本文基于Cesium技术和osg Earth技术研发了面向三维场景数据的客户端与服务端混合渲染方法。该方法包括分层细节级别(hierarchical level of detail,HLOD)层级瓦片筛选规则、三级缓存策略、多用户并发与分布式渲染任务分配等关键技术,...本文基于Cesium技术和osg Earth技术研发了面向三维场景数据的客户端与服务端混合渲染方法。该方法包括分层细节级别(hierarchical level of detail,HLOD)层级瓦片筛选规则、三级缓存策略、多用户并发与分布式渲染任务分配等关键技术,既能减少客户端的数据压力和资源压力,又能通过服务端的渲染集群提高三维场景的显示效率。本文在混合渲染方法基础上,设计和实现了远程地理信息系统(Tele-geographic information system,TeleGIS)三维大数据万维网(Web)显示系统。实验证明,该系统能够完成海量、高密度、高精度三维场景数据的在线可视化任务,可视化性能和数据量可扩展性达到设计目标,在当前同类技术中具有较大优势。展开更多
Based on the analysis of impedance tensor data, tipper data, and the conjugate gradient algorithm, we develop a three-dimensional （3D） conjugate gradient algorithm for inverting magnetotelluric full information data...Based on the analysis of impedance tensor data, tipper data, and the conjugate gradient algorithm, we develop a three-dimensional （3D） conjugate gradient algorithm for inverting magnetotelluric full information data determined from five electric and magnetic field components and discuss the method to use the full information data for quantitative interpretation of 3D inversion results. Results from the 3D inversion of synthetic data indicate that the results from inverting full information data which combine the impedance tensor and tipper data are better than results from inverting only the impedance tensor data （or tipper data） in improving resolution and reliability. The synthetic examples also demonstrate the validity and stability of this 3D inversion algorithm.展开更多
There is usually source effect in the field work of controlled-source audio-frequency magnetotelluric method.Source effect is a thorny problem during field working,data processing and interpretation.Therefore,it is ve...There is usually source effect in the field work of controlled-source audio-frequency magnetotelluric method.Source effect is a thorny problem during field working,data processing and interpretation.Therefore,it is very important for the results of field prospecting to model source effect and summarize its influence rules.Based on the previous research,the authors use 3D finite difference method to simulate the electromagnetic field and set different anomaly situation to study the source effect in near-field measurement,then conclude the influence rules of source effect.Simulations provide the reference for the actual field work and data processing to correct the influence of source effect,so the information of the underground will be more approaching to the real.展开更多
文摘本文基于Cesium技术和osg Earth技术研发了面向三维场景数据的客户端与服务端混合渲染方法。该方法包括分层细节级别(hierarchical level of detail,HLOD)层级瓦片筛选规则、三级缓存策略、多用户并发与分布式渲染任务分配等关键技术,既能减少客户端的数据压力和资源压力,又能通过服务端的渲染集群提高三维场景的显示效率。本文在混合渲染方法基础上,设计和实现了远程地理信息系统(Tele-geographic information system,TeleGIS)三维大数据万维网(Web)显示系统。实验证明,该系统能够完成海量、高密度、高精度三维场景数据的在线可视化任务,可视化性能和数据量可扩展性达到设计目标,在当前同类技术中具有较大优势。
基金supported by the National Hi-tech Research and Development Program of China（863Program）（No.2007AA09Z310） National Natural Science Foundation of China（Grant No.40774029 40374024）+1 种基金 the Fundamental Research Funds for the Central Universities（Grant No.2010ZY53） the Program for New Century Excellent Talents in University（NCET）
文摘Based on the analysis of impedance tensor data, tipper data, and the conjugate gradient algorithm, we develop a three-dimensional （3D） conjugate gradient algorithm for inverting magnetotelluric full information data determined from five electric and magnetic field components and discuss the method to use the full information data for quantitative interpretation of 3D inversion results. Results from the 3D inversion of synthetic data indicate that the results from inverting full information data which combine the impedance tensor and tipper data are better than results from inverting only the impedance tensor data （or tipper data） in improving resolution and reliability. The synthetic examples also demonstrate the validity and stability of this 3D inversion algorithm.
基金Supported by project of China Geological Survey(No.12120113098400)
文摘There is usually source effect in the field work of controlled-source audio-frequency magnetotelluric method.Source effect is a thorny problem during field working,data processing and interpretation.Therefore,it is very important for the results of field prospecting to model source effect and summarize its influence rules.Based on the previous research,the authors use 3D finite difference method to simulate the electromagnetic field and set different anomaly situation to study the source effect in near-field measurement,then conclude the influence rules of source effect.Simulations provide the reference for the actual field work and data processing to correct the influence of source effect,so the information of the underground will be more approaching to the real.
