Application and Accuracy Evaluation of Mobile 3D Laser Scanning in Subway Operation and Maintenance
In view of the problem that the maintenance of the operating subway is limited by the time window,and the tunnel status cannot be obtained quickly and accurately,this paper obtains the subway tunnel point cloud data based on the mobile 3D laser scan-ning system,and through point cloud denoising,point cloud simplification,target fitting,mileage correction,centerline extraction,section extraction and fitting and other methods,obtains the maximum diameter of the subway tunnel,catenary conductor height,e-quipment gauges,tunnel disease and other relevant status information.The accuracy of the results is evaluated.The experimental re-sults show that the overall accuracy of obtaining the maximum tunnel diameter based on mobile 3D laser scanning is better than 3 mm,of which 85.17%of the residuals is within 2 mm;the maximum,minimum and average residual values of the obtained height results and the altimeter measurement results are 3.4 mm,-4.7 mm,and 0.39 mm respectively;the overall accuracy of the obtained equip-ment gauge results is better than 5 mm,of which 84.13%of the residuals are within 3 mm;the results of manual on-site review of tunnel disease information obtained have good consistency.
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