当采用多面函数（函数模型）对一个GPS高程异常变化剧烈的区域进行拟合，得到的残差比较大时，再使用Shepard插值（统计模型）对残差进行拟合。该模型既利用了函数模型的规律性，同时也发挥了统计模型的随机性，往往会获得比单一模型更好的效果。-When using the multi-faceted function (function model) for a GPS Elevation unusually drastic change region by curve fitting residual is large, then use the Shepard interpolation (statistical model) residuals fitting. The model utilizes both the regular function model, but also play a random statistical models tend to get better results than a single model.