基于地面三维激光扫描技术的跨河建筑物测量

传统方法在测量桥梁等跨河建筑物时，存在精度低、耗时长等缺点。在论述三维激光扫描测量原理的基础上，提出利用地面式三维激光扫描方法对跨河建筑物进行测量。以某内河桥梁测量为例，对单站点云配准后进行整体坐标转换，获取目标点云成果，并将若干检查点的点云坐标与RTK坐标进行对比以验证精度。结果表明：地面式三维激光扫描测量成果点位精度优于6 cm，能够满足城市跨河建筑物建模的需求，可为三维激光扫描技术在市政测量方面的应用提供经验。

River-crossing structure surveying based on ground 3D laser scanning technology

The traditional surveying methods have some disadvantages,such as low accuracy and time-consuming in surveying bridge and other river-crossing structures.Based on the discussion of the principle of 3D laser scanning measurement,this paper applies the method of ground 3D laser scanning to the surveying of river-crossing structures.Taking the survey of an inland river bridge as an example,the coordinate transformation of a single site cloud after registration is carried out to obtain the results of target point cloud,and the point cloud coordinates of several checkpoints are compared with RTK coordinates to verify the accuracy.It is shown that the positional accuracy of ground 3D laser scanning technology is superior to 6 cm,which meets the requirements of urban river-crossing structure modeling.The experience could be used in the application of 3D laser scanning technology in municipal surveying.