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Sensors 2017, 17(9), 2055;

Railway Tunnel Clearance Inspection Method Based on 3D Point Cloud from Mobile Laser Scanning

China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China
School of International Software, Wuhan University, No. 129, Luoyu Road, Wuhan, China
School of Remote Sensing and Information Engineering, Wuhan University, No. 129, Luoyu Road, Wuhan, China
State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing (LIESMARS), Wuhan University, No.129,Luoyu Road, Wuhan, China
Key Laboratory for National Geographic Census and Monitoring, National Administration of Surveying, Mapping and Geoinformation, Wuhan University, No.129, Luoyu Road, Wuhan, China
Authors to whom correspondence should be addressed.
Received: 12 July 2017 / Revised: 27 August 2017 / Accepted: 2 September 2017 / Published: 7 September 2017
(This article belongs to the Special Issue Sensors for Transportation)
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Railway tunnel clearance is directly related to the safe operation of trains and upgrading of freight capacity. As more and more railway are put into operation and the operation is continuously becoming faster, the railway tunnel clearance inspection should be more precise and efficient. In view of the problems existing in traditional tunnel clearance inspection methods, such as low density, slow speed and a lot of manual operations, this paper proposes a tunnel clearance inspection approach based on 3D point clouds obtained by a mobile laser scanning system (MLS). First, a dynamic coordinate system for railway tunnel clearance inspection has been proposed. A rail line extraction algorithm based on 3D linear fitting is implemented from the segmented point cloud to establish a dynamic clearance coordinate system. Second, a method to seamlessly connect all rail segments based on the railway clearance restrictions, and a seamless rail alignment is formed sequentially from the middle tunnel section to both ends. Finally, based on the rail alignment and the track clearance coordinate system, different types of clearance frames are introduced for intrusion operation with the tunnel section to realize the tunnel clearance inspection. By taking the Shuanghekou Tunnel of the Chengdu–Kunming Railway as an example, when the clearance inspection is carried out by the method mentioned herein, its precision can reach 0.03 m, and difference types of clearances can be effectively calculated. This method has a wide application prospects. View Full-Text
Keywords: mobile laser scanning (MLS); point cloud; railway tunnel clearance; clearance coordinate system; tunnel cross section mobile laser scanning (MLS); point cloud; railway tunnel clearance; clearance coordinate system; tunnel cross section

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Zhou, Y.; Wang, S.; Mei, X.; Yin, W.; Lin, C.; Hu, Q.; Mao, Q. Railway Tunnel Clearance Inspection Method Based on 3D Point Cloud from Mobile Laser Scanning. Sensors 2017, 17, 2055.

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