大地水准面数值计算及结构分析

针对大地水准面精化问题,该文提出了基于大地水准面起伏几何性质构建精确大地水准面的方法。相对传统方法根据经验公式设计精化大地水准面分辨率,该文提出了一种顾及区域性特点的大地水准面分辨率设计方法,推导了构建厘米级大地水准面需要达到的空间分辨率计算公式。采用Alltrans EGM2008Calculator 1.00软件计算不同区域的大地水准面高程,并用坡度方法分析大地水准面的精细结构。最后以江西省大地水准面起伏为基础,采用该方法进行计算。结果表明:构建厘米级大地水准面需要达到的空间分辨率为7″,可为大地水准面精化研究提供参考。

Geoid numerical calculation and structural analysis

In order to deal with the issue of geoid refining,this paper presented a method based on the geometric properties of geoid undulation.Different from the traditional technique that refining geoid resolution is designed on the basis of the empirical formula,a new method that takes the regional characteristics into account was proposed.In addition,the resolution equations for centimeter level geoid were derived according to the method.The Alltrans-EGM2008 Calculator 1.00 software was used to calculate the geoid in different regions and the fine structure of the geoid was analyzed by slope numerical algorithm.The calculation results of the proposed method based on the geoid fluctuation of Jiangxi province showed that the spatial resolution of the model should be 7" in order to format centimeter geoid,which could provide reference for the study of geoid refinement mask.