基于地面激光扫描数据的单木特征因子提取与分析

Extraction and analysis of single tree measure factors based on point cloud data of terrestrial laser scanning

本文利用三维激光扫描仪对树木进行扫描获取树点云数据,经过格式转换、分离、提取后,对树木各测量因子包括胸径、树高、树冠、材积量进行测定与测量方法与意义的分析。通过实验分析,可以得出:树冠测定因子通过测定树冠的叶面积指数来更精确地反映树冠的生理学意义;通过不规则三角网构建的多面体计算的树干体积较以平均断面积、中央断面积求树干材积更为准确与便捷。

Three dimension laser scanning technique was introduced into forestry as a new forest survey technique for a short time, by which spatial coordinates of stumpage on the ground can be obtained. This paper used the point cloud data of each stumpage to build three dimension model using software. The factors of forest measurement such as tree height, tree diameter at breast height （DBH） and crown diameter were directly measured in the model and the volumes were calculated. Then leaf area index （LAI） can be used to measure more accurately and volume of tree can be calculated more quickly and precisely using triangulated irregular network.