An automation 3-D modeling method was put forward based on projection transformation of point cloud coordinate.On the basis of space geometric features of mine roadway, 3-D point cloud was transformed to 2-D discrete points by cylindrical plane projec-tion, then triangulation was applied based on sub-rule algorithm, topological relation of 2-D, 3-D point cloud and triangular net were saved at the same time, 3-D roadway model was rebuilt at the end.An original experimental model was developed based on it.Laser scanning and 3-D rebuilt experiment was applied in one section of roadway of mine at home, 3-D model was rebuilt successfully.The results showed that the method laser point cloud automatic processing roadway single station and 3-D rebuilt method not only suit for mine, but also could be applied in other underground project, such as 3-D modeling of sub way tunnel.%基于点云坐标投影转换,提出了一种自动化的巷道三维建模方法.该方法依据矿山巷道的空间几何特征,采用圆柱面投影将三维点云转换为二维离散点,然后应用分治算法进行三角剖分,同时保存二三维点云及三角网之间的拓扑关系,最后重建三维巷道模型.基于此方法,开发了一个实验原型系统,并针对国内地下矿山的一段巷道开展了激光扫描和三维重建实验,成功地重建了巷道三维模型.实例结果表明,本文所提出的适用于巷道单站点激光点云的自动处理和三维重建的方法不仅仅局限于矿山应用,还可进一步推广应用于其他地下工程,如地铁巷道的三维建模等.
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