Still trying different interpolation methods, such as Inverse Distance, RBF, Spline etc.

依旧在尝试不同的差值方法，包括反向距离权重、RBF、样条等等。

Inverse distance interpolation can produce a totally precise result, but in area such as valley or peak of a mountain, it will induce considerable error.

距离倒数插值从整体上保证了插值结果的准确度，但在局部地形突变的区域误差较大。基于最小二乘思想的线性拟合方法能弥补这一不足。