在林道设计中,求算横断面积的方法很多,包括:几何法、方格法、求积仪法和纵距和法等,其中纵距和法(也称两脚规法)是我们经常采用的方法。这种方法的特点是简便易行、精度高,不需要专门的求积仪器。实践证明,精度一般都在1/200以上。纵距和法计算面积的原理:如下图 In the design of the forest, there are many ways to calculate the cross-sectional area, including: geometric method, grid method, plotting method and vertical distance and law, etc., of which the vertical distance and the law (also known as the two-legged rule) Methods. This method is characterized by simple and easy to use, high precision, does not require a special quadrature instrument. Practice has proved that the accuracy are generally more than 1/200. Longitudinal distance and method of calculating the area of ​​the principle: the following figure