线路工程带状走廊三维地形构建及轻量化研究

基于线路工程带状走廊三维地形海量空间数据的特点,总结了线路工程数字高程模型(DEM,Digital Elevation Model)的获取方式和数据来源,对三维地形建模方法及其轻量化处理方式进行了研究。分别通过方格网和三角网2种模式对试验路段地形进行了构建,选取Delaunay算法进行三角剖分,并应用边缘收缩和点删除法对数据进行了轻量化处理。试验结果表明,不规则三角网模型能用更少的数据来合理地表达复杂的地表形态;Delaunay逐点插入算法更适用于线路工程三维地形建模;点删除法对线路走廊带曲面模型的简化效果更好,主要参数未发生改变且失真较小。

Three-dimensional terrain construction and lightweight of railway line engineering ribbon corridor

Based on the characteristics of massive spatial data of 3D terrain in the ribbon corridor of the railway line engineering, this paper summarized the acquisition methods and data sources of the railway line engineering DEM(Digital Elevation Model), and studied the 3D terrain modeling methods and lightweight processing methods.The terrain of the test railway section was constructed by two modes of grid and triangle network respectively. Delaunay algorithm was selected to triangulate, and edge contraction and point deletion were used to lightweight the data.Experiments show that the Triangulated Irregular Network(TIN) model can reasonably express complex morphological surface with less data. Delaunay point-by-point insertion algorithm is more suitable for railway engineering three-dimensional terrain modeling. The methods of edge shrinkage and point deletion are used to lighten the data simplification. The comparison shows that the point deletion method is more effective, the main parameters have not changed and the distortion is less.