共查询到20条相似文献，搜索用时 328 毫秒
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尝试采用新一代图形引擎CryEngine实现小尺度条件下多要素耦合与逼真表达,探索基于该引擎的虚拟地理环境构建方法,包括虚拟地形环境的快速构建方法、车辆建模与动态模拟方法、人物建模与智能行为模拟方法,以及场景集成与渲染方法等。以虚拟校园为原型系统,验证所提方法的可行性以及可视化效果,结果表明,基于CryEngine构建虚拟地理环境路线可行,尤其在面向小尺度虚拟环境时,能够很好地将环境、实体和人物紧密耦合在一起,且其逼真程度较现有虚拟环境有大幅度提升。 相似文献
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针对港口建设研究了三维场景数据组织和建设过程的动态模拟。首先,介绍了复杂三维场景数据分类分区标准和数据建模流程;然后,详细阐述了基于场景分块、多级模型动态调度和"实体-类"模式的复杂三维场景组织和集成方法;最后,提出要素生存周期的概念,将模型与建设时间进度匹配。在此基础上,设计并开发了天津中心渔港三维动态演示系统,实现港口建设过程的三维动态模拟。 相似文献
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针对城市设计存在的异构数据难以充分共享的问题,该文采用本体的方法和技术,按照空间布局、建筑形态、景观组织的数据组织方式构建城市设计本体模型,提出基于本体的城市设计数据集成应用方法:基于OWL实现城市设计数据语义信息共享,通过本体中间件技术实现异构设计数据和本体数据的映射,从而将多源本体数据片段集成为统一的城市设计语义视图。基于该方法开发的原型系统表明,该方法能够实现城市设计异构数据的一致理解和充分共享,促进设计成果在三维虚拟地理环境下的集成应用。 相似文献
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网络二维地图与三维虚拟场景集成探讨 总被引：2，自引：2，他引：0
文章以网络二维地图和三维虚拟场景集成为主要线索,从常用空间数据三维模型建模方法出发,探讨了集成的总体思路。并从系统的角度讨论了网络环境下二三维集成的体系结构及集成后各模块之间的通信方法。在实例研究部分,设计并实现了一个二三维集成的原型系统。最后对网络二维地图与三维虚拟场景集成进行了展望。 相似文献
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本系统通过多种方法采集并分析数据,采用3DS Max进行建筑三维建模,结合并利用Skyline组件进行系统开发,实现对某房地产小区的三维虚拟场景开发。该系统不但提供三维游览服务,同时也实现了地理信息系统的多种三维分析功能。 相似文献
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从实景三维建模到数字孪生建模是国家数字经济和智慧社会建设与发展的基本需求。本文探讨了实景三维建模和数字孪生建模的关键技术内涵,介绍了数字乡村、未来社区和智能铁路等典型应用场景。广域范围实景三维建模在低成本高效数据采集和智能化自动化三维精细建模与动态更新方面面临挑战,城市级或重大工程级的数字孪生建模在全要素整体性的表征数据与机理模型集成表达方面还存在关键技术瓶颈。测绘技术亟须多学科交叉融合创新,突破天空地有机协同实时动态获取多细节层级实景三维数据、智能化处理多专业多尺度多模态时空数据、不完备数据条件下复杂场景的三维实体化精细建模、表征数据与机理模型结合的全生命周期数字孪生模型动态构建等核心关键技术,形成通用地理空间智能,实现测绘技术的高质量发展和对经济社会发展不可替代的更有力的基础支撑。 相似文献
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地理分析模型是对现实世界中地理过程的抽象与表达,是虚拟地理环境能够反映真实世界的重要工具。随着地理学的发展,跨领域、多学科合作式地理建模逐渐成为地理学的研究趋势,地理分析模型共享与重用也已经成为研究热点之一。然而,地理分析模型运行平台的差异性导致了其在共享与重用上存在困难,表现在用户难以直接透明共享不同平台下的模型。目前,地理分析模型运行平台主要包含Windows与Linux,Linux平台上存在大量模型,但相关模型服务共享与重用研究相对较少。本文面向Linux平台不同操作系统,分析其差异性及安全性,设计模型服务化的安全策略;面向Linux平台下地理分析模型的异构特征,设计了模型基本信息描述接口、行为接口及部署接口,实现Linux系统下地理分析模型的服务共享与重用。本文以system for automated geoscientific analyses（SAGA GIS）中的网格分析模型为例,对所设计的Linux平台下地理分析模型服务化封装方法进行了验证,显示了所设计封装策略的可行性,为Linux平台下地理分析模型的共享与重用提供了理论与方法基础。 相似文献
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A VR (virtual reality) simulator which is used for helicopter simulations requires a virtual environment of real world urban areas. However, real urban environments are continuously changing. It is necessary to develop a modeling method that makes direct use of GIS (geographical information system) data which is updated periodically. A flight simulation needs to visualize not only buildings in the near distance but also a large number of buildings in the far distance. We propose a method for modeling urban environments from aerial images and digital maps with relatively little manual work. An image‐based method is applied to the urban modeling that considers the characteristics of Korean cities. Buildings in the distance can be presented without creating a large number of polygons. The proposed method consists of a pre‐processing stage that prepares the model from the GIS data and a modeling stage that creates the virtual urban environment. The virtual urban environment utilizes the height map of buildings. 相似文献
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在虚拟地理空间中开展复杂科学实验和管理分析,是目前及未来发展的一个重要趋势。本文对高速铁路场景中的线路、地物和地形对象的关系进行了详细分析,提出了基于空间关系描述的虚拟高速铁路场景建模方法。通过XML标记语言对线路、地物和地形的空间关系进行统一描述,引导和规范场景建模过程中的模型点位计算和地形处理过程。详细讨论了虚拟高速铁路的场景建模流程、场景对象空间关系定义、模型点位计算方法以及地形处理方法,并选择案例区域进行试验。试验结果表明该方法能够有效地理清虚拟场景中各种对象间的关系,从而可以快速建设符合现实标准的、具有高度仿真感觉的虚拟高速铁路场景。 相似文献
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探究城市生态环境与人类活动的关系,是目前城市化进程中的重要研究内容。结合多源数据,提出了采用兴趣点（point of interest,POI）、开放街道地图（OpenStreetMap,OSM）道路网、住宅区数据构建人类活动指标（住宅区可步行测度指数、街道活力指数、城市功能混合度指数）和利用遥感影像构建城市生态环境指标（遥感生态指数）的方法。并结合多项式回归（polynomial regression,PLR）、随机森林回归（random forest regression,RFR）、极限梯度提升回归（extreme gradient boosting regression,XGB）、支持向量回归机（support vector regression machine,SVR）等机器学习模型,对城市生态环境与人类活动指标进行回归分析。以中国江西省南昌市为例开展实例研究,结果显示:（1）人类活动的3项指标均呈现中心高,向四周逐渐递减的趋势,而城市生态环境指标则表现出相反的态势。（2）在探究城市生态环境与人类活动关系的研究中,XGB的效果最好。（3）街道活力指数、城市功能混合度指数与城市生态环境的相关性更强,住宅区可步行测度指数与城市生态环境的相关性更差。（4）在人类活动影响较小的区域,城市生态环境会受到其他因素的干扰导致预测结果精度不高,而在人类活动强烈的区域预测精度较高。 相似文献
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Dynamic flood disaster simulation is an emerging and promising technology significantly useful in urban planning, risk assessment, and integrated decision support systems. It is still an important issue to integrate the large assets such as dynamic observational data, numerical flood simulation models, geographic information technologies, and computing resources into a unified framework. For the intended end user, it is also a holistic solution to create computer interpretable representations and gain insightful understanding of the dynamic disaster processes, the complex impacts, and interactions of disaster factors. In particular, it is still difficult to access and join harmonized data, processing algorithms, and models that are provided by different environmental information infrastructures. In this paper, we demonstrate a virtual geographic environments-based integrated environmental simulation framework for flood disaster management based on the notion of interlinked resources, which is capable of automated accumulating and manipulating of sensor data, creating dynamic geo-analysis and three-dimensional visualizations of ongoing geo-process, and updating the contents of simulation models representing the real environment. The prototype system is evaluated by applying it as a proof of concept to integrate in situ weather observations, numerical weather and flood disaster simulation models, visualization, and analysis of the real time flood event. Case applications indicate that the developed framework can be adopted for use by decision-makers for short-term planning and control since the resulting simulation and visualization are completely based on the latest status of environment. 相似文献
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Capturing spatial population distribution can offer useful information for urban planning to promote reasonable population distribution and allocate urban resource. Agent-based model (ABM) based on the modeling idea of “bottom-up” can offer the ability to simulate the complex individual behaviors that generate spatial population distribution. Previous ABMs were unable to be extended for simulation of spatial population distribution at a fine scale due to the shortage of fine characterization of the urban environment and the calibration of agents' behavior. This study filled these gaps by proposing a genetic algorithm-ABM (GA–ABM) for fine-scale simulation of spatial population distribution in a manufacturing metropolis. In this model, the employment and residential choice behaviors of agents were defined by the labor economic theory and discrete selection model. Multisource geospatial big data such as enterprise points-of-interest big data and building footprints data were used to finely characterize the labor market and urban environment to reflect the impact of agents' employment choices on their residential decision. Furthermore, the grid-scale population investigation big data were combined with the GA to calibrate the agents' residential decision behaviors. The proposed model was used in Dongguan, the typical manufacturing metropolis in China. As a comparison, the expert-experience-based method-ABM (EEBM–ABM) was also conducted by using the same data set. Through the comparison of the results produced by these two models, it was demonstrated that the model coefficient calibrated by GA could effectively reflect the agents' residential decisions. The calibrated GA–ABM is more capable than EEBM–ABM in simulating spatial population distribution in a manufacturing metropolis. Hence, the proposed model can be used to simulate spatial population distribution in a manufacturing metropolis which helps the urban planner to conduct scientific urban planning. 相似文献
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针对目前地理信息科学领域存在的三维地理场景大都是局部的、基于投影的2.5维表面模型的问题,该文提出了利用球体大圆弧八叉树剖分(SGOG)瓦块建立大区域真三维地理场景的方法。将SGOG特定剖分层次的顶点与全球共享DEM数据进行匹配,构建大区域真三维地形框架;以地形起伏度为阈值,采用不同层次的瓦块进行自适应建模,大大减少了数据量;粘贴遥感纹理,建立虚拟地理场景。中国大陆地区的实验结果表明:所提方法不但顾及了地球曲率,克服了投影变形的缺陷,而且可以利用SGOG多尺度特性,灵活建立各种(混合)尺度的模型,并可实现地表上下空间的一体化建模。 相似文献