共查询到20条相似文献，搜索用时 796 毫秒
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在分析倾斜摄影实景三维模型建模与人工三维仿真模型两类模型优缺点的基础上,提出一种混合展示方法,实现了在同一三维场景中两类模型的独立加载和混合加载,并提出开展两类模型优势互补的三维应用方法。实验验证了其有效性、可行性。 相似文献
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在三维激光扫描真三维成果的基础上,介绍了一种优化贴图纹理的制作与处理方法,提升真三维模型的展示效果,开拓了三维激光扫描成果的应用领域。 相似文献
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以西安钟楼的精细测绘与三维建模为工程实例,利用三维激光扫描技术对钟楼进行精细扫描测量,构建了准确翔实的钟楼三维模型,绘制了楼体详尽的纵横剖面、立面等二维图,为钟楼修缮和存档提供了准确的测量数据、图形、图像及模型.此外,通过该案例,详细分析了三维激光扫描技术在中国古建筑测绘应用中的技术优势与不足. 相似文献
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针对城市三维GIS中的海量数据组织需求,本文设计并实现了基于关系数据库的三维模型数据库,主要特点是支持地形数据、三维模型几何与纹理数据的一体化存储和属性的自定义动态管理。结合城市三维GIS中的海量数据访问和管理需求,从空间索引、纹理缓存、属性存取、数据加密、数据更新等方面介绍了该架构,指出按模型类别建立分类索引,能够提高空间索引查询效率。 相似文献
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建立三维模型数据库是高效管理海量三维模型数据并实现网络化应用的基础。本文阐述了建立重庆都市区三维模型库的体制机制及技术路线,同时针对重庆山地城市地形复杂、建筑密度高、三维模型数据量大的特点,对三维模型细节程度划分及覆盖策略、模型数据分层及组织管理,以及三维引擎开发模式等关键技术问题提出了解决思路。 相似文献
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三维激光扫描是一种速度快、效率高、实时性强并且精度高的采集目标表面点云数据的技术,在测绘领域得到了广泛的应用。本文结合工程实例,论述了三维激光扫描技术在石化企业管线测量中的应用,并提出了依据点云数据对管道进行三维模型重建的方法,包括外业踏勘测站布设、数据采集与多站数据配准等工作,最后结合相关软件实现了管道三维模型的重建。 相似文献
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3维地图符号的数据结构研究 总被引：1，自引：0，他引：1
如何用计算机的1维存储空间存放由0维、1维、2维、3维等空间目标的集合所定义的形体，是几何造型中最基本的问题。文中针对传统地图符号表现方法的局限性，分析了国内外3维地图符号的研究现状，针对3维地图符号设计的特点和要求采用参数函数和边界数据模型作为建立3维地图符号的数据结构。 相似文献
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三维数据采集技术及其在房产、建筑、水利、电力、交通等行业的不断发展和深入应用,对三维地理信息系统提出了新的挑战,三维空间信息在GIS平台中不再只停留在"看一看"的阶段,而需要从数据接入、处理、渲染到分析结果的输出,形成完整的闭环,为相关行业应用提供坚实的技术基础,为管理和决策提供可靠依据.本文以SuperMap GIS平台中三维地理设计(3D Designer)为基础,介绍多源异构的三维空间数据在地理信息平台中处理和应用的关键技术.首先,介绍了多源异构三维空间数据的主要来源和主要特征;然后重点阐述空间数据在三维地理信息平台中处理的和应用的难点及关键技术,包括采用快速建模方法解决传统二维数据资源在三维地理信息平台中的应用问题,采用实例化技术提升BIM数据的渲染性能问题,采用空间数据处理和分析关键算法解决模型和大场景的精确匹配问题等;最后,介绍了SuperMap 3 D Designer的主要应用方式. 相似文献
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《制图学和地理信息科学》2013,40(3):140-153
A hybrid system that integrates two-dimensional (2D) GIS and three-dimensional (3D) visualization has been developed to provide unique solutions to application domains where traditional 2D GIS and 3D visualization cannot alone provide a solution. In this paper, we focus on three key issues in realizing such an integrated system, including large-scale terrain rendering, 2D and 3D combination display (for example, rendering 2D GIS layers in 3D space), expanding traditional 2D GIS analysis functions into a 3D environment, and visualizing 3D geographical data. A generic framework is developed to integrate 3D visualization with various types of 2D GIS, such as commercial GIS software, open source GIS software and spatial databases. A prototype 2D and 3D hybrid system that seamlessly integrates 2D GIS (developed with ArcEngine) and 3D rendering engine (developed with DirectX) is then developed based on the framework. In this hybrid system, 2D and 3D data are viewed within the same scene. Multiple 2D GIS layers are overlaid on the base terrain using a Level of Detail (LOD) model. Advanced query functions, data accessing, data management and spatial analysis, which are executed in the traditional 2D GIS, are provided to users in a 3D environment by continuously transforming information between the 2D GIS subsystem and the 3D subsystem. The 3D data are organized and displayed by Keyhole Markup Language (KML) and textured 3D models in the COLLAborative Design Activity (COLLADA) format. The prototype demonstrates that this hybrid system has effectively addressed the three key issues identified above and that it can seamlessly integrate 2D GIS and 3D visualization. The hybrid system has great potential to be employed in many application domains, such as urban planning, landscape design and environmental decision making, among others, to enhance the 3D design capability and facilitate public participation in the planning, design and decision-making process. 相似文献
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In order to understand the 3D landscape with many high buildings in a city, the 2D GIS has to be extended to 3D GIS. The further
development of CyberCity has to include various applications of 3D scenes from the outdoor scenes to the indoor ones. In thispaper,
some key techniques, such as data management method and dynamicalvisualization method for the outdoor and the indoor scenes,
are discussed. The indoor scene is compared with the outdoor one. The idea of integratedrepresentation of the outdoor and
the indoor scenes in CyberCity GIS is discussed.
Funded by the open research fund program of LIESMARS (No. 010302). 相似文献
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From 2D to 3D GIS for CyberCity 总被引：3，自引：2，他引：1
LIDeren ZHUQing LIUQiang XUPeng 《地球空间信息科学学报》2004,7(1):1-5
In order to understand the 3D landscape with many high buildings in a city, the 2D GIS has to be extended to 3D GIS. The further development of CyberCity has to include various applications of 3D scenes from the outdoor scenes to the indoor ones. In thispaper, some key techniques, such as data management method and dynamicalvisualization method for the outdoor and the indoor scenes, are discussed. The indoor scene is compared with the outdoor one. The idea of integratedrepresentation of the outdoor and the indoor scenes in CyberCity GIS is discussed. 相似文献
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三维GIS应用于楼宇租赁管理,不仅空间信息的展示更为直观,而且多维度空间分析功能更加强大。本文利用侧轴投影以及后期纹理、贴图、修正等处理将三维数据转换成2.5维数据,解决了数据量大和加载速度慢的问题;通过构建三维矢量图并与2.5维地图匹配融合,可以方便地查询属性信息;室内地图的制作包括概念建模、数据转换、地图切片三个步骤。文章将楼宇外部轮廓的三维模型和室内二维地图相结合,注重精细化管理和多维度、多层次的管理需要,使用户对楼宇信息管理系统的使用更加方便。 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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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