 顾及剩余地形影响的局部高程基准统一方法[J]. 武汉大学学报 ( 信息科学版).
LIU Xin-yu, LI Shan-shan, ZHANG Pan-pan, FAN Diao, PEI Xian-yong. Local vertical datum unification method considering effect of residual terrain[J]. Geomatics and Information Science of Wuhan University.
 Citation: LIU Xin-yu, LI Shan-shan, ZHANG Pan-pan, FAN Diao, PEI Xian-yong. Local vertical datum unification method considering effect of residual terrain[J]. Geomatics and Information Science of Wuhan University.

## Local vertical datum unification method considering effect of residual terrain

• 摘要: 为了解决全球高程基准统一的问题，本文联合EIGEN-6C4地球重力场模型、GNSS/水准数据、重力异常数据基于大地边值问题方法将局部高程基准统一至全球高程基准中。为了改善地球重力场模型存在截断误差的问题，利用空域法和剩余地形模型将剩余地形转化为重力场信号，然后基于移去-恢复法得到全波段的重力场信息。实验表明，在美国区域和中国区域RTM地形效应均达到了分米级。因此，为了提高区域重力大地水准面的建模精度，尤其是在地形起伏较大的区域，应考虑剩余地形的影响。最后，基于空域法和大地边值问题方法确定了中国1985国家高程基准和NAVD88高程基准的重力位分别为62636852.749m2s-2和62636852.186m2s-2

Abstract: Objective: In order to solve the problem of global vertical datum unification, this paper unifies the local vertical datum into the global vertical datum based on the geodetic boundary value problem together with EIGEN-6C4 Earth gravity field model, GNSS/level data and gravity anomaly data. Methods: In order to improve the omission error of the earth's gravity field model, the space-domian method and the remaining terrain model are used to convert the remaining terrain into gravity field signals, and then the gravity field information of the whole band is obtained based on the removal-recovery method. Results: Experiments show that the RTM terrain effect reaches the decimeter level in both the US region and the Chinese region. Therefore, in order to improve the modeling accuracy of the regional gravity geoid, especially in areas with large terrain fluctuations, the influence of the remaining terrain should be considered. Conclusions: Finally, the gravity potentials of China's 1985 national vertical datum and NAVD88 elevation datum were determined based on the space-domian method and the geodetic boundary value problem, respectively, 62636852.749m2s-2 and 62636852.186m2s-2.

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