点云格网化滤波方法及其在隧道变形监测中的应用  

Method of the point clouds filtering by grid handling and its application in the deformation monitoring of tunnel

作　　者：王涛[1] 田林亚[1] 侯建梅[1] 赵旭 张洋 WANG Tao;TIAN Linya;HOU Jianmei;ZHAO Xu;ZHANG Yang(School of Earth Science and Engineering,Hohai University,Nanjing 211100,China;China Design Group Co.,Ltd.,Nanjing 210014,China;Suzhou Geological Engineering Investigation Institute,Suzhou 215129,China)

机构地区：[1]河海大学地球科学与工程学院,江苏南京211100 [2]中设设计集团股份有限公司,江苏南京210014 [3]苏州地质工程勘察院,江苏苏州215129

出　　处：《河海大学学报（自然科学版）》2018年第5期451-457,共7页Journal of Hohai University(Natural Sciences)

基　　金：江苏省研究生科研与实践创新计划项目(KYCX17_0506);江苏省地质矿产勘查局科研项目(2016-KY-03)

摘　　要：将三维激光扫描技术应用于地铁隧道变形监测,针对点云数据的预处理问题,研究基于小波分析的点云格网化滤波方法。结合南京地铁隧道扫描点云数据及其特性,分析和选择合理的插值方法对隧道点云进行格网化处理,采用小波变换对格网点数据进行异常值探测,采用小波阈值去噪对格网点数据进行整体去噪,获得滤波后的点云并进行封装对比,获得了很好的滤波效果。The 3D laser scanning technology was applied to the deformation monitoring of subway tunnel,and for the pre-processing problem of point cloud data,a method of the point clouds filtering with grid handling was studied based on the wavelet analysis.Combining with the scanned point cloud data and its characteristics of Nanjing subway tunnel,this paper analyzed and selected a rational interpolation method to implement the grid processing of the cloud point data.The wavelet transform was used to detect the abnormal values of grid data,and the whole grid data was processed with the threshold de-noising method of wavelet.At last,this study packaged and compared the filtered point cloud data,indicating a very good filtering effect.

关 键 词：地铁隧道 点云格网化 点云滤波 克里金插值 小波分析 

分 类 号：U452.1[建筑科学—桥梁与隧道工程]