摘要
树冠是指树干以上连同其生枝叶的部分,其体积的大小是估算树木三维绿量的重要参数。校园绿地中乔木树冠形态各异,结构复杂,树木树冠体积的准确、自动、无损测量是校园绿地调查中的一个重要研究项目。随机抽取广西生态工程职业技术学院内5个树种共计25棵乔木的三维激光点云数据与树木三维绿量冠幅-冠高公式法进行了对比研究。以三维激光扫描仪获取的三维激光点云数据基于不规则三角网法计算乔木树冠体积。计算结果对比表明:测量值与参考值的均方根误差RMSE为2.913、绝对误差最大值为7.22 m3,最小值为0.17 m3;相对误差最大值为11.06%,最小值为0.12%;平均绝对误差为2.20 m3,平均相对误差为3.13%,该算法不用考虑树冠的形状,减少了人为判别导致的差异。因此,以三维激光扫描仪获取点云数据,运用不规则三角网法自动提取校园绿地乔木树冠体积快捷、有效、可推广。
The crown of a tree refers to the part above the trunk along with its branches and leaves,and its volume is an important parameter for estimating the three-dimensional green volume of a tree.The canopy morphology of trees in campus green spaces is diverse and the structure is complex.Accurate,automatic,and non-destructive measurement of tree canopy volume is an important research project in campus green space investigation.A comparative study was conducted between the three-dimensional laser point cloud data of 25 trees from 5 randomly selected tree species and the three-dimensional green quantity crown width crown height formula method of trees.The 3D laser point cloud data obtained from a 3D laser scanner is used to calculate the volume of tree canopy based on the irregular triangulation method.The comparison of calculation results shows that the root mean square error(RMSE)between the measured value and the reference value is 2.913,with a maximum absolute error of 7.22 m 3 and a minimum error of 0.17 m 3;The maximum relative error is 11.06%,and the minimum value is 0.12%;The average absolute error is 2.20 m 3,and the average relative error is 3.13%.This algorithm does not need to consider the shape of the tree crown,reducing the differences caused by human discrimination.Therefore,using a 3D laser scanner to obtain point cloud data and using irregular triangulation to automatically extract the volume of tree canopies in campus green spaces is fast,effective,and scalable.
作者
肖万娟
唐健灵
骆姚瑶
苏玉峰
Xiao Wanjuan;Tang Jianling;Luo Yaoyao;Su Yufeng(Guangxi Eco-Engineering Vocational and Technical College,Liuzhou 545004,Guangxi,China;Guangzhou Southern Surveying and Mapping Technology Co.,LTD,Guangzhou 510663,Guangdong,China)
出处
《绿色科技》
2024年第11期15-21,共7页
Journal of Green Science and Technology
基金
广西高校中青年教师科研基础能力提升项目(编号:2022KY1236)。
关键词
乔木三维绿量
树冠体积
三维激光点云
大学校园绿地
three dimensional green quantity of trees
crown volume
three-dimensional laser point cloud
university campus green space
