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交通是GIS技术最重要的应用领域之一,本文首先对城市交通网络空间数据模型进行了分类,然后介绍了近年来城市交通网络空间数据模型研究在导航数据库、时态数据处理、多模式交通网络表达等方面的主要进展。 相似文献
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本文根据线状要素地理信息表达的需要,对线状符号进行了分类.在分析了线状符号的视觉变量之后,给出了其图案单元的数据结构。最后结合线状符号的分解、组合特性提出了线状符号的配置方法。 相似文献
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借助GIS强大的空间数据处理和3维可视化分析功能,以长江中游湖北地区为试验区,利用现有的遥感影像、数字高程模型(DEM)和地理要素的矢量数据,实现了地形的3维可视化和地表分析。解决超大数据量数字高程模型(DEM)快速显示的算法,研究了基于3维场景空间分析的理论,最后对系统的实现做了简要介绍。 相似文献
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借助GIS强大的空间数据处理和3维可视化分析功能,以长江中游湖北地区为试验区,利用现有的遥感影像、数字高程模型(DEM)和地理要素的矢量数据,实现了地形的3维可视化和地表分析。解决超大数据量数字高程模型(DEM)快速显示的算法,研究了基于3维场景空间分析的理论,最后对系统的实现做了简要介绍。 相似文献
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可视化表达是人们认识客观地理环境的有效方式,地理信息系统作为人们认识客观地理环境的强有力工具,可以辅助人们进行规划决策,在这一过程中,如何通过可视化的方式传递信息是关键.本文基于视觉心理感受论研究了GIS中的数据采集录入可视化、数据管理可视化、数据质量评估可视化、界面设计可视化、电子地图地图显示可视化、查询分析结果可视化. 相似文献
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我国处于社会转型期,对突发事件引起的网络舆情分析需求迫切。微博由于其大数据特点为公众舆论和自然环境知识发现提供大量数据,将其与位置信息联系能给地理分析提供新的发现。通过用户发布的微博消息进行分析挖掘,为公众舆论监督提供帮助,为政府决策提供信息。本文在微博数据帮助下进行了数据挖掘,在空间维度上分析了舆论传播模式,使用可视化与统计方法相结合的方式探究了舆情传播规律。 相似文献
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在城市立交桥施工中,质量控制贯穿整个过程。文中以桂林市上海路立交桥为例,从测量工作出发,介绍城市立交桥施工测量质量控制的主要方案,力求为测量工作提供参考依据。 相似文献
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对应用于大型活动的交通组织管理与模拟的信息系统空间数据库数据模型、道路空间网络管理技术、路径存储数据结构与编辑技术进行了分析研究,提出了基于GIS技术的大型活动交通组织模拟系统的数据模型、空间网络管理技术、路径存储数据结构与编辑的主要技术。在此基础上,通过VC++基于MO开发了应用系统。所开发系统成功应用于中华人民共和国第十届运动会的交通组织与管理,提高了交通管理的工作效率。 相似文献
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JINBaoxuan BIANFuling ZUOXiaoqing WANGFangxiong 《地球空间信息科学学报》2005,8(2):115-121
With the rapid development of computer graphics, distributed-computing and Internet, it is possible to achieve Internet-based virtual city. This paper dwells on the method of the terrain and its feature modeling and complex entity modeling in the virtual city. Then, discusses the method for Internet-based virtual city 3D visualization and the design of the Browser/Server architecture of the system of virtual city in the network environment. Finally, Java and Java 3D are used to show an experiment example, and the related conclusion about Internet-based virtual city 3D displaying and the client-side interactive operation is given. 相似文献
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With the rapid development of computer graphics, distributed-computing and Internet, it is possible to achieve Internet-based virtual city. This paper dwells on the method of the terrain and its feature modeling and complex entity modeling in the virtual city. Then, discusses the method for Internet-based virtual city 3D visualization and the design of the Browser/Server architecture of the system of virtual city in the network environment. Finally, Java and Java 3D are used to show an experiment example, and the related conclusion about Internet-based virtual city 3D displaying and the client-side interactive operation is given. 相似文献
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An optimum vehicular path algorithm for traffic network based on hierarchical spatial reasoning 总被引:5,自引:0,他引:5
Human beings' intellection is the characteristic of a distinct hierarchy and can be taken to construct a heuristic in the shortest path algorithms.It is detailed in this paper how to utilize the hierarchical reasoning on the basis of greedy and directional strategy to establish a spatial heuristic,so as to improve running efficiency and suitability of shortest path algorithm for traffic network.The authors divide urban traffic network into three hierarchies and set forward a new node hierarchy division rule to avoid the unreliable solution of shortest path.It is argued that the shortest path,no matter distance shortest or time shortest,is usually not the favorite of drivers in practice.Some factors difficult to expect or quantify influence the drivers' choice greatly.It makes the drivers prefer choosing a less shortest,but more reliable or flexible path to travel on.The presented optimum path algorithm,in addition to the improvement of the running efficiency of shortest path algorithms up to several times,reduces the emergence of those factors,conforms to the intellection characteristic of human beings,and is more easily accepted by drivers.Moreover,it does not require the completeness of networks in the lowest hierarchy and the applicability and fault tolerance of the algorithm have improved.The experiment result shows the advantages of the presented algorithm.The authors argued that the algorithm has great potential application for navigation systems of large-scale traffic networks. 相似文献
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Human beings’ intellection is the characteristic of a distinct hierarchy and can be taken to construct a heuristic in the shortest path algorithms. It is detailed in this paper how to utilize the hierarchical reasoning on the basis of greedy and directional strategy to establish a spatial heuristic, so as to improve running efficiency and suitability of shortest path algorithm for traffic network. The authors divide urban traffic network into three hierarchies and set forward a new node hierarchy division rule to avoid the unreliable solution of shortest path. It is argued that the shortest path, no matter distance shortest or time shortest, is usually not the favorite of drivers in practice. Some factors difficult to expect or quantify influence the drivers’ choice greatly. It makes the drivers prefer choosing a less shortest, but more reliable or flexible path to travel on. The presented optimum path algorithm, in addition to the improvement of the running efficiency of shortest path algorithms up to several times, reduces the emergence of those factors, conforms to the intellection characteristic of human beings, and is more easily accepted by drivers. Moreover, it does not require the completeness of networks in the lowest hierachy and the applicability and fault tolerance of the algorithm have improved. The experiment result shows the advantages of the presented algorithm. The authors argued that the algorithm has great potential application for navigation systems of large-scale traffic networks. 相似文献