自然资源遥感2024，Vol.36Issue(3)：81-87,7.DOI:10.6046/zrzyyg.2023112
地基激光雷达单木树冠体积提取球坐标积分法
A spherical coordinate integration method for extracting crown volumes of individual trees based on the TLS point clouds
摘要
Abstract
Crown volumes serve as a crucial factor for surface ecological monitoring.Laser point clouds can characterize the fine-scale spatial morphologies of individual trees,providing a data basis for crown volume extraction.However,existing laser point cloud-based methods for extracting crown volumes of individual trees are sensitive to parameters and exhibit low degrees of automation.Based on the analysis of the three-dimensional morphological structures of individual trees,this study proposed a spherical coordinate integration method for extracting crown volumes of individual trees based on the terrestrial laser scanning(TLS)point clouds.First,the crown points were obtained through visual elevation threshold-based segmentation according to the elevation distributions of TLS point clouds.Then,the TLS point clouds were projected onto the spherical coordinate space for infinitesimal segmentation into triangular pyramids.Finally,the crown volumes were determined through the three-dimensional spherical coordinate integration.Six types of TLS point cloud data for individual trees were selected for tests.As indicated by the test results,the proposed method effectively considers factors like crown morphology and point cloud density,achieving a maximum absolute error of 2.33 m3 and a maximum relative error of 3.40％in the crown volume extraction of individual trees.It manifests higher extraction accuracy and stability compared to the existing methods.Therefore,this study holds significant reference value for extracting tree parameters based on TLS point clouds.关键词
树冠体积/激光点云/球坐标/微元体Key words
crown volume/TLS point cloud/spherical coordinate/infinitesimal element分类
信息技术与安全科学引用本文复制引用
麻卫峰,吴小东,王冲,闻平,王金亮,曹磊,肖正龙..地基激光雷达单木树冠体积提取球坐标积分法[J].自然资源遥感,2024,36(3):81-87,7.基金项目
国家自然科学基金项目"联合ULS与TLS点云数据的滇西北天然林单木生物量估算研究"(编号:41961060)和云南省基础研究计划项目"机载LiDAR输电线路本体参数化建模方法研究"(编号:202401AT070111)共同资助. （编号:41961060）
