基于球面DQG的矢量与地形数据无缝集成  

Seamless Integration of Vector and Terrain Data Based on Degenerate Quadtree Grid

作　　者：孙文彬[1] 胡佰林[1,2] 王洪斌[1] 王磊[1] 吴亚军[1] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]河南理工大学矿山空间信息技术国家测绘局重点实验室,河南焦作454000

出　　处：《地理与地理信息科学》2012年第1期39-42,共4页Geography and Geo-Information Science

基　　金：国家自然科学基金项目(41171306);中国矿业大学(北京)大学生创新计划项目(1102209y)

摘　　要：现有的全球大规模空间数据可视化系统主要侧重于影像和地形数据的综合表达,针对矢量与地形的集成可视化能力相对较弱。该文以球面退化四叉树格网(Degenerate Quad-tree Grids,DQG)为基础,通过DQG格网的三角化过程构建了地表DEM模型,并提出了从矢量线对象到地形格网表面的映射方法。采用GTOPO30数据集和国界矢量数据进行了相关实验,结果表明:该方法能实现矢量数据与多分辨率DEM的无缝集成,并能有效地避免矢量对象"悬浮"和"入地"等现象。Existing visualization systems of global-scale spatial data mainly focus on the integrating representation of DEM and image data on sphere, but less are capable to integrate vector and terrain data effectively. Degenerate Quadtree Grid （DQG） is employed to model the global DEM with the method of transferring DQG into triangles in this paper. The algorithm of mapping vector data onto DEM is developed based on geometry computation. An experiment of integrating GOTOP30 and country boundary data is carried out. The result indicates that seamless integration of vector and terrain data can be achieved and the is sues of ＂floating＂ and ＂immersing＂ on vector objects can be solved well and effectively by the method.

关 键 词：退化四叉树格网 矢量数据 地形数据 数据集成 全球空间格网 

分 类 号：P208[天文地球—地图制图学与地理信息工程]