说明：  此信提出一种高效的两步分割方法，用于通过所述移动激光扫描器收集大规模三维点云数据。首先，一个新的扫描线的基于地面分割算法被设计为过滤对应于以高精度地面点。
(This letter proposes an efficient two-step segmentation method for large-scale 3-D point cloud data collected by the mobile laser scanners. First, a new scan-line-based ground segmentation algorithm is designed to filter the points corresponding to the ground with high accuracy. )