average value area

A key difference is that this algorithm does not give the same value at the sampling point but gives the same average value in unit area of each pixel.

此算法的关键不同点在于不是让算法结果在采样点的值等于原采样值，而是在一个象素大小的单位面积上得到的平均值等于原采样值。

In the mountainous watershed of the Heihe River, the runoff coefficient is much larger than that of the whole arid area, but it is still less than the average value over the whole country.

黑河山区流域径流系数远比干旱内流区的平均值大，但要小于全国的平均径流系数。