ADAPTIVE LEVEL OF DETAIL FOR LARGE TERRAIN VISUALIZATION
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.
Level of Detail Mesh Refinement Digital Terrain Model Visualization 3D GIS
Fuan Tsai Huan-Chih Chiu
Center for Space and Remote Sensing Research National Central University 300 Zhong-Da Rd., Zhongli, Department of Civil Engineering National Central University 300 Zhong-Da Rd., Zhongli, 320 Taoyuan T
国际会议
北京
英文
3870-3875
2008-07-03（万方平台首次上网日期，不代表论文的发表时间）