大规模水下地形实时三维可视化技术研究  

Real-time 3D visualization technology of large scale underwater topography

作　　者：冯传勇 张振军 FENG Chuanyong;ZHANG Zhenjun(Hydrology Bureau,Changjiang Water Resources Commission,Wuhan 430010,China)

机构地区：[1]长江水利委员会水文局,湖北武汉430010

出　　处：《人民长江》2021年第11期117-121,共5页Yangtze River

基　　金：国家重点研发计划项目(2017YFC1502604);中国长江三峡集团有限公司科研项目(0704168)。

摘　　要：针对大规模水下地形海量数据与有限的计算机内存空间及显卡绘图效率之间的矛盾,提出了一种基于DEM瓦片金字塔模型与Oracle数据库的海量地形数据组织与储存方法,以及一种基于透视投影的四叉树调度方法,实现LOD地形实时高效渲染。针对水下地形起伏小、立体效应差的问题,提出一种基于高程分布概率密度的自适应分层设色法,增强了水下地形渲染的立体感。典型应用结果表明:该方法可突破计算机硬件性能限制,在普通PC机环境实现大规模水下地形的实时、交互式三维可视化,并取得较高的效率和良好的视觉效果。In view of the contradiction between massive data of large-scale underwater terrain and limited computer memory space and graphics card drawing efficiency,we propose a method of massive terrain data organization and storage based on DEM tile pyramid model and Oracle database,and a quadtree scheduling method based on perspective projection to achieve real-time and efficient rendering of level of detail(LOD)terrain.Moreover,considering the small undulation and poor stereo effect of underwater terrain,an adaptive hierarchical coloring method based on elevation distribution probability density is proposed to enhance the stereo effect.Typical application results show that the proposed method can realize real-time and interactive 3D visualization of large-scale underwater topography on ordinary PC,and achieve high efficiency and fine visual effect.

关 键 词：水下地形 三维可视化 层次细节模型 数字高程模型 自适应分层设色 

分 类 号：TV221.1[水利工程—水工结构工程]