共查询到20条相似文献，搜索用时 762 毫秒
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3D GIS与3D GMS中的空间构模技术 总被引：74，自引：12，他引：62
3DGIS和3DGMS是近10年来地学领域并行发展的两大领域,该文从研究对象,数据来源,空间参照,空间构模,拓扑描述,空间量算,空间分析及应用领域等方面分析了3DGIS和3DGMS异同,并从数学模型,高程特征,属性特征和构建方式等方面讨论并重新界定了空间维数问题,重点分析了空间构模技术,将3D GIS和3D GMS中的空间构模分为基于面模型,基于体模型和混合构模3大类,并进行了分析比较和讨论,指出3D GIS和3D GMS将殊途同归,并最终建立全要素的真3D地球信息系统。 相似文献
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Elastic wave modelling in 3D heterogeneous media: 3D grid method 总被引：5，自引：0，他引：5
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基于紧密型二三维结合的GIS构架与系统实现 总被引：3，自引：0，他引：3
在三维系统中实时渲染二维图层是实现紧密型二三维结合GIS的关键.该文在二三维结合实现三维GIS的基础上,提出了基于LOD(Level of Detail)的二维图层与三维地形叠加的渲染构架和紧密型二三维结合GIS的初步系统构架,并利用ArcGIS Engine 开发包与World Wind开源软件实现了该原型系统.系统运行结果表明,该构架完全能够满足紧密型二三维结合GIS对渲染效果和效率的要求,成功解决了紧密型二三维结合系统的关键问题. 相似文献
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基于TIN的体布尔算法及其地质应用 总被引：3，自引：0，他引：3
提出一种基于TIN的体布尔操作算法,即采用快速碰撞检测方法、改进的三角形求交算法和三角形包含测试算法,能解决复杂地质体的交、并、差等布尔操作。该方法不仅可以有效处理具有侵入、交错等复杂空间关系的地质体建模问题,还适用于基于地质模型的工程分析应用,如开挖模拟等,并在北京市某岩土工程信息系统建设项目中得到了检验。 相似文献
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Peter van Oosterom Martijn Meijers 《International journal of geographical information science》2014,28(3):455-478
This paper introduces the concept of the smooth topological Generalized Area Partitioning (tGAP) structure represented by a space-scale partition, which we term the space-scale cube. We take the view of ‘map generalization as extrusion of data into an additional dimension’. For 2D objects the resulting vario-scale representation is a 3D structure, while for 3D objects the result is a 4D structure.
This paper provides insights in: (1) creating valid data for the cube and proof that this is always possible for the implemented 2D tGAP generalization operators (line simplification, merge and split/collapse), (2) obtaining a valid 2D polygonal map representation at arbitrary scale from the cube, (3) using the vario-scale structure to provide smooth zoom and progressive transfer between server and client, (4) exploring which other possibilities the cube brings for obtaining maps having non-homogenous scales over their domain (which we term mixed-scale maps), and (5) using the same principles also for higher dimensional data; illustrated with 3D input data represented in a 4D hypercube.
The proposed new structure has very significant advantages over existing multi-scale/multi-representation solutions (in addition to being truly vario-scale): (1) due to tight integration of space and scale, there is guaranteed consistency between scales, (2) it is relatively easy to implement smooth zoom, and (3) compact, object-oriented encoding is provided for a complete scale range. 相似文献
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Carlos Carbonell Carrera Bogdan Vlad Avarvarei Elena Liliana Chelariu Lucia Draghia Simona Catrinel Avarvarei 《The Journal of geography》2017,116(5):197-205
Landforms often are represented on maps using abstract cartographic techniques that the reader must interpret for successful three-dimensional terrain visualization. New technologies in 3D landscape representation, both digital and tangible, offer the opportunity to visualize terrain in new ways. The results of a university student workshop, in which traditional 2D versus 3D digital and tangible models were tested, suggest that map-reading skill development is greater when using the 3D technologies. 相似文献
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Jantien Stoter Henk de Kluijver Vinaykumar Kurakula 《International journal of geographical information science》2013,27(8):907-924
Noise mapping is the process of determining and visualizing noise impact on the environment in order to support environmental policies. Currently most noise impact studies are based on a 2D approach. The 3D output of noise simulation software is processed and visualized in 2D and combined with 2D topographical and other data, such as population distribution, to quantify the effects. The research described in this paper aims at improving visualization and assessment of noise impact on the environment by generating a 3D noise map in cases where 3D effects are relevant. Based on the specific demand, an approach is presented to generate a 3D noise map as a basis for noise impact studies. The proposed concept is proofed by applying it to a sample noise impact study. From experiences with the sample, it can be concluded that the 3D noise map offers significant insight in situations where 3D noise effects are relevant, i.e. in urban areas. Here, current 2D noise maps have limitations. In addition, more accurate assessment of noise impact is possible in particular when different floors of a building close to the noise source and/or behind noise barriers are considered. This paper also elaborates on accuracy aspects in all phases of noise modelling, including a presentation of initial experiments of 3D noise interpolation. 相似文献
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高勇 《地理与地理信息科学》2000,16(4):90-96
相位解缠是干涉合成孔径雷达 (INSAR)应用的重要步骤之一。本文通过一定的实验研究 ,对比分析了现有的几种主要的相位解缠算法的原理和特点。路径积分算法的局域算子和最小二乘算法的全局算子是这两类解缠算法的本质特征。而各种不同的算法对不同的数据也各自有其特定的适宜性 ,算法的选择应该视实际数据的特点而定。 相似文献
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提出一种基于支持向量机(SVM)的三维LiDar数据分类方法:利用kd-trees存储无序的点云数据,在局部邻域中利用点云数据间的几何关系估算植被表面特征值;将密度值和高程差值作为SVM输入特征变量,利用基于径向基函数的SVM方法实现植被点云数据的分类.实验结果为:OA分类精度达到94.31%,Kappa系数为89.53%.该方法操作性较强,在分类精度及计算效率方面比传统方法具有优势. 相似文献
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Antonio T. Mozas-Calvache Manuel Antonio Ureña-Cámara José Luis Pérez-García 《International journal of geographical information science》2013,27(12):2362-2374
This article describes a new methodology for the planimetric control of contour lines. The method is based on the generation of buffers around the contour lines which define a 3D buffer around the maximum slope line. After that we analyze the quantity of points from a more accurate source which is inside this buffer. As a result, we obtain a distribution function of the control points included when we apply several widths to the buffers. We have also determined the angularity and height differences of these points. The method has been applied to several sets of contour line intervals derived from a digital elevation model (DEM) and to the contour lines of one published topographic map using the DEM as the control source. We have also analyzed the representative behaviour of the contour lines, taking into account the contour line interval and the detection of an uncertainty model based on the slope variation. This study demonstrates the viability of the proposed method for obtaining the uncertainty of the contour lines depending on a given level of confidence and the variability of this uncertainty in the map. Finally, we propose a range of contour line intervals based on the scale and slopes. 相似文献
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极地天然气水合物分布于南北极大陆及其毗邻海域的沉积物（岩）中,与广泛分布的永久冻土带密切相关,资源潜力巨大。极地天然气水合物储层类型主要为富砂沉积物储层,能提供天然气水合物高浓度聚集所需的储集渗透性,最可能实现远景勘探和商业利用。随着全球气候变暖,北冰洋海冰加速融化和航道开通,北极地区蕴藏的丰富资源都将从潜在利益变成现实利益,各国的权益纷争也将愈演愈烈。本文综述了极地天然气水合物勘探开发现状和相关国家的水合物开发政策,依据中国海陆域天然气水合物勘查开发现状,提出了中国参与极地天然气水合物研究和开发的思路和途径,为中国极地资源开发利用战略提供参考。 相似文献
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区域旅游发展是一个复杂的动态系统,在这个系统内旅游者、旅游资源、旅游环境、经济与社会等要素相互作用。运用系统分析法,从旅游活动的主体和核心、旅游发展的物质基础、区域旅游发展的依托以及旅游发展的目的等各方面对旅游系统的要素进行分析。旅游系统的发展要落实到一定的空间和时间,在对区域旅游系统研究的基础上,从要素维、空间维、时间维三个维度对区域旅游可持续发展的内涵进行了全面的综合分析。 相似文献
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Zhang Zhiqiang Zhang Jiaojiao Wang Gongwen Carranza Emmanuel John M. Pang Zong Wang Hao 《Natural Resources Research》2020,29(1):345-364
Natural Resources Research - The Wulong gold district (WGD) is located at the northeastern margin of the North China Carton (NCC) on the Liaodong Peninsula, China. The results of early mineral... 相似文献
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3D seismic technology: the geological 'Hubble' 总被引：3，自引：0，他引：3
The proliferation of three‐dimensional (3D) seismic technology is one of the most exciting developments in the Earth Sciences over the past century. 3D reflection seismic data provide interpreters with the ability to map structures and stratigraphic features in 3D detail to a resolution of a few tens of metres over thousands of square kilometres. It is a geological ‘Hubble’, whose resolving power has already yielded some fascinating (and surprising) insights and will continue to provide a major stimulus for research into geological processes and products for many decades to come. Academic and other research institutions have a major role to play in the use of this data by exploiting the enormous volume of geological information contained in 3D seismic surveys. This paper reviews some of the recent advances in basin analysis made using the medium of 3D seismic data, focusing on the fields of structural and sedimentary geology, fluid–rock interactions and igneous geology. It is noted that the increased resolution of the 3D seismic method provided the essential catalyst necessary to stimulate novel observations and discover new geological structures such as mud diapir feeders, km‐long gas blow‐out pipes, giant pockmarks and sandstone intrusions, and to capture the spatial variability of diagenetic fronts. The UKs first impact crater was also discovered using 3D seismic data. The potential for future developments in this field of geophysical interpretation is considerable, and we anticipate that new discoveries will be made in many years to come. 相似文献
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海量三维地形数据集的流式处理 总被引：1，自引：0，他引：1
该文提出基于网络实时交互的海量三维地形数据的流式处理方案。通过一个输出恒定的动态多分辨率简化算法,对三维地形数据进行裁剪简化,实现与总数据量和视点位置无关的恒定数据量输出;在算法输出的非均匀高程矩阵上,进一步采用三维地形数据流式编码解码算法,将高程矩阵进行离散余弦变换到频率域,并根据频谱分析结果引入累进式传输编码解码,结合服务质量控制,根据客户端和网络的性能状况进行自适应调节。实验表明,流式处理方案可以根据运行平台性能提供不同质量的场景复原,达到基于网络的实时交互性能。 相似文献