基于EGM2008地球重力场模型-Griddata函数组合模型的似大地水准面精化探讨

Discussion of Refining the Geoid Based on EGM2008-Griddata Function Combination Model

介绍了EGM2008地球重力场模型以及MATLAB提供的Griddata函数,结合工程实例,探讨基于EGM2008地球重力场模型-Griddata函数组合模型对似大地水准面进行精化,在Griddata函数提供的4种不同插值方法下进行分析比较,并根据4种不同插值的特点进行改进,最后得出基于EGM2008地球重力场模型-Griddata函数法中利用四格点样条插值法替代3次多项式插值法中凸包点法的拟合效果最好,具有很好的实际推广意义。

The paper introduced the EGM2008 gravity field model and the Griddata function that was provided by MATLAB. At the same time, the paper combining with the engineering example presented a new method which was the EGM2008 gravity field model-Griddata function model to refine the geoid. Meanwhile, Analysis and comparison was made with four kinds of interpolation methods pro- vided by Griddata function. At the last, we got a conclusion that the new method had a good fitting effect on the geoid refinement by analyzing the result of the date, and it had an important significance in the actual production.