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

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...

AI Technical Summary

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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