A method for automatically extracting the elevation of existing track tops using 3D laser point clouds
A three-dimensional laser and automatic extraction technology, which is applied in the direction of railway vehicle shape measuring instrument, railway car body parts, transportation and packaging, etc., can solve the problems of many noise points and huge data volume, and the method is simple, easy to implement, and improves accuracy Effect
Active Publication Date: 2019-01-04
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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However, the 3D point cloud obtained by using 3D laser scanning movement is only unstructured discrete points, which are disturbed on the orbital surface, have many noise points, and the amount of data is extremely large
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[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0017] refer to figure 1 , the present invention uses a three-dimensional laser point cloud to automatically extract the existing line rail top elevation method, comprising the following steps:
[0018] 1) Segment the three-dimensional laser point cloud of the track from the original scanning laser point cloud, determine the rough centerline of the track according to the track data of the three-dimensional laser scanning system, and use this centerline to generate a buffer zone according to the track spacing, and remove , A large amount of 3D laser point cloud data on both sides of the right track makes the track extraction range more accurate.
[0019] Convert the 3D laser point cloud in the orbital area to the elevation projection space. The characteristic indicators used in this process are:
[0020] ①Projection sampling interval, for the projectio...
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The invention discloses a method for automatically extracting the existing line rail top elevation through three-dimensional laser point clouds. Rails are separated from the scattered and high-densitypoint clouds, the rail top elevation is calculated, and technical support is provided for three-dimensional laser scanning mobile surveying and mapping in existing line surveying, detecting and informatization. The method comprises the following steps that (1) the rail three-dimensional laser point clouds are divided from original scanning laser point clouds; (2) according to the rail three-dimensional laser point clouds, the center lines of the left rail and the right rail are calculated; (3) according to the center line mileage, a left rail mileage coding system and a right rail mileage coding system are established; (4) the rail top surface element three-dimensional laser point clouds of the left rail and the right rail are extracted; and (5) the rail top surface element three-dimensional laser point clouds are subjected to rail top elevation adjustment calculation, and the elevation average value of the rail top surface element three-dimensional laser point clouds, except elevation outliers and noisy points, is calculated, namely the elevation average value is the corresponding rail top elevation value.
Description
technical field [0001] The invention belongs to the technical field of existing line railway survey, especially for the automatic extraction of track top elevation from high-density three-dimensional laser point cloud data obtained by land-based laser radar, so as to realize the automatic extraction and height of left and right rail elevations in the survey of existing railway lines. Precision Robust Computation. Background technique [0002] The survey of the existing railway line is an important part of railway maintenance and construction of the second line. The traditional static survey of the existing railway line adopts the contact survey with the existing railway center line as the basic control line, such as leveling survey, GPS survey, total station survey Directly measuring the elevation of the track surface, etc., has great interference to the operation, low safety, and low data collection efficiency. Three-dimensional laser mobile scanning can quickly obtain hig...
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IPC IPC(8): B61K9/08
CPCB61K9/08
Inventor 周玉辉梅熙卢建康杨锋胡庆武周世明林春峰冯树波黄华平陈海军
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD