作　　者： ; ; ;

机构地区： 中国矿业大学北京地球科学与测绘工程学院

出　　处： 《系统仿真学报》 2014年第9期1975-1979,共5页

摘　　要： 以球面退化四叉树格网(Degenerate Quadtree Grid,DQG)为基础,设计了一个全球地形实时可视化系统。利用球面退化四叉树对全球地形数据进行分层、分块组织,综合考虑视距及瓦片中心到视野中心的距离两个因素,利用综合因子确定要绘制的地形瓦片的层次,并分别采用两种不同的方法消除同层和不同层之间的裂缝;应用Visual C#语言及Microsoft DirectX三维图形接口对系统进行开发,利用全球GTOPO30地形数据及局部高精度SRTM地形数据进行实验,并与原有系统进行对比;利用本文系统进行水淹模拟。实验结果表明,系统在地形的多分辨率表达及渲染帧率方面都有较大优势,能够实现实时、动态的仿真。 A global terrain visualization system based on spherical Degenerate Quadtree Grid （DQG） was designed. The subdivision principle of spherical DQG was used to manage global terrain data hierarchically. Both the view-distance and the distance from the center of the terrain tile to the center of the scene were considered to decide the terrain level. Different methods were used to eliminate the cracks of different types. The system was implemented by using C# programing language and Microsoft DirectX graphic interface. Additionally, contrast experiments to the existing system were conducted by using global GTOPO30 terrain data and local high-resolution SRTM terrain data. A water flooding simulation system was designed based on the global terrain visualization system. Results show that the system is better in multi-resolution visualization and rendering frame rate and able to realize real-time and dynamic simulating.

关 键 词： 地形可视化 退化四叉树格网 层次细节 多分辨率 实时可视化 水淹模拟

领　　域： [天文地球] [天文地球]