利用Alpha-shape算法进行树冠三维模型构建  

Construction of Tree Crown Three-dimensional Model Using Alpha-shape Algorithm

作　　者：李庆 高祥伟 费鲜芸 张红 王健 崔云健 李彬 LI Qing;GAO Xiangwei;FEI Xianyun;ZHANG Hong;WANG Jian;CUI Yunjian;LI Bin(School of Geomaties and Marine Information,HuaiHai Institute of Teehnology,Lianyungang 222002,China)

机构地区：[1]淮海工学院测绘与海洋信息学院,江苏连云港222002

出　　处：《测绘通报》2018年第12期91-95,共5页Bulletin of Surveying and Mapping

基　　金：国家自然科学基金(31270745);连云港国土局测绘项目(LYGCHKY201701);连云港市科技局项目(SH1629);研究生科研创新计划(XKYCXZ2017-4);江苏省海洋资源开发研究院开放课题(JSIMR201503);江苏省海洋科学技术优势学科资助江苏省优势学科建设工程资助(PAPD);江苏省海洋技术品牌专业资助(PPZY2015116)

摘　　要：为了研究树冠三维模型的构建,以常用绿化树种榉树为样本,通过三维激光扫描技术获取点云数据,运用alpha-shape算法进行树冠三维模型构建,并通过调整其α参数,得到不同的三维模型构建效果。结果表明,当参数α取值较大时,构建的三维模型较综合,树冠内部变化无法描述;随着α值的减少,构建的三维模型越来越精细,当减少到一定值时,得到的图形是一些离散的面片,重建结果不完整,不能形成树木模型。利用alpha-shape算法构建的树冠三维模型能够反映出树冠的不同空间形态特征,可作为计算冠层结构参数的基础和依据,深入研究可进一步计算相关结构参数。In order to study the method of constructing the three-dimensional model of canopy,in this paper,the point cloud data acquisition platform was a three-dimensional laser scanner (Leica scanstation C10),with a common greening tree Zelkova serrata chosen as an experimental sample.Based on the points cloud of sample tree crowns,the 3D crown models were constructed using the alpha-shape algorithm in the Matlab software with different size value of the parameter-α.The results showed that when larger parameter-α value was employed,the 3D model was more general and the crown internal construction could not be described.With the decrease of the parameter-α value,the 3D model was becoming more and more detailed.When it decreased to a certain lower value, the modeling result became some of discrete graph patches,then the reconstructed results were incomplete and could not form a completed 3D model of the tree crown.The 3D crown model constructed by using the alpha-shape algorithm can reflect the different spatial morphological characteristics of the crown,and can be used as the base for the calculation of crown structural parameters.The results of the study can be used as reference for calculating the related structural parameters in further research work.

关 键 词：点云数据 树冠三维模型 三维重建 alpha-shape 三维激光扫描技术 

分 类 号：P237[天文地球—摄影测量与遥感]