Line cross section automatic extraction method based on irregular triangulation network

Abstract

The invention relates to a line cross section automatic extraction method based on an irregular triangulation network. The method comprises the steps of: firstly determining coordinates, tangent linesand cross section directions of line section mileage; then extracting point elevation on an irregular triangulation network model by utilizing ArcGIS Object API; and finally outputting section data and a curve graph in a text form. The coordinates, tangent lines and cross section directions of mileage points can be automatically calculated; the elevation data are extracted according to fixed intervals; and a user can quickly obtain cross section data and automatically draw a picture only through a small amount of indoor data preparation work. Therefore, the operation mode of a traditional mode is changed, a large amount of field operation is transferred into a room, field safety accidents are avoided, and meanwhile the working efficiency is improved.

Description

technical field [0001] The invention belongs to the field of line engineering survey, in particular to a method for automatically extracting line cross-sections based on irregular triangular networks. Background technique [0002] In the survey of linear engineering, such as railways and highways, cross-sectional surveying and mapping along the line is an important part of the preliminary survey. The traditional surveying and mapping method is to use a total station or GPS-RTK to collect the coordinates and elevations of points on the actual cross section in the field, and then map them in the office. This method requires a lot of manpower and has a low degree of automation. [0003] Triangulated Irregular Network (TIN, Triangulated Irregular Network) model uses a series of connected triangles to fit the surface or other irregular surfaces. It is often used to construct digital ground models, especially digital elevation models. Irregular TIN models such as figure 1 shown. ...

AI Technical Summary

Problems solved by technology

The irregular triangulation model can be used as the digital surface model of the target area. Since the existing photogrammetry and point cloud processing software is general-purpose software, there is no business function of needle line engineering and does not support secondary development, while GIS software can realize irregular The import, export and analysis of the triangular network, the elevation at any coordinate point can be easily obtained by using GIS software on the model, which provides the necessary software and data support for the automatic extraction of the cross-section of the line engineering

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