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Method for ensuring drainage box culvert three-dimensional point cloud coordinate conversion precision

A technology of coordinate conversion and 3D point cloud, applied in the field of 3D laser scanning measurement, can solve the problems of large error and errors in the coordinate conversion of linear 3D point cloud, and achieve the effects of good structural stability, wide applicability and high precision

Active Publication Date: 2022-05-13
POWERCHINA XIBEI ENG
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method to ensure the conversion accuracy of the three-dimensional point cloud coordinates of the drainage box culvert, and solve the problem that the existing linear three-dimensional point cloud coordinate conversion error is too large or wrong

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  • Method for ensuring drainage box culvert three-dimensional point cloud coordinate conversion precision
  • Method for ensuring drainage box culvert three-dimensional point cloud coordinate conversion precision
  • Method for ensuring drainage box culvert three-dimensional point cloud coordinate conversion precision

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Embodiment Construction

[0029] Now give the preferred embodiment and describe the present invention in detail in conjunction with the drawings, see Figure 1 to Figure 5 .

[0030] The present invention provides a method for ensuring the conversion accuracy of three-dimensional point cloud coordinates of drainage box culverts, comprising the following steps:

[0031] Step 1. According to the distribution and quantity of various openings on the ground of the box culvert, divide the drainage box culvert into several small sections. The length of each box culvert should not exceed 500m, and the number of openings should not be less than 4. The spacing is not greater than 100m, and when the number and spacing of the existing openings do not meet the above conditions, artificial openings can be dug on the ground directly above the box culvert where conditions permit. ;

[0032] Step 2, respectively set the positioning target inside the culvert and the positioning target outside the culvert: the position...

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Abstract

The invention discloses a method for ensuring three-dimensional point cloud coordinate conversion precision of a drainage box culvert. The method comprises the following steps of: dividing a box culvert into sections, respectively arranging an in-culvert positioning target and an out-culvert positioning target, acquiring in-culvert point cloud data and out-culvert point cloud data, establishing a relation, and acquiring three-dimensional coordinates of the positioning targets in a national geodetic coordinate system; three-dimensional coordinates of a positioning target in a scanning coordinate system are extracted and are in one-to-one correspondence with three-dimensional coordinates of the positioning target in a national geodetic coordinate system, and the problem of large errors or errors caused by horizontal side rolling inclination of linear point cloud coordinate conversion is effectively solved through the six steps of joint conversion of intra-culvert point cloud data and extraculvert point cloud data. The method is advantaged in that a small linearization rotation angle is avoided, correlation among rotation matrix elements is taken into consideration, drainage buried culvert three-dimensional point cloud coordinate conversion precision is guaranteed, and high precision, strong stability, wide applicability and the like are realized.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional laser scanning measurement in the technical field of underground space civil engineering, and specifically relates to a method for ensuring the conversion accuracy of three-dimensional point cloud coordinates of drainage box culverts. Background technique [0002] Drainage box culvert is a kind of urban underground drainage pipe, which belongs to the limited space of closed or semi-closed. The culvert used for drainage is built in the shape of a reinforced concrete box, consisting of one or more square or rectangular sections. The span of a single box culvert is not greater than 4m, and inspection wells are arranged on the ground. When using three-dimensional laser scanning technology to scan and measure the inside of the box culvert, due to the complexity of the culvert environment and the limitation of implementation conditions, it is difficult to measure and locate the target in the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C15/00
CPCG01C15/002
Inventor 吕宝雄高徐军张旭杰赵延岭杨振胤许立媛王磊
Owner POWERCHINA XIBEI ENG
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