基于背包激光扫描点云强度的胸径提取方法研究  

Study on Extraction Method of DBH based on Intensity of Backpack Laser Scanning Point Cloud

作　　者：黄志鑫 邢涛[1] 邢艳秋[1] Huang Zhixin;Xing Tao;Xing Yanqiu(Centre for Forest Operations and Environment,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学森林作业与环境研究中心,黑龙江哈尔滨150040

出　　处：《遥感技术与应用》2021年第6期1284-1293,共10页Remote Sensing Technology and Application

基　　金：国家重点研发计划(2017YFD060090402)。

摘　　要：为了提高背包激光扫描点云林木胸径提取精度。以3块山区人工林做为研究对象,选取距离地面1.3 m处一定厚度的树干点云为胸径切片,切片厚度分别为0.2 m、0.4 m和0.6 m。对切片点云基于点云强度划分点云区间以获得多种胸径切片,将处理得到的切片点云映射到二维平面,采用最小二乘法对二维点进行胸径提取。结果表明:切片厚度为0.6 m、强度区间为[5,10]的切片点云提取胸径结果最好,3块样地胸径提取结果RMSE分别为0.46 cm、0.83 cm和1.03 cm,MAE分别为0.37 cm、0.66 cm和0.81 cm,相对精度分别为97.03%、94.73%和96.73%。相比于同等条件下完整点云结果,RMSE分别降低了61.34%、25.90%和61.71%,MAE分别降低了68.91%、31.96%和65.97%,相对精度分别提高了6.10%、1.95%和5.8%。并且使用点云数量分别降低了97.63%、97.25%、97.83%,平均用时分别提高了98.5%、97.6%、96.36%。通过使用最佳强度区间内的点云提取胸径,不仅可以减少点云数量节约时间成本,更能够提高胸径提取精度,并为提取其他林木参数提供参考。To improve the accuracy of extracted DBH of forest trees in backpack laser scanning point clouds.Taked three mountain plantations as research objects,point clouds of tree trunk with a certain thickness in the1.3 m away from the ground was selected as the DBH slices,and the slice thickness were 0.2 m,0.4 m and 0.6 m respectively.The slice point clouds were divided into point cloud intervals based on the intensity of point clouds to obtain variety of DBH slices.The processed slice point clouds were mapped to the 2 D plane,and the DBH of the 2 D points was extracted by least square method.The result shows that the best result is obtained by extracted DBH from the slice thickness of 0.6 m and the intensity interval of[5,10].RMSE of the three plots is 0.46 cm,0.83 cm and 1.03 cm respectively,MAE is 0.37 cm,0.66 cm and 0.81 cm respectively,relative accuracy is 97.03%,94.73% and 96.73% respectively.Compared with the slices of complete under the same conditions,RMSE decreases by 61.34%,25.90% and 61.71% respectively,MAE decreases by 68.91%,31.96% and 65.97% respectively,relative accuracy increases by 6.10%,1.95% and 5.8%,respectively.Furthermore,the number of point clouds used decreases by 97.63%,97.25% and 97.83% respectively,the time of used decreases by 98.5%,97.6% and 96.36% respectively.By using the point clouds in the best intensity interval to extract DBH,it can not only save time by reduce the number of point clouds,but also improve the accuracy of extracting DBH,and provide the reference for extracting other parameters.

关 键 词：背包激光扫描 胸径提取 点云切片 点云强度 区间划分 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]