地面激光扫描技术在古石拱桥建模中的应用  

Application of terrestrial laser scanning technology in the modeling of ancient stone arch bridge

作　　者：刘德贺 史玉峰[1] 

机构地区：[1]南京林业大学土木工程学院

出　　处：《激光杂志》2018年第2期101-104,共4页Laser Journal

基　　金：住房和城乡建设部科技计划项目(No.2016-R2-026)

摘　　要：针对一些历史久远的古石拱桥缺乏可靠的设计资料,难以高效地识别其详细的整体几何特征等问题,提出一种利用地面激光扫描（TLS）技术对其进行建模的方法。首先应用TLS技术采集古石拱桥整体三维点云数据,然后采用基于几何特征的拼接方法对多视点点云数据进行配准、去噪和精简,采用NURBS算法对石拱构件进行提取、拟合和曲面重建,构建出石拱桥三维实体模型。结果表明,利用TLS技术可以全面、准确地获取石拱桥点云数据,实现对石拱桥三维建模,为古石拱桥几何结构监测、加固和复原提供了基础数据。Considering the problems that some ancient stone arch bridges with a long history lack reliable design data,and it is difficult to identify their detailed geometric features efficiently. A method of modeling using terrestrial laser scanning（ TLS） technology was proposed in this article. First,the TLS technology was applied to collect whole 3D point cloud data of ancient stone arch bridge,and then the stitching method based on geometric features of multiview point cloud data registration,denoising and simplification,using non-uniform rational B-spline（ NURBS） algorithm for extracting,fitting and surface reconstruction of arch components to construct 3D model of stone arch bridge. The results show that TLS technology can be used to obtain point cloud data of the stone arch bridge comprehensively and accurately,and to realize 3D modeling of stone arch bridge. Thus,providing basic data for monitoring,strengthening and restoring the geometric structure of the stone arch bridge.

关 键 词：地面激光扫描 激光点云 古石拱桥 点云数据处理 NURBS 

分 类 号：TN249[电子电信—物理电子学]