Subway track surface three-dimensional center line generation method

Abstract

The invention provides a subway track surface three-dimensional center line generation method, which comprises the following steps: processing an acquired longitudinal section diagram, and extractingcorresponding information of mileage and elevation of the center line of the subway track surface; carrying out ordering processing on each line drawing of the two-dimensional center line of the subway track surface to obtain a starting point of each line drawing along the line direction and a corresponding starting point mileage, and calculating the actual mileage of each line drawing end point according to the starting point mileage and the actual length of each line drawing; matching the line drawing endpoints with the longitudinal section information according to a mileage equality principle to obtain elevations corresponding to the line drawing endpoints; for any point in the line drawing, determining the elevation corresponding to the point according to the actual mileage of the point and a linear interpolation method; and further obtaining the three-dimensional center line of the subway track surface. The method has the advantages that the method is simple and easy to operate, the obtained three-dimensional center line can be combined with tunnel point cloud data to calculate various cross sections, and the production efficiency of tunnel clearance measurement, operation monitoring and other work is improved.

Description

technical field [0001] The invention relates to the field of subway construction, in particular to a method for generating a three-dimensional centerline of a subway track surface. Background technique [0002] The centerline of the subway track surface is the basis for applications such as subway boundary measurement and operation monitoring. Generally, on the subway centerline, according to the curve type and monitoring requirements, and the spacing required by the monitoring, high-precision total stations are used to measure the tunnel cross-section information. This method is inefficient and cannot express difference information intuitively. With the development of the times, 3D laser scanning technology has developed rapidly. It can quickly obtain the 3D surface information of the target object with high precision. It is called "real scene replication technology". The information is copied to the computer, and on this basis, the virtual measurement of the tunnel is car...

AI Technical Summary

Problems solved by technology

However, in reality, the design centerline of the subway track is still dominated by two-dimensional expressions, so it cannot be directly used for tunnel cross-section measurement

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