Abstract:In order to get accurate 3D geometric information of the tunnel, the extraction of the central axis of the tunnel plays a key role. Firstly, the data of the tunnel point cloud are pretreated and divided into different sections according to the direction of the tunnel. Then, the less accurate central axes are extracted according to the vertical relationship between the axes and normal line of the surface point cloud. Finally, the more accurate axis is extracted by using cylindrical multi-segment fitting. The experimental results show that the proposed method has good applicability to straight and curved circular tunnels, and the algorithm is reliable and accurate.
JING Haifeng,LI Guangyun,WANG Li et al. Research on Extracting Central Axis of Tunnel Based on Multi-Segment Cylinder Fitting[J]. jgg, 2018, 38(2): 211-215.