共查询到20条相似文献，搜索用时 109 毫秒
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针对网络三维虚拟地球中对大范围、高密度复杂三维模型高效绘制的要求,设计了面向GPU绘制的三维模型数据组织结构。在此基础上,提出了面向GPU绘制的三维模型纹理烘焙和多尺度可视化方法。基于开放式虚拟地球集成共享平台GeoGlobe进行了实验,比较了传统绘制方式和基于GPU的绘制方法在可视化效果和效率上的区别。实验表明,本文提出的方法在保持三维模型特征条件下能有效提高其绘制效率。 相似文献
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首先分析了大范围有源洪水淹没分析方法的研究现状。然后面向三维虚拟地球应用,基于全球地形数据组织方法,提出了一种以地形瓦片为单元的有源洪水淹没分析算法,实现了三维虚拟地球中的大范围有源洪水淹没分析。最后基于开放式三维虚拟地球集成共享平台软件GeoGlobe进行了实验,验证了该方法的有效性。 相似文献
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本文提出了基于对象关系型数据库的管线三维数据组织方法，实现了管线数据的三维表达，用于城市三维地下管线地理信息系统。 相似文献
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面向虚拟地球的三维气象场可视化方法 总被引：1，自引：0，他引：1
《武汉大学学报(信息科学版)》2016,(12)
三维气象场是一个多维变化的环境,可视化是研究其内在规律的重要方法。针对三维气象场的全球范围、多维多尺度、海量数据等特征,提出了基于体元对象的数据模型和多级体元索引机制,并在此基础上设计了面向三维气象场的可视化方法,包括基于箭头模型的矢量场可视化方法和改进后的基于三维纹理映射体绘制的标量场可视化方法。最后基于虚拟地球平台进行了可视化和时空检索分析实验。实验验证了该方法的可行性和有效性。 相似文献
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地理信息系统中时空多维数据可视化技术研究 总被引：23，自引：0，他引：23
将科学可视化技术应用于地理信息系统之中,增强地理信息系统对时空多维数据的显示,处理胆当前的研究热点之一。通过对现有地理数据组织,显示简便概述的基础上,提出一种基于体素的时空多维数据组织方式。并通过二维,三维显示及动画形式的研究,从技术上对科学可视化与地理信息系统的结合进行初步的探索。 相似文献
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《测绘科学技术学报》2013,(2)
在基于正射影像的立体辅助影像制作方法和海量三维地形可视化等关键技术的研究基础上,综合虚拟三维地形和立体像对三维地形的优点,提出了一种新的双模式三维地形景观构建和显示方法。该方法利用正射影像、立体辅助影像和数字高程模型(DEM)等基础数据,生成基于正射立体像对的真三维立体景观和基于正射影像、DEM的虚拟三维地理景观有机结合的双模三维立体环境,在统一的数据组织、调度和景观漫游引擎的驱动下实现了两种三维场景的动态漫游、无缝切换和数据互联。 相似文献
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实时GIS时空数据模型 总被引：4，自引：0，他引：4
为满足动态目标与传感器等实时观测数据获取、存储、管理、分析与可视化的要求,需要发展一种新型地理信息系统—实时GIS。本文根据实时GIS中各种地理要素的特点以及存贮管理要求,提出了一种面向动态地理对象与动态过程模拟的实时GIS时空数据模型,它将时空过程、地理对象、事件、事件类型、状态、观测等相关要素整合在一个时空数据模型中。基于该模型研发了新一代实时GIS,并以四种动态地理对象（包括移动对象、原位传感器对象、视频对象和过程模拟对象）的时空数据的实时接入、存储与可视化为例,验证的模型的可行性。 相似文献
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《International Journal of Digital Earth》2013,6(4):293-311
We address the registration problem of multisource three-dimensional (3D) human-made buildings with remote sensing images and the earth's surface in the context of virtual globes. Challenges include fast transformation of 3D coordinates with different reference systems as well as the efficient use of original model information for rigorous and accurate model registration. This paper introduces a novel fast and scalable registration approach that can establish correspondences between heterogeneous external 3D city models and images/terrain surfaces of virtual globes in an efficient and accurate manner. The approach utilizes the projected 3D feature information of 3D city models to develop robust coordinate transformation and reliable model registration methods. The proposed approach builds a solid foundation for the fusion of multisource geospatial data in a united virtual globe reference framework. We report experimental results of online registration tasks for up to over 13K buildings in an integrated 3D virtual globe platform, namely, GeoGlobe. 相似文献
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Virtual globes enable the combination of heterogeneous datasets for optimal routing analyses in transportation, environmental ecology, and construction engineering. In this study, considering the advantages of the hierarchical tiling structure and topography of virtual globes, we propose a tile‐based optimal routing method for large‐scale road networks in a virtual globe. This method designs a topographically preserved road‐network tile model by partitioning roads into tiles and constructs the road‐network pyramid from the bottom to the top. During construction, a TileArc is calculated and flagged as the shortest path in a tile. Based on the built road‐network pyramid carrying hierarchical TileArcs, a multi‐level and flexible shortest path query can be executed efficiently. The proposed method is implemented with large road networks with different road grades in a virtual globe. Experimental results verify its validity, efficiency, and exactness. Moreover, the length of the shortest path with surface distance is approximately 1.3 times longer than that with Euclidean distance. 相似文献
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《International Journal of Digital Earth》2013,6(6):431-450
Typhoons are usually accompanied by strong winds, heavy rain, storm surges and other disastrous events, and they are the most severe weather phenomena in the western part of the North Pacific Ocean. Visualisation is a key technology for analysing and presenting climate simulations and observations together with related social and ecological data. Virtual globes are a logical platform for visualising such geospatial data via the Internet. To implement interactive visualisation of typhoon data within virtual globes, this study provides a 3D texture-mapping algorithm to render volume textures on a globe. In addition, a systematic framework is proposed in which a hierarchical octree-based multiresolution data structure is implemented to organise the large volume dataset, and a graphics processing unit-based dynamic interpolation approach is proposed to obtain a smooth effect. Finally, the structure is combined with a level of detail strategy to enable the rendering of dynamic volumetric data at an acceptable interactive frame rate. To demonstrate the capabilities of this framework, data for a simulated typhoon event were rendered in World Wind, an open-source virtual globe. The experimental results demonstrate that the application of the proposed strategies can result in an interactive visualisation performance that renders typhoon data on virtual globes. 相似文献
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Yuan-Ko Huang 《Journal of Geographical Systems》2014,16(2):139-160
Efficient processing of spatiotemporal queries over moving objects with uncertainty has become imperative due to the increasing need for real-time information in highly dynamic environments. Most of the existing approaches focus on designing an index structure for managing moving objects with uncertainty and then utilize it to improve the query performance. All the proposed indexes, however, have their own limitations. In this paper, we devote to developing an efficient index, named the R lsd -tree, to index moving objects with uncertain speed and direction varying within respective known ranges. We design several pruning criteria combined with the R lsd -tree to answer the probabilistic range queries. Moreover, two models, the sampling-based probability model and the ER-based probability model, are proposed to quantify the possibility of each object being the query result. Finally, a thorough experimental evaluation is conducted to show the merits of the proposed techniques. 相似文献
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随着信息技术的飞速发展,3维空间信息系统成为国内外行业厂商和研究机构关注的重点,如Google的Google Earth。针对3维地理信息模型、瓦片金字塔技术、数据请求调度策略、可视化全球地形模型等相关的关键技术进行了分析,并描述了我们开发成功的3维实景地理信息网络平台及其应用。 相似文献
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针对农村土地承包经营权确权登记成果海量数据需要实现信息化、动态化、网络化管理的需要,为满足省市县农经业务的互联互通,文中研究基于政务云平台的农村土地承包管理信息系统的实现。基于矢量栅格一体化切片的农经权地图服务框架,实现省市县地块与权属成果的集成展现、快速检索;采用多种地图渲染方式,实现多样化的地类显示,提供多入口多渠道的"以人查地,以地查人"的查询方式实现调查成果的综合展示;基于政务云业务权限控制策略,建立省、市、县三级农经权业务监管体系。系统通过在浙江省12个试点县市的试运行,能满足集成展现地块及业务成果、快速检索农经权属信息、高效办理日常业务的需求,实现省、市、县成果管理及业务办理的互联互通,为农经权业务管理提供高效支撑平台。 相似文献
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台风作为一种热带气旋,是影响我国东南沿海区域的主要灾害性天气。台风可视化是台风研究及预报应用的重要组成部分,在防灾减灾中发挥着重要作用。但是由于数据量巨大,台风动态交互可视化很难在网络环境下实现。虚拟地球技术的出现提供了一个新的网络可视化平台,提高了公众参与的能力,但是其很难支持专业的气象应用。基于开源的虚拟地球平台构建台风动态可视化环境,首先介绍了坐标转换、数据组织和基于GPU的体可视化这些关键技术,然后详细介绍了系统的主要功能,并在World Wind开源平台上实现相关功能的开发,最后通过一个具体的案例证明了系统的有效性和实用性。 相似文献
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基于2DSTMON(2-Dimensional spatio-temporal indexfor moving objects in network)二维时空数据模型,提出了一种新的二维网络中移动对象的时空索引2DSTI及其时空查询算法。这种二维时空索引机制简单且易于实现,支持当前轨迹数据和历史轨迹数据的大量时空查询操作。在此基础上,通过实验实现并验证了二维时空索引机制及其时空查询算法。 相似文献