结果表明，利用通用坐标转换程序，结合解析法求算面积的方法是解决无测积功能GPS测量面积的理想方法。

The results showed that using universal coordinate transform program and analytic geometry method could resolve the problem of measuring area for GPS without function of measuring area.

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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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