基于规则格网 DEM 线状矢量要素三维可视化方法

摘要

如何在三维地形表面无缝叠加矢量要素是三维地理信息系统、三维制图等领域面临的一个重要问题。目前矢量要素与三维地形无缝叠加的研究主要集中在矢量数据基于三维地形的实时显示上面，面向三维制图的研究相对较少，导致矢量要素的显示过于简单，地图要素信息传输受限。文中提出一种基于几何法的线状矢量数据与规则格网DEM无缝叠加算法，并通过纹理映射的方式实现矢量数据符号化，最后以道路数据为例进行实验，验证了方案的可行性。%It is one of the key issues that the seamlessly overlay vector elements are used in three‐dimensional(3D) terrain surface in 3D geographic information systems (GIS ) ,and 3D graphics .Currently the research on seamlessly superposition vector element and 3D terrain mainly aim at vector data real‐time display on 3D terrain ,but few studies on 3D graphics .As a result ,the vector element display is too simple , leading to the information of map elements transferring restrictedly .A linear vector data and Grid DEM seamlessly overlay method is proposed based on geometric algorithm ,and the vector data symbolization is achieved by texture mapping .Finally taking the road data for example ,it verifies the feasibility of the method .