Section extraction method based on point cloud mathematical model

Abstract

The invention discloses a section extraction method based on a point cloud mathematical model. The existing method for extracting the cross section by using the laser point cloud is low in automatic processing degree and low in efficiency. The method comprises the following steps: constructing a PLY-format digital elevation model by using point cloud data; interpolating the obtained section node coordinates through a specified interval along the section advancing direction to obtain encrypted node coordinates, setting section extraction options and parameters, and interpolating encrypted node elevations on a digital elevation model triangular surface by using a barycentric coordinate smooth interpolation algorithm to obtain a section; section data are checked by using middle pile data, and section nodes are thinned; and finally, performing format conversion on the section data, and drawing a section diagram. According to the software developed by the invention, the section is extracted by using a point cloud digital model under CAD, and after necessary data preparation and option parameter setting, operations such as section data extraction, checking, thinning and format conversion can be completed by one key.

Description

technical field [0001] The invention belongs to the technical field of surveying and mapping, and in particular relates to a method for extracting a section based on a point cloud digital model. Background technique [0002] At this stage, the acquisition of cross-section data mainly adopts three methods: field manual measurement, internal aerial photography stereo acquisition, and lidar point cloud extraction. The field manual measurement needs to run the point at the characteristic position of the cross section, which has low work efficiency, high labor intensity, high safety risk in complex and dangerous areas, and even the characteristic position cannot be reached. The stereoscopic collection of aerial photography in the internal industry relies on the operator to visually measure and collect feature points on the digital measurement workstation. The plane accuracy of the stereoscopic pair of aerial photography cannot be corrected by the middle pile in the field. There a...

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Problems solved by technology

Although the above method can extract horizontal and vertical sections, it does not consider the problem of the inconsistency between the extracted section and the middle pile, and because the commonly used LiDAR data processing software is a general-purpose software without an open programming interface, it cannot be deeply integrated with the line engineering section extraction business and automated processing low level, low efficiency

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