An efficient rendering method for large vector data on large terrain models  

作　　者：YANG Ling ZHANG LiQiang KANG ZhiZhong XIAO ZhiQiang PENG JunHuan ZHANG XingMing LIU Liu 

机构地区：[1]State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing Applications of Chinese Academy of Sciences, Beijing 100875, China [2]Department of Geodesy and Geomaties, School of Land Science and Technology, China University of Geosciences, Beijing 100083, China

出　　处：《Science China(Information Sciences)》2010年第6期1122-1129,共8页中国科学（信息科学）（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 60502008);the National High-Tech Research & Development Program of China (Grant Nos. 2006AA12Z220,2007AA12Z226);Program for New Century Excellent Talents in University (Grant No. NCET-07-0099)

摘　　要：This paper presents an efficient way to render large-scale vector maps on level-of-detail （LOD） digital elevation models （DEMs）. By using the frame buffer and Voronoi diagram, we achieve a rapid simplification of large-scale vector maps while keeping their original topological relationships. With the simplified maps, we establish level-of-detail vector map models. In the detailed level, we use the stencil shadow volume approach to render the map accurately, and in the coarse level we use substitute techniques to render the map approximately yet more quickly. The method proposed in this paper is universally applicable to rendering vector maps on various LOD terrain models, and the overlaying performance is independent of the complexity of underlying terrain surfaces. By use of the view frustum culling and sub-region index techniques, the impact of complexity of vector maps is reduced, and the rendering time is restricted to a certain scope. Thereby, we can achieve seamless and rapid rendering of large-scale vector maps on LOD terrain surfaces.This paper presents an efficient way to render large-scale vector maps on level-of-detail （LOD） digital elevation models （DEMs）. By using the frame buffer and Voronoi diagram, we achieve a rapid simplification of large-scale vector maps while keeping their original topological relationships. With the simplified maps, we establish level-of-detail vector map models. In the detailed level, we use the stencil shadow volume approach to render the map accurately, and in the coarse level we use substitute techniques to render the map approximately yet more quickly. The method proposed in this paper is universally applicable to rendering vector maps on various LOD terrain models, and the overlaying performance is independent of the complexity of underlying terrain surfaces. By use of the view frustum culling and sub-region index techniques, the impact of complexity of vector maps is reduced, and the rendering time is restricted to a certain scope. Thereby, we can achieve seamless and rapid rendering of large-scale vector maps on LOD terrain surfaces.

关 键 词：large-scale vector maps LODs VIEW-DEPENDENT VISUALIZATION 

分 类 号：P208[天文地球—地图制图学与地理信息工程] TP391.41[天文地球—测绘科学与技术]