一种基于Delaunay三角网边长阈值与激光点云的建筑立面结构提取方法  

Building Facade Structure Extraction Based on the Threshold of Lengths of Delaunay Triangulation’s Sides and Laser Point Cloud

作　　者：靳鑫洋 王素元 聂建亮 李豪 吴勇生 王金月 JIN Xin-yang;WANG Su-yuan;NIE Jian-liang;LI Hao;WU Yong-sheng;WANG Jin-yue(Geodetic Data Processing Center of Ministry of Natural Resources,PRC,Xi'an 710054;The First Topographic Surveying Brigade of MNR,PRC,Xi'an 710054;Taiyuan Normal University,Jinzhong 030619;Hunan Lianzhi Bridge&Tunnel Technology Co.,Ltd.,Changsha 410200;Map Supervision Center of MNR,PRC,Beijing 100830,China)

机构地区：[1]自然资源部大地测量数据处理中心,陕西西安710054 [2]自然资源部第一地形测量队,陕西西安710054 [3]太原师范学院,山西晋中030619 [4]湖南联智桥隧技术有限公司,湖南长沙410200 [5]自然资源部地图审查中心,北京100830

出　　处：《地理与地理信息科学》2019年第5期80-84,共5页Geography and Geo-Information Science

基　　金：国家自然科学基金项目(41574003、41774004、41474015、41604001);科技基础性工作专项重点项目(2015FY210400);陕西地理信息局科技创新专项基金;现代工程测量国家测绘地理信息局重点实验室开放基金(TJES1504);地理空间信息工程国家测绘地理信息局重点实验室开放研究基金

摘　　要：该文提出了一种基于Delaunay三角网边长阈值与激光点云的建筑物立面结构提取方法。首先对建筑物点云数据进行去噪等预处理,并采用RANSAC算法对点云数据进行立面分割,然后构建Delaunay三角网,并利用三角网边长的统计信息,自动设置区分长短边的阈值,以此提取建筑物立面点云的边界点。实验结果表明,该方法能够有效地提取较为完整的建筑物立面结构,且与平面投影法提取结果对比也验证了其可靠性。A new algorithm of building facade structure extraction based on the threshold of lengths of Delaunay triangulation's sides and laser point cloud is proposed in this paper.Firstly,the data pre-processing is used to filter noise from the original building point cloud,then,the RANSAC algorithm is employed to perform the point cloud segmentation to find the building facade.Next,the Delaunay triangulation is constructed for the point cloud of the building facade.In general,the side of a triangle which is longer than most other triangles contains the outline points.Therefore,the next key step is to search the threshold to distinguish the long side of the triangulation network.The statistical information of the side length of the triangulation network and mathematical differential method are combined to obtain the threshold automatically.Finally,the threshold is applied to extract the boundary points of the building and get the boundary-line.The experiment results show that this method can extract the detailed building facade structure effectively.And the reliability of the method in this paper is verified by comparing with planar projection.

关 键 词：建筑物立面结构 立面分割 DELAUNAY三角网 平面投影法 

分 类 号：P237[天文地球—摄影测量与遥感] TP391.41[天文地球—测绘科学与技术]