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当前位置: 首页 > 文章 > 基于点云数据的测树因子自动提取方法 农业机械学报 2017 (8) 179-185
Position: Home > Articles > Automatic Extraction Method of Tree Measurement Factors Based on Point Cloud Data Transactions of the Chinese Society for Agricultural Machinery 2017 (8) 179-185

基于点云数据的测树因子自动提取方法

作  者：
杨全月;陈志泊;孙国栋
单  位：
北京农学院计算机与信息工程学院;北京林业大学信息学院
关键词：
树冠表面积;树冠体积;测树因子;自动提取;三维激光扫描仪;三维凸包算法
摘  要：
树冠的结构复杂、形态各异,测树因子的自动、准确、无损测量是森林调查中的一个重要研究项目。以三维激光扫描仪获取的三维点云数据为研究对象,基于计算几何学的寻找凸包算法,自动提取树冠的表面积、投影面积以及体积等测树因子。为验证算法的准确性,随机选取8个树种的120株待测立木进行试验,试验表明该方法测得的立木树高平均相对误差为2.33%,胸径平均相对误差为1.10%,冠幅平均相对误差为3.92%,自动解算的树冠表面积、树冠投影面积以及树冠体积相对于传统方法测得的参考值的平均相对误差分别为3.48%、6.01%和5.59%。因此以三维激光扫描仪获取点云数据,运用三维凸包算法,能够自动准确计算这些原本难以精确测量的因子,为应用三维激光扫描仪自动提取立木的测树因子提供了参考。
译  名：
Automatic Extraction Method of Tree Measurement Factors Based on Point Cloud Data
作  者：
YANG Quanyue;CHEN Zhibo;SUN Guodong;School of Information Science and Technology,Beijing Forestry University;School of Computer and Information Engineering,Beijing University of Agriculture;
关键词：
crown surface area;;crown volume;;tree measurement factors;;automatic withdrawal;;3D laser scanner;;3D convex hulls algorithm
摘  要：
On account of the crown 's complicated structure and various forms,extracting the tree measurement factors of standing tree automatically,accurately and nondestructively is an important research subject in the forest survey. The three-dimensional( 3D) point cloud data via 3D laser scanner was used as the study object. The 3D convex hulls construction algorithm based on computational geometry was presented to extract the crown surface area,crown projection area and crown volume automatically. In order to verify the accuracy of the algorithm,totally eight tree species and 120 standing trees were randomly selected for testing. The average relative errors of standing tree height,DBH and crown width were 2. 33%,1. 10% and 3. 92%, respectively. The relative average errors of auto computing for crown surface area,crown projection area and crown volume were 3. 48%,6. 01% and 5. 59%,respectively. 3D point cloud data via 3D laser scanner and 3D convex hulls construction algorithm could help to automatically and accurately calculate the values of these parameters which could not be measured accurately before,providing a reference for extracting the tree measurement factors of standing tree automatically via 3D laser scanner in the future. The proposed method had a practical prospect of application in the survey of forest resources.

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