丹麥科技大學教授寫的插值工具，Fortran和.exe都有，快捷好用，英文說明如下：program for interpolating values from a grid using bilinear or spline interpolation. the grid or the prediction points may be c in either geographical or utm coordinates. the spline prediction is performed in a window of size 'nsp' x 'nsp' points around thec wanted points, with typical value of nsp being 8 for a good interpolation.