Study On Organization And Visualization Of The Big Scene 3d Landscape Of Dataset

Three-dimensional scene visualization of large-scale is an important research issue in three-dimensional geographic information system。Especially,when the "Digital Earth" be proposed, people put forward three-dimensional terrain visualization higher requirements. It is hoped that to observe a more realistic, a wider range of terrain in a more natural way. However, with the development of remote sensing technology and satellite technology, made the three-dimensional terrain geometry and texture data increase a large amount of datas.Therefore, It is the key to design an effective data organization and storage methods and rational and efficient dynamic scheduling algorithm for a realistic scenario and display and interaction of large-scale real-time three-dimensionalThe main coverage of the paper are as follows:1)The construction of large-scale three-dimensional scene. This paper describes the main technical of the current large-scale data processing and display of scenes involved, Describing the LOD algorithm and crack repair methods in detail.2)The organization of multi-resolution terrain.Build e pyramid data models by blocking DEM and texture data, providing multi-resolution terrain data directly without having to show real-time reduction. Improve the data access time and reduce the burden of memory;3)The scheduling of terrain data. Throw learn the existed Dynamic Scheduling Thoughts of terrain data, Design and implement a viable, depending on the combination of the relevant LOD terrain dynamic scheduling algorithm. And the introduction of multi-threading technology, making the rending threads and the caching threads parallel For no data partitioning and scheduling of scene drawing systems, improved the rendering frame rate, achieved a large-scale terrain walkthrough system showing smoothly and continuously...