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分析、比较了各类网络三维技术,提出了基于Java3D实现三维景观网络发布的技术方案,并探讨其实现的关键技术与解决方案以及系统架构。在Java 2平台上实现了对应的实验系统,验证了这种方案的可行性。 相似文献
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随着计算机图形学、分布式计算和Internet的迅速发展,实现Internet上的虚拟城市已经成为可能.首先对虚拟城市中地形模型、地物模型和复杂实体模型的建立方法进行详细的论述,然后讨论J2EE环境下3维城市模型的可视化方法,设计网络环境下虚拟城市系统的浏览器/服务器多层体系结构,最后采用Java和Java3D技术,在J2EE环境下给出虚拟城市的3维显示及客户端交互操作的实验例子和相关结论. 相似文献
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基于Java3D的网络地理信息可视化 总被引:7,自引:2,他引:7
在分析WebGIS中地理信息可视化研究现状的基础上,详细介绍了Java3D开发库的基本开发机制,并讨论其关键技术与解决方案,成功实现了基于Java3D的网络地理信息Web浏览器。实验表明,通过Java3D建立数字球面,并利用Java3D空间数据模型表达地理信息模型,实现在数字球面上映射地理信息,是实现网络地理信息可视化的新途径和新思路。 相似文献
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在分析WebGIS中地理信息可视化研究现状的基础上,详细介绍了Java3D开发库的基本开发机制,并讨论其关键技术与解决方案,成功实现了基于Java3D的网络地理信息Web浏览器.实验表明,通过Java3D建立数字球面,并利用Java3D空间数据模型表达地理信息模型,实现在数字球面上映射地理信息,是实现网络地理信息可视化的新途径和新思路. 相似文献
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利用高分辨率卫星遥感影像提取地物数据,使用虚拟现实技术对城市景观进行三维重建。使用纹理映射技术,构建具有高度真实感的城市三维景观,是城市基础空间数据库和城市GIS的重要组成部分。本文就利用高分辨率卫星影像实现城市三维可视化进行了探讨。 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
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Wumeng Huang 《International Journal of Digital Earth》2018,11(9):939-955
3D city models, which are important items of content on the virtual globe, are characterized by complicated structures and large amounts of data. These factors make the visualization of 3D city models highly dependent upon the performance of computer hardware. Thus, achieving the efficient rendering of 3D city models using different hardware performance levels represents one of the key problems currently facing researchers. This paper proposes a time-critical adaptive visualization method that first estimates the possible rendering time for each model according to the data structure of the model in addition to the CPU/GPU performance of the computer. It then dynamically adjusts the rendering level for each model based on the results of an estimation of the rendering time to ensure that the final scene can be completed within a given time. To verify the effectiveness and flexibility of this method, it is applied using different computers. The results show that the adaptive visualization method presented in this paper not only can adapt to computers with different levels of performances but also demonstrates an obvious improvement in the time estimation precision, visual effects, and optimization speed relative to existing adaptive visualization methods. 相似文献
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研究了ROAM算法和视锥体裁剪、三角形扇、几何变形等优化技术,实现了重力场三维可视化,模拟海洋环境,建立了重力场三维场景,适用于大范围、高分辨率重力场数据。 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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移动电子地图中伪3D可视化设计 总被引:1,自引:0,他引:1
定义了移动电子地图中伪3D可视化概念,提出伪3D可视化模型,并设计了快速的三维投影变换算法。进行了移动电子地图的伪3D可视化实验设计,并给出了可视化性能测试结果。 相似文献
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基于ArcEngine的三维地形可视化系统设计与实现 总被引:1,自引:1,他引:0
以Visual C#.NET为开发平台,以ArcEngine为开发组件,详述了三维地形可视化功能的实现方法和关键技术,设计并实现了包括地形表面生成、三维场景显示、地形因子分析及通视分析等功能的基于ArcEngine的三维地形可视化系统. 相似文献
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主要介绍了数字城市中地上、地下数据的管理以及3维可视化技术,对地上地下场景进行了综合比较,讨论了地上地下3维一体化的表现思想,精确的表现地形地貌、地上建筑、地下管线分布,让设计人员和决策者可以在宏观层面把握城市空间形态的要点和亮点,体现城市特色. 相似文献
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随着“数字地球”、“数字城市”概念的不断深化,作为“数字城市”最基础、最关键的技术“3维城市场景的制作”已成为数字化测绘的新技术亮点;本文在讲述3维城市场景制作的一般原则、方法和关键技术的基础上,着重讲解了在City-3D软件下制作城市3维场景的基本步骤和具体实施方案。 相似文献