真地表数据视点相关可视化技术
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摘要
针对KLSeis三维观测系统设计中大规模地表数据实时可视化问题,提出了基于视点的细节层次控制技术和内外存调度的数据控制策略。利用索引技术对海量地表数据进行多分辨率数据重组,采用四叉树快速搜索算法并结合动态页面调度和实时LOD技术实现大规模地表数据高速加载和无延迟显示,突破了原有格网模型数据量限制,实现了流畅逼真的真地表模拟,为复杂探区地震采集设计提供了一种先进的技术手段。
Large volume data storage and real-time rendering of terrain information is playing a key role in seismic acquisition engineering software system (KLSeis).For the purpose of real-time rendering huge terrain dataset,an approach of view-dependent level-of-detail (LOD) and multi-resolution data organization is put forward for the real-time visualization in KLSeis 3-D survey geometry design system.Dynamic data management is achieved by target-tile searching algorithm based on human’s visual perception.The out-of-core technique was adopted to extend the main memories to the sizes of external hard drivers to alleviate the storage problem for managing huge datasets.The view-dependent visualization method provides theoretical foundation and technical supports for 3-D seismic data acquisition in complex surface area.
Large volume data storage and real-time rendering of terrain information is playing a key role in seismic acquisition engineering software system (KLSeis).For the purpose of real-time rendering huge terrain dataset,an approach of view-dependent level-of-detail (LOD) and multi-resolution data organization is put forward for the real-time visualization in KLSeis 3-D survey geometry design system.Dynamic data management is achieved by target-tile searching algorithm based on human’s visual perception.The out-of-core technique was adopted to extend the main memories to the sizes of external hard drivers to alleviate the storage problem for managing huge datasets.The view-dependent visualization method provides theoretical foundation and technical supports for 3-D seismic data acquisition in complex surface area.
引文
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2 Duchaineau M,Wolinsky M,Sigeti D E,et al.ROA-Ming terrain:Real-ti me opti mally adapting meshes[A].In:IEEE Computer Society and ACM.IEEEVisualization′97,Proceedings[C].Phoenix:IEEEComputer Society and ACM,1997.81~88
3 Lindstrom P,Pascucci V.Terrain si mplification si m-plified:A general framework for view-dependent out-of-core visualization[J].IEEE Transaction on Visual-ization and Computer Graphics,2002,8(4):239~254
4 Losasso F,Hugues H.Geometry clipmaps:Terrainrendering using nested regular grids[J].ACM Trans-actions on Graphics,2004,23(3):769~776
5陆艳青.海量地形数据实时绘制的技术研究:〔博士学位论文〕[D].杭州:浙江大学,2003
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