三维航道GIS中大型场景的动态组织与可视化技术研究

三维可视化技术以其直观、逼真、实时、动态等特征,目前己成为港口、海岸、航道、运河等相关领域进行科学研究、工程设计、管理与决策的重要手段。文中在对基于该技术实现的天津港三维港区与航道信息管理系统进行简单介绍的基础上,重点研究了基于空间网格索引技术、Delaunay三角网技术与LOD技术的港口地面景观与地形模型的动态组织与管理,以及基于多线程技术和OpenGL的显示列表技术的子场景块与专题信息的实时读取与渲染,并对动态海洋、全景天空、水下地形仿真与漫游、交互操作与信息查询等作了深入探讨。实践表明,文中所开发的三维可视化系统中大数据量、复杂的场景对绘制的速度影响并不大,场景逼真度高,能进行实时操作与漫游,可以满足航道与港口三维可视化、空间分析与管理的需要。

Study on great scene dynamic organization and visualization technology in 3D waterway GIS

At the present time,3D visualizing technology,with its character of clear, realistic,real-time and dynamic,has become the important means to scientific research,project design,management and decision-making in the fields of harbor,seacoast,sea-route and canal.On the basis of brief introduction of Tianjin 3D Harbor and Waterway Information Management System with this technology,the paper endeavors to research the dynamic organization and management of harbor scene and terrain model based on the technology of spatial grid indexing,Delaunay triangulation and LOD technology,and to research real-time access to sub-scene relative information based on the technology of multithreading and OpenGL view-list technology.A deep discussion on the simulating and roaming,interactive operating and information accessing of dynamic sea, panoramic sky and underwater terrain are also made in this paper.All in all, practice indicates that 3D visualizing technology discussed in this paper with its huge data and life living scene but not much influence to the painting pace,could meet the needs of 3D visualizing,spatial analyzing and management on sea-route and harbor.