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  file mapping
    Based on existing three dimensional road model method, a new method is proposed in this paper for the establishment of integrated road model by combining the design surface topographical surface. The theory of inserting point and restraining line in constrained Delaunay triangulation, principle of incremen()tal insertion algorithm, and technology of Windows file mapping were used in the development of the method for quick establishment of the model of road design surface topographical surface.
    在系统分析了现有的道路三维模型构建方法的基础上,提出了一种将道路设计面模型与地形表面模型融为一体的整体模型构建方法,该方法基于约束Delaunay三角网内插入点和约束边的理论,利用逐点插入算法原理和Windows文件映射技术,快速实现了道路设计面与地形表面的整体建网。
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The features and demands of DTM in highway engineering are studied. An integral method of building DTM is presented, and some key technologies are developed. These key technologies are windows file mapping, spatial grid index and a fast algorithm of constructing triangulation irregular net(TIN) based on the incremental insertion algorithm. The method presented in this paper have some advantages such as limitless number of points, high efficiency of constructing TIN, fast inquiry and continuous sealless DTM ete....

The features and demands of DTM in highway engineering are studied. An integral method of building DTM is presented, and some key technologies are developed. These key technologies are windows file mapping, spatial grid index and a fast algorithm of constructing triangulation irregular net(TIN) based on the incremental insertion algorithm. The method presented in this paper have some advantages such as limitless number of points, high efficiency of constructing TIN, fast inquiry and continuous sealless DTM ete.

研究了公路对数字地面模型的要求及算法 ,提出了数字地面模型的整体建立方案 ,并解决了其中的关键技术 ,即以 Windows文件映射技术管理数据 ,以栅格为基础的空间数据索引系统 ,基于逐点插入算法的快速构网技术。所建立的数字地面模型具有对数据量不限 ,执行效率高 ,查询速度快 ,连续无缝等特点。

Based on existing three dimensional road model method, a new method is proposed in this paper for the establishment of integrated road model by combining the design surface topographical surface. The theory of inserting point and restraining line in constrained Delaunay triangulation, principle of incremen()tal insertion algorithm, and technology of Windows file mapping were used in the development of the method for quick establishment of the model of road design surface topographical surface. With the integrated...

Based on existing three dimensional road model method, a new method is proposed in this paper for the establishment of integrated road model by combining the design surface topographical surface. The theory of inserting point and restraining line in constrained Delaunay triangulation, principle of incremen()tal insertion algorithm, and technology of Windows file mapping were used in the development of the method for quick establishment of the model of road design surface topographical surface. With the integrated road model, three dimensional roam of the view of the road can be realized, facilitating the evaluation of line shape with respect to topography.

在系统分析了现有的道路三维模型构建方法的基础上,提出了一种将道路设计面模型与地形表面模型融为一体的整体模型构建方法,该方法基于约束Delaunay三角网内插入点和约束边的理论,利用逐点插入算法原理和Windows文件映射技术,快速实现了道路设计面与地形表面的整体建网。应用道路整体模型可以实现道路景观的三维漫游,评价三维立体线形以及与周围地形的配合情况。

 
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