Railway Section Extraction Method based on Point Cloud Digital Elevation Model
In view of the particularity of the railway industry,the general laser point cloud processing software cannot be deeply integrated with railway engineering,which causes problems such as low auto-matic processing efficiency and weak technical function support.This paper proposes a method of railway section extraction based on point cloud digital elevation model.This method obtains the section name and node plane coordinates from the floor plan and railway line design model,loads massive tile fine point cloud data based on the AutoCAD design platform,constructs a digital elevation model by using the dis-tributed local Delaunay triangulation algorithm,establishes the close fitting mapping relationship between the discrete sampling point mode and the smooth surface.And then this method obtains the section eleva-tion information according to spatial distance interpolation,and completes the data check,thinning and format conversion in batches,and finally draws the section map.The example shows that this method has high cross-section extraction efficiency,the obtained cross-sections can meet the accuracy requirements,which provides a useful reference for railway construction survey.
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