A Fast Extraction Method of Tunnel Section Based on Raw Point Cloud Data

An extraction method and technology of point cloud data, applied in cross-section drawing, image data processing, measuring devices, etc., to achieve accurate extraction, rigorous theory, and easy implementation

Active Publication Date: 2020-04-10
HUNAN LIANZHI BRIDGE & TUNNEL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for fast extraction of tunnel sections based on original point cloud data to solve the problem of fast extraction of tunnel sections

Method used

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  • A Fast Extraction Method of Tunnel Section Based on Raw Point Cloud Data
  • A Fast Extraction Method of Tunnel Section Based on Raw Point Cloud Data
  • A Fast Extraction Method of Tunnel Section Based on Raw Point Cloud Data

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Embodiment 1

[0043] see Figure 1~Figure 7 , a method for quickly extracting tunnel sections based on original point cloud data, this embodiment is applied to the monitoring and measurement of a highway tunnel in Guangdong.

[0044] A method for quickly extracting tunnel sections based on original point cloud data includes the following steps:

[0045] Step 1: Collect the tunnel section design drawing and the route horizontal curve element table and vertical curve element table of the section where it is located, as well as the original coordinate point cloud data of the tunnel surface acquired by scanning , Represents a point cloud, where the subscript Indicates natural numbers; point cloud data It belongs to the left-handed coordinate system, that is, the x-axis points to the direction of true north, and the y-axis points to the direction of true east.

[0046] Step 2: Calculate the slope k at the section S to be extracted, and sort the original coordinate point cloud data Dr alo...

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Abstract

The invention provides a tunnel section rapid extraction method based on original point cloud data. The method comprises the following steps: step 1, scanning acquired tunnel surface original coordinate point cloud data Dr; step 2, calculating the slope k of the section S to be extracted, and obtaining sorted point cloud data Ds according to the value of k; step 3, roughly extracting the point cloud data to obtain point cloud data Dc; step 4, performing fine extraction on the point cloud data to obtain a point set Dp of the section; and step 5, converting the extracted section point set Dp into a plane coordinate system. According to the method, collecting a tunnel section design drawing and a horizontal curve element table and a vertical curve element table of an interval where a tunnel is located are collected, the center coordinate and the normal vector of the to-be-extracted section is calculated, two times of extractions, namely rough extraction and fine extraction, are performedand 90% of point cloud data can be filtered out in rough extraction, so that the calculation efficiency is improved, the extracted section coordinate data is finally obtained, and the extracted section coordinate data can be converted into a plane coordinate system according to needs.

Description

technical field [0001] The invention relates to the technical field of three-dimensional laser scanning tunnel monitoring and measurement, in particular to a method for quickly extracting tunnel sections based on original point cloud data. Background technique [0002] Monitoring and measurement technology is an important part of tunnel construction, an important technical means to grasp the surrounding rock dynamics and verify the rationality of the support structure, and an important basis for determining a reasonable support time. The importance of monitoring and measurement technology is self-evident, and the management unit has also invested a lot of manpower and material resources. However, the monitoring and measurement methods have not been greatly developed in the past two decades, and mechanical measurement methods such as precision levels and convergence gauges are still used. , the efficiency is extremely low, and the measurement results are seriously disturbed b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/00G01B11/00G01C7/06
CPCG01B11/00G01C7/06G06T3/0031
Inventor 吴勇生曾雄鹰龙兴
Owner HUNAN LIANZHI BRIDGE & TUNNEL TECH
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