自由设站法在点云拼接中的应用

为方便三维点云数据的统一管理和工程应用,需要为其提供统一的坐标基准。在数据采集阶段,对于在控制点可通视的测区内,可利用后视定向的方法完成点云扫描测量工作。针对控制点无法通视的测区,本文提出基于全站仪三维自由设站控制测量的方法,建立间接设站点平差模型并进行平差,进而解算标靶点坐标,利用标靶将扫描点转换到绝对坐标系中。试验结果表明:标靶坐标的测量精度和点云拼接的精度符合要求。在测区观测条件不好的情况下,自由设站法的应用为点云拼接提供了一种可行的方法。

Application of Free Station in the Point Cloud Registration

In order to facilitate unified management and engineering application of 3D point cloud data,it is necessary to provide for a uniform coordinate reference.In the data acquisition phase,it can be used the orientation of the rear-related measurements to complete the scanning work in the area where the control points are visible.In the area where control points are invisible,it proposed a controlling surveying method based on free station of total station and establishes indirect adjustment model and adjustment,thus solving standard target coordinates and cloud point converted to the absolute coordinate system.Results show that the accuracy of the target surveying accuracy and point cloud registration are to meet the requirements.In the bad survey area,free station provides a workable solution for point cloud registration.