Newly-built railway cross measurement method based on unmanned aerial vehicle laser point cloud and image fusion

Abstract

The invention relates to a newly-built railway cross measurement method based on unmanned aerial vehicle laser point cloud and image fusion, and belongs to the technical field of newly-built railway engineering survey and construction, and the method comprises the following steps: S1, obtaining and preprocessing railway band-shaped unmanned aerial vehicle aerial photography data, and making a color point cloud and a live-action three-dimensional scene; s2, design line position arrangement and cross measurement position determination are carried out, and color point clouds at the cross measurement positions are segmented and saved; and S3, performing crossover calculation on the curve or straight line fitted by the linear ground feature crossed with the design line position and the design line position, and outputting a crossover measurement result. According to the invention, laser point cloud and image data are obtained at the same time in a way that the unmanned aerial vehicle carries out strip-shaped aerial photography along the line, and the aerial photography data can be reused, thereby facilitating checking and archiving management of achievements; according to the invention, unmanned aerial vehicle laser point cloud and image fusion processing is adopted, so that the precision and reliability of cross measurement are greatly improved; according to the invention, a non-contact measurement mode is adopted, so that the cross measurement field workload of the traditional newly-built railway is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of new railway engineering survey and construction, and in particular relates to a new railway crossing measurement method based on the fusion of laser point cloud and image of unmanned aerial vehicle, which specifically includes railway belt-shaped unmanned aerial vehicle aerial photography data collection and data preprocessing , Design line arrangement and cross-measurement location determination, cross-measurement information extraction, etc. Background technique [0002] Railway intersection survey refers to the measurement of the intersection relationship between railway lines and pipelines, power lines and other roads (including plane relationship and elevation relationship), as well as the acquisition of geometric and physical attribute information of intersecting objects, which is an important basis for special surveying and surveying. It can provide reference for the subsequent design work of impor...

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Problems solved by technology

[0003] Usually, the cross-measurement work of the newly-built railway is carried out simultaneously with the centerline measurement. The current measurement methods mainly include the dial angle method, the polar coordinate method and the GNSS-RTK method. Quality problems in the operation process occur from time to time, and when problems occur, they can only be remedied by rework measurement, and there are certain safety hazards in areas with complex terrain

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