A Hierarchical Visualization Model of the Global Terrain Based on QTM
A global multi-resolution digital elevation model (DEM) and a feasible solution for its visualization and management remains a challenging vision.In this paper a multi-resolution DEM based on the ellipsoidal triangular meshes is made to approximate to the earth surface.It was built through quaternary triangular mesh (QTM) hierarchical tessellation of the ellipsoidal surface.In order to achieve fast access,we organize the global DEM data as a hierarchy of Diamonds and indexing them based on the linear quadtree.Furthermore,a LOD is built through recursive subdivision of each Diamond,and an approach of viewpoints-based data extraction based on the neighbor-Diamond searching from the global DEM data is implemented for visualization.All this is backed with an implementation of a prototype computer system.
Quaternary Triangular Mesh (QTM) Digital elevation model (DEM) Ellipsoidal triangular meshes Hierarchical tessellation Linear quadtree
BAI Jian-jun YAN Chao-de ZHAO Xue-sheng
School of Tourism and Environment,Shanxi Normal University,199 South Changan Road,Xian 710062,Chin School of Environment and Water Conservancy Engineering,Zhengzhou University,100 Science Road,Zhengz Department of Land Science and Surveying China University of Mining and Technology (Beijing) Beijing
国际会议
第16届国际地理信息科学与技术大会(16th International Conference on GeoInformatics and the Joint Conference)
广州
英文
2008-06-28（万方平台首次上网日期，不代表论文的发表时间）