三维激光扫描系统在立木材积测定中的应用

Application of 3D laser scanning system in mensurating standing volume.

该文提出了一种测定疏林立木材积的新方法,即利用三维激光扫描系统测量立木材积并建立材积表.采用该方法在标准地内按径阶对立木进行三维扫描,可以获取基本测树因子(包括立木的胸径、树高、冠幅)和三维立木模型,由Cyclone扫描软件可以计算立木材积.由扫描获取的立木胸径和树高能够回归建立二元立木材积方程.为检验扫描获取的基本测树因子的精度以及材积方程的适用程度,将扫描后的立木伐倒,并采用区分求积法实测材积.对比扫描数据和实测数据,扫描获取的基本测树因子和扫描材积均满足精度要求,说明这种新方法能够用于森林资源调查和建立立木材积表.

In this paper,the authors put forward a new method of 3D laser scanning system for measuring standing volume and constructing volume table.With the method,the factors of forest mensuration,including diameter at breast height(DBH),tree height and crown diameter were obtained,and a 3D model of trees was established by scanning sample trees of every diameter grate in the sample plots.The scanning volume was calculated by Cyclone software.Bivariate regression equation of tree volume was established based on both DBH and tree height of scanning data.For checking the factors' investigation precision and the applicability of the volume equation,the scanned trees were cut down to measure the volumes with sectional measurement.By comparing the scanning data and experimental data,it is concluded that the precision of the investigation factors and scanning volumes could meet the error criterion.The new method can be applied in to the forest resource inventory and constructing standing tree volume table.