The Research of Large Scale Terrain Visualization
大区域地形可视化技术的研究

Real-time rendering of landscape has attracted growing interesting in recent years. The existent accelerating methods of 3D terrain rendering have made their contributions to terrain visualization, but, they have themselves drawback, especially for large scale terrain visualization at interactive rate. Large scale terrain visualization contains the following contents: terrain multi-resolution representation, terrain and texture paging, terrain and texture LOD control and efficient data store and retrieve. Based on the research about management and real-time rendering of large scale terrain data, one method of generating multi-resolution terrain model is improved, which combines the representation of terrain multi-resolution model with view-dependent control. A new method of storing and retrieving terrain data by quadtree is proposed. Furthermore, an all-in-one terrain visualization system which integrates adaptive triangulation, dynamic scene paging and data updating is realized. At last, some experiments have been presented to verify the work done in this paper.