bicubic spline function fit 双三次样条函数拟合
There are many works on spline function fit, but they do not take into account correlativeerror.
多家数据的样条拟合，已有不少工作，但都没考虑相关误差。
The spline polishing method is used for dispersion value of typography elevation difference to conduct fit polishing so as to get the near function which is used in calculation.
其中利用了样条磨光方法对地形高差离散值进行拟合磨光求得曲面近似函数，用之参与计算。
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