基于地面三维激光扫描技术的单木胸径树高提取精度研究

Research on Extraction Precision of DBH and Height at Single-Tree Level Based on Terrestrial Three-Dimensional Laser Scanning Technology

利用地面三维激光扫描仪提取单木参数,已经成为林业测量领域的研究热点,尤其在编制林业数表方面极具应用前景.基于地面三维激光扫描仪采集19株柏木和17株马尾松样本数据,提取单木胸径和树高两个主要测树因子,并与实际数据进行对比分析,结果表明:胸径因子采用凸包算法提取精度更高,相对误差为1.18%;树高测量精度较高,平均相对误差为-1.66%;基于地面三维激光扫描技术提取单木胸径和树高,完全满足调查精度要求,可以广泛应用于森林资源调查,以及单木及林分不同尺度数表编制等方面.

The extraction of individual tree parameters by terrestrial three-dimensional laser scanner had become a research hotspot in the field of forestry measurement,especially in forestry^data tables.Based on the data of Cypress trees and Masson pine trees collected by three-dimensional laser scanner,two main tree measurement factors,DBH and tree height,were extracted and compared with the actual data.The results showed that the precision of DBH factor extraction by convex hull algorithm was considerably higher and the relative error was 1.18%.The precision of tree height measurement was higher and the average relative error was-1.66%.Three dimensional laser scanning technology which extracted DBH and height fully met the requirement of survey accuracy,and can be widely used in forest investigation and forestry data table at different scales.