车载LiDAR海量点云数据管理与可视化研究

Data Management and Visualization of Mobile Laser Scanning Point Cloud

为了支持车载移动激光扫描点云数据的高效管理与快速可视化,提出了一种适用于车载海量点云的数据组织方法。该方法将原始点云数据分段后生成轨迹信息用于快速索引,分别对每段数据建立基于八叉树结构的LOD(levels of detail)索引,并采用多线程动态调度技术实现基于视点的海量点云渲染与漫游,显著提高了车载点云数据的调度效率。实验结果证明该点云数据组织方法是一种适合车载点云数据的高效管理方法。

This paper proposed an organization method of laser point cloud data for the efficient management and rapid visualization of the massive point cloud data of vehicle-mounted laser scanner.In this paper,both the original point cloud data and its trajectory are sectioned for the fast indexing firstly,then the LOD（levels of details）index of each section is build based on octree structure.With a tile type and multiresolution storage mode based on folder system,the depth of octree structure is represented by the level of folder directory,and in every node folder,the corresponding point cloud data file and its node properties file are both include.The storage method of this paper decreases the preprocessing time greatly and can support concurrent access owing to mutually independence of each node.Moreover,with the application of view frustum culling technology and multi-thread dynamic dispatch technology,the rendering and roaming of massive point cloud can realize real time updating according to viewpoint change,which significantly improves the dispatch efficiency of vehicle-mounted laser point cloud data.In the experiment,our method was compared with several popular software of point cloud data processing（e.g.XGRT,Quick Terrain Reader）on the data dispatch.The results show our method has obvious advantage on storage capacity,data access time,memory footprint,rendering frame rate and so on,it indicates our method is effective for the management of vehicle-mounted laser point cloud data and can improve the production efficiency for indoor-work of vehicle-mounted laser point cloud data processing.