Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B1, 735-740, 2016
http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLI-B1/735/2016/
doi:10.5194/isprs-archives-XLI-B1-735-2016
 
06 Jun 2016
TUNNEL POINT CLOUD FILTERING METHOD BASED ON ELLIPTIC CYLINDRICAL MODEL
Ningning Zhu1, Yonghong Jiaa1, and Lun Luo2 1School of Remote Sensing and Information Engineering, 129 Luoyu Road Wuhan University, 430079 Wuhan, Hubei Province, China
2China Transportation Telecommunications & Information Center, 100010 Beijing, China
Keywords: Elliptic Cylindrical Model, Point Cloud Filtering, Tunnel Central Axis, Non-points, Regional Segmentation Abstract. The large number of bolts and screws that attached to the subway shield ring plates, along with the great amount of accessories of metal stents and electrical equipments mounted on the tunnel walls, make the laser point cloud data include lots of non-tunnel section points (hereinafter referred to as non-points), therefore affecting the accuracy for modeling and deformation monitoring. This paper proposed a filtering method for the point cloud based on the elliptic cylindrical model. The original laser point cloud data was firstly projected onto a horizontal plane, and a searching algorithm was given to extract the edging points of both sides, which were used further to fit the tunnel central axis. Along the axis the point cloud was segmented regionally, and then fitted as smooth elliptic cylindrical surface by means of iteration. This processing enabled the automatic filtering of those inner wall non-points. Experiments of two groups showed coincident results, that the elliptic cylindrical model based method could effectively filter out the non-points, and meet the accuracy requirements for subway deformation monitoring. The method provides a new mode for the periodic monitoring of tunnel sections all-around deformation in subways routine operation and maintenance.
Conference paper (PDF, 1411 KB)


Citation: Zhu, N., Jiaa, Y., and Luo, L.: TUNNEL POINT CLOUD FILTERING METHOD BASED ON ELLIPTIC CYLINDRICAL MODEL, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B1, 735-740, doi:10.5194/isprs-archives-XLI-B1-735-2016, 2016.

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