Abstract
The railway structures need constant monitoring and maintenance to ensure the train circulation safety. Quality information concerning the infrastructure geometry, namely the three-dimensional linear elements, are crucial for that processes. Along with this work, a method to automated extract three-dimensional linear elements from point clouds collected by terrestrial mobile LiDAR systems along railways is presented. The proposed method takes advantage of the stored cloud point’s attributes as an alternative to complex geometric methods applied over the point’s cloud coordinates. Based on the assumption that the linear elements to extract are roughly parallel to the rail tracks and therefore to the system trajectory, the stored scan angle value was used to restrict the number of cloud points that represents the linear elements. A simple algorithm is then applied to that restricted number of points to get the three-dimensional polylines geometry. The obtained values of completeness, correctness and quality, validate the use of the methodology for linear elements extraction from mobile LiDAR data gathered along railway environments.
Highlights
The railway infrastructure monitoring and surrounding environment maintenance are essential to ensure the train circulation safety
In order to test the proposed methodology for the extraction of three-dimensional lines in a railway environment, a point cloud obtained by an SLMT installed in a train was used with the sensor RIEGL VQ-250
Throughout this work, a different approach for three-dimensional linear elements extraction from mobile LiDAR point clouds in railway environments is presented. This takes advantage of the linear elements that are being extracted, which are roughly parallel to the railway tracks and to the sensor system trajectory
Summary
The railway infrastructure monitoring and surrounding environment maintenance are essential to ensure the train circulation safety. Preventive interventions are crucial, namely due to the gauge monitoring, ballast assessment and surrounding slopes maintenance. In order to define that interventions, it is necessary to have a good knowledge of the railway geometry and surrounding environments. Three-dimensional modelling of the railway’s surrounding environment is a constant need in order to restore safety levels due to the inevitable wear and tear of the railroad over the time. Based on the symmetry of the standard railway construction profile, a rough parallel set of linear elements surrounds the rail track, and namely the ballast limits, electrical lines, break-lines, etc., can be determined. The three-dimensional representation of those linear elements is fundamental to the railroad and surrounding environment modelling
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