期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2008
卷号：XXXVII Part B4
页码：579-584
出版社：Copernicus Publications
摘要：This paper presents a sophisticated tile-based terrain rendering system for large-area terrain visualization. The developed system employs quadtree algorithm to create multiple levels of details (LOD) of terrain tiles. The visualization determines visible tiles by view frustum culling and renders the scene efficiently. A key issue in quadtree-based LOD generation is the thresholding for different levels. A novel thresholding scheme based on calculated ground sample distances is proposed and provides better LODs with screen resolution. In addition, a nested LOD system is used to improve performance, especially during the initial stage of a visualization of large datasets. T-junctions caused by discontinuities among adjacent tiles are also effectively eliminated with the developed mesh refinement algorithm. Combined with texture LODs, the developed system can produce seamless visualization of large terrain datasets with high rendering performance. It provides near real-time terrain visualization capability for large-area demonstration and applications
关键词：Level of Detail; Mesh Refinement; Digital Terrain Model; Visualization; 3D GIS
