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虚拟现实技术在城市规划与设计领域的实践 总被引:11,自引:1,他引:11
虚拟现实技术是一种可以创建和体验虚拟世界的计算机技术 ,利用此项技术 ,可以为城市规划与设计提供较好的感性认识。本文介绍了虚拟现实技术和它在城市规划设计中的作用 ,并结合深圳市规划与国土资源信息中心在这方面的研究与应用工作 ,总结了一些应用经验 相似文献
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电子地图显示中点状要素LoD模型的建立 总被引:7,自引:0,他引:7
将计算机3维模型简化中的LoD技术引入电子地图显示中,通过构建Delaunay三角网和Voronoi图,提出了一种建立点状要素显示LoD模型的算法,基本上解决了电子地图显示时出现的重叠,压盖等现象。 相似文献
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3D (three-dimensional) process simulation is currently one of the most challenging fields of research on debris flow.Large scale terrain rendering is the most basic task of 3D scenery construction in debris flow simulation.As the major trigger for debris flow,rainfall will substantially enhance the realistic sense.Terrain and rainfall rendering in 3D debris flow simulations poses great challenges for numerical computation and graphical processing capability.In this paper,we propose to integrate GPU technology,LoD algorithms,and particle systems to realize 3D scenery modeling and rendering.The real-time LoD-based terrain modeling and rendering algorithm is presented first,and then a particle system-based rainfall scenery rendering method is implemented.Experimental results demonstrate that the 3D scenery rendered with the proposed approach exhibits sound performance and fair visual effects,which lays a solid foundation for the whole process simulation of debris flow disasters. 相似文献
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The decadal variation in the length of day and in the Earth's magnetic field is analyzed by empirical mode decomposition (EMD). The existence of a periodicity of about 60-years in the Earth's angular velocity has often been inferred and is confirmed here, with a new estimate of approximately 62 years. The existence of a similar periodicity in the geomagnetic field has been controversial. From the time series analyses presented here of the magnetic declination at 10 observatories, it is concluded that a geomagnetic periodicity of about 62?±?3 years does exist. A similar analysis of the magnetic inclination at five observatories gives a period of 58?±?5 years. The declination data from four observatories is found to correlate with the length of day signal, with a correlation coefficient of approximately 0.6. 相似文献
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地形信息的LoD建模及精度分析 总被引:5,自引:0,他引:5
对细节层次模型(LoD模型)不同层次之间的精度进行研究.提出用于分层的简化比率概念,建立表示LoD不同层次精度的分辨率误差模型,选取5种典型地貌区域进行实验,得到不同地貌区域的误差拟合公式.根据这些公式,可内插得到各种分辨率比率的误差.同时,利用逆公式,又能由误差确定相应的分辨率比率.最后,对不同地貌类型不同化简算法的模型化简误差进行分析研究.研究成果为评价LoD模型精度提供新的方法,也为简化DEM模型时选择适宜的分辨率提供科学依据. 相似文献
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"影像广东"三维地理信息服务平台的开发建设 总被引:1,自引:0,他引:1
"影像广东"平台采用四叉树索引、渐进网格多分辨率地形模型、小波变换数据压缩算法、Direct3D三维可视化等技术实现三维地理信息和影像的网络发布应用,对平台技术路线进行论述,展示初步建设成果,供同行参考研究. 相似文献
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虚拟地形场景绘制中的实时LoD算法 总被引:11,自引:2,他引:11
本文论述了基于视点的连续LoD算法在动态虚拟地形场景绘制中的应用,我们通过分析规则格网数字高程模型的规律性,推导了3个与视点相关的判据来动态简化地形:(1)图像空间误差,(2)视锥台相一,(3)节点方向性,实验结果证明,该算法在基本保持视觉效果不变的情况下,极大地提高了虚拟地形场景的绘制速度。 相似文献
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