bisect
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然后用三次样条法拟合剖面边缘曲线并插值采样，把立体树冠分解成许多微小的切片分别求体积和 表面积，依次累加就得到所需结果。
These data are fit with method of spline and resampled to divide crown into many small slices, whose volume and surface add up to the result.
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