IDW(Inverse Distance Weighted)是一种常用而简便的空间插值方法，它以插值点与样本点间的距离为权重进行加权平均，离插值点越近的样本点赋予的权重越大。-IDW (Inverse Distance Weighted) is a common and simple spatial interpolation method that the distance between the interpolation point and the sample point is weighted by average, right　the interpolation point nearer sample points given greater weight.