基于多核CPU的大规模DEM并行三维渲染  

Parallel Rendering of Large-scale DEM Based on Multi-core CPU

作　　者：陈景广[1] 佘江峰[1] 宋晓群[2] 王铁成[3] 

机构地区：[1]南京大学地理信息科学系,南京市汉口路22号210093 [2]江苏省国土资源信息中心,南京市四牌楼巷47号210029 [3]江苏省测绘工程院,南京市北京西路75号210031

出　　处：《武汉大学学报（信息科学版）》2013年第5期618-621,共4页Geomatics and Information Science of Wuhan University

基　　金：国土资源部公益性行业科研专项资助项目(201011015-1)

摘　　要：采用数据分块进行地形数据组织,基于缓存策略进行数据调度,对各地形块采用四叉树LoD(level of detail)的细节简化算法,利用多核CPU的计算特性实现四叉树LoD的并行生成,在动态构造地形三角网后,让不同的CPU核心负责不同地形区域以实现并行渲染,基于OpenMP及OpenThreads建立原型系统。实验结果表明,并行化渲染具有明显的性能优势。DEM data is organized in blocks and scheduled with cache. An algorithm based on LoD is implemented with multi-core CPU for simplifying the terrain triangulation network dynamically during rendering process. The terrain model is divided into pieces so that the rendering process for each piece can be implemented in parallel. An experimental system based on parallel rendering algorithm is developed, with OpenMP and OpenThreads. The results show that the rendering performance of the 3D DEM system is improved efficiently based on parallel algorithm as compared with traditional algorithm.

关 键 词：并行渲染 多核CPU 数据调度 LOD 缓存 

分 类 号：P208[天文地球—地图制图学与地理信息工程]