单景扫描点云数据网模型的构建方法研究

Research on Mesh Model Reconstruction for One Station Terrestrial Laser Scanning Point Cloud

摘要: 本文主要对点云数据网模型的构建方法进行研究，探讨点云数据构网的方法——基于球面投影构网算法以及基于空间三角的构网算法。本文首先分析了激光扫描数据的采集原理和数据基本特点，通过研究以上两种构网方法的优势与不足，考虑到单站地面激光扫描点云数据的特点，具体给出了空间三角网生长算法的模型并应用于实践。该算法首先利用中心投影的方式将单站激光扫描点云数据投影到一个球面上，在球面上进行构网，这样保证了点之间的正确邻接关系；然后根据空间Delaunay构网条件，制定了四个限制条件来进行选点构网；最后在AUTOCAD平台下结合VBA语言，以具体雕像为例，实现了空间三角网模型建立。

Abstract: This paper focuses on the method of constructing model with point clouds. It introduces the me- thod of the based on the spherical projection algorithm and the based on spatial triangle algorithm. Firstly analyzed laser scanning data collection principle and basic characteristics of data. By exploring the merit and demerit of above two kinds of methods, and considering the features of the single stand ground laser scanning point cloud, specifically introduce the spatial triangle mesh growth model. Firstly this algorithm makes the point cloud data onto a sphere with central projection, making the mesh on the sphere to ensure the correct adjacency relations between the points; then according to the space Delaunay analyzed, making four limiting conditions to choose point and constitute mesh. Finally, using the VBA development to realize the establish- ment.