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《International Journal of Digital Earth》2013,6(6):505-520
In this paper, an overview of phases for modelling and mapping third dimension of spatial objects in a database is presented based on a selected spatial database management system (DBMS). These phases include (1) defining a spatial reference system for representing three-dimensional (3D) objects with real-world coordinates, (2) geometric modelling of 3D objects in the database, (3) 3D spatial indexing for fast accessing/querying the 3D data, 3D spatial queries and representation of 3D data. Then, a case study is performed to assess needs, possibilities and potential limitations of 3D data modelling in the spatial database. 相似文献
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GIS中三维空间数据模型的集成与应用 总被引:1,自引:0,他引:1
针对三维地理信息系统中的三维空间数据模型,结合城市规划工作,分析讨论了三维数据模型集成的必要性以及TIN与CSG、八叉树与TEN、矢量与栅格等混合数据模型实现的方法和思路,提出了在城市规划应用中模型集成的适用类型及有关要求. 相似文献
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For marine logistics and maintenance of extensive and expensive marine engineering projects in the coastal zone, it is essential that institutions provide the public with relevant information in an easily understandable yet comprehensive manner over the web. A perennial challenge, however, has been the development of spatio-temporal (four-dimensional (4D)) geo-visualization algorithms to enable the integration of time-varying geo-information in map-based visualizations on the Internet. In this paper, we address the challenge of visualizing marine spatial data in web-based applications through a 4D visualization concept, focusing on usability criteria, performance parameters, the required implementation effort, and delivering a breath of spatial information that supports decision-making on multiple levels. We used Web Graphic Library (WebGL) to validate our concept through a prototypical implementation. In our technology evaluation, WebGL proved highly suitable for the development of interactive, responsive, efficient, and mobile web-based Geographic Information applications, including 2D, 3D, and 4D (spatiotemporal) content. During our research, we identified a number of open research questions, including mapping graphic variables to thematic expressivity, representation of the time dimension in 4D systems, generic temporal generalization, and integration of (pseudo-)photorealistic illustrations in web-based geo-visualization systems. 相似文献
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三维GIS关键技术的研究 总被引:1,自引:2,他引:1
主要从三维GIS的特点、三维GIS的可视化、三维GIS的数据结构与数据模型、三维GIS的空间分析等几方面所涉及的技术进行了总结和研究,最后指出了存在的当务之急需要解决的问题。 相似文献
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当前的3维GIS重视3维空间方面的研究。重点是研究3维空间的几何对象的数据组织、操作方法以及查询分析等内容。本文通过对3维空间数据模型的研究,建立了一种基于CityGML语义的以建筑物为主的城市目标3维空间数据组织方法。这种方法丰富了城市3维空间数据建模,尤其对3维中的城市目标查询、统计和分析奠定了良好的基础。 相似文献
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城市是一种人地关系系统,数字城市是物质城市在数字网络空间的再现和反映。城市GIS是数字城市的核心,通过对3维GIS的介绍,主要探讨了3维GIS在城市3维景观建模中的作用和方法,并且对3维GIS在城市3维景观中的应用目标、功能、方法及其展望做了初步的探究。 相似文献
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地理信息系统是一门新兴技术,因其强大的空间数据处理与计算能力被广泛应用在国土、城市规划、测绘等诸多行业。测绘工作不仅仅需要解决数据采集与编辑工作,在近几年的工作实践中,需要对特殊地区进行3D显示。GIS软件不仅能够做到对测绘数据的整理与编辑,同时具有其强大的3D显示功能,并可与遥感影像数据进行完美融合,在不利用其他3D软件的情况下对测绘区域进行3D模拟演示。 相似文献
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基于3D GIS的城市空间规划分析方法研究 总被引:1,自引:0,他引:1
分析了福州三山视线控制线规划,采用了基础空间数据和ArcGIS 9.0平台,实现了快速建立数字高程模型与建筑物三维框架模型. 相似文献
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Engineering excavation GIS (E2 GIS) is a real-3D GIS serving for geosciences related to geo-engineering, civil engineering and mining engineering based on generalized tri-prism (GTP) model. As two instances of GTP model, G-GTP is used for the real-3D modeling of subsurface geological bodies, and E-GTP is used for the real-3D modeling of subsurface engineering excavations. In the light of the discussions on the features and functions of E2GIS, the modeling principles of G-GTP and E-GTP are introduced. The two models couple together seamlessly to form an integral model for subsurface spatial objects including both geological bodies and excavations. An object-oriented integral real-3D data model and integral spatial topological relations are discussed. 相似文献
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WULixin SHIWenzhong 《地球空间信息科学学报》2004,7(2):123-128
Engineering excavation GIS (E^2GIS) is a real-3D GIS serving for geosciences related to geo-engineering, civil engineering and mining engineering based on generalized tri-prism (GTP) model.As two instances of GTP model, G-GTP is used for the real-3D modeling of subsurface geological bodies, and E-GTP is used for the real-3D modeling of subsurface engineering excavations. In the light of the discussions on the features and functions of E2 GIS, the modeling principles of G-GTP and E-GTP are introduced. The two models couple together seamlessly to form an integral model for subsurface spatial objects including both geological bodies and excavations. An object-oriented integral real-3D data model and integral spatial topological relations are discussed. 相似文献
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探讨了3维城市数据管理的有关问题,基于3维GIS软件Supernatural GIS研究了3维城市模型大场景海量数据的分区管理、动态调度和快速显示问题,提出了应用Supernatural GIS实现城市3维可视化及大范围城市景观动态漫游的解决方案。 相似文献