基于空间数据库VRGIS的研究与应用

结合空间数据库、GIS、计算机图形学、RS等技术构建了虚拟现实地理信息系统。通过研究地形数据的生成及空间数据库的存储管理,实现了遥感影像的自动配准及无缝拼接;基于四叉树的LOD算法、地形节点评价系统、动态调度及大规模纹理映射等技术的研究,实现了地形数据的3维可视化;提出了自适应特征数据覆盖渲染算法,将2维GIS特征数据覆盖叠加到所创建的3维模型上,构建了虚拟现实环境。该系统成功应用于胜利油田,实现了地下油田的虚拟现实3维可视化,具有一定的理论价值和现实意义。

The Research and Application for VRGIS Based on the Spatial Database

Combined with the spatial database,GIS,computer graphics,RS technology etc.,the paper constructs VRGIS which has realized the functions of automatic registration and seamless for the remote sensing image through the study of the terrain data generation and spatial database storage management.Additionally it has achieved 3D visualization of the terrain data based on the technology research of quadtree LOD algorithm,terrain node evaluation system,dynamic scheduling and large-scale texture mapping etc.That covers the 2D GIS feature data and adds it to the 3D model and builds the virtual reality environment by using the adaptive feature data cover rendering algorithm.The system has been successfully applied to the project of Shengli oilfield,and has realized the function of virtual reality 3D visualization for the underground oilfield.That has certain theory value and practical significance.