说明：  加权平均法是DEM移动内插法的特例，是一种简化的逐点内插法。它是先以内插点为中心，确定一个取样窗口，然后计算落在窗口内的采样点的特征值的平均值，作为内插点的特征值的估值，
(The weighted average method is a special case of the DEM mobile interpolation, a simplified point-by-point interpolation. It is the first interpolation point as the center, to determine a sample window, and then calculate the average of the characteristic values ​ ​ of the sample points falls within the window, the valuation of the points of the feature value as the interpolation,)