共查询到20条相似文献,搜索用时 218 毫秒
1.
通过分析传统2维地图与3维虚拟场景在电力选线设计中的技术作用及特点,阐明了二者交互结合在电力选线中的必要性,并分别从2维地图模块设计与3维虚拟场景模块设计出发,实现了2维地图与3维虚拟场景的交互,最终为电力选线设计提供了便利. 相似文献
2.
FU Yong-heng 《测绘学院学报》2007,(Z1)
从传统的2维地图发展到电子地图和3维可视化地理环境的过程中,地理信息的表达从2维到3维是一次飞跃。2维地图符号系统作为成熟的地图表达方式在3维可视化环境中仍然有用。2维地图符号系统有其自身的特点和优点:体系成熟,易于认知,易于实现。论述了目前3维可视化环境下传统2维(电子)地图符号的应用特点和二者之间的辩证关系,探讨了3维可视化环境下地理信息表达和地图符号设计的一些原则。 相似文献
3.
2维地图符号与3维可视化的关系 总被引:1,自引:0,他引:1
付永恒 《测绘科学技术学报》2007,24(Z1):73-75
从传统的2维地图发展到电子地图和3维可视化地理环境的过程中,地理信息的表达从2维到3维是一次飞跃.2维地图符号系统作为成熟的地图表达方式在3维可视化环境中仍然有用.2维地图符号系统有其自身的特点和优点:体系成熟,易于认知,易于实现.论述了目前3维可视化环境下传统2维(电子)地图符号的应用特点和二者之间的辩证关系,探讨了3维可视化环境下地理信息表达和地图符号设计的一些原则. 相似文献
4.
霍焱;郑娇;张德鑫;曹殿才;张慧 《东北测绘》2013,(4):132-133
随着城市空间利用多元化的不断深入,地籍管理中2维宗地图常因界址不明而引发土地纠纷,这种2维地籍管理模式已不能真实、直观地表现土地的3维立体化利用情况。当前,3维地理信息技术与地籍管理的结合,产生了一种崭新的地籍管理模式——3维地籍管理。3维地籍管理在实践中取得了较好的效果,是未来城市地籍管理的一种重要手段。本文以长春市城区3维地籍数据库系统建设为例,详细介绍了该系统的设计思路以及功能实现,并对其关键技术进行分析。 相似文献
5.
文中分析总结了地图表达形式、价值能力、评价标准、设计者和使用者相互关系以及符号认知规律等的历史演变,提出在当今的全球网络时代,地图学理论工作者和地图系统研发者有责任重新定义地图的范畴并采用可用性作为地图的评价标准。就地图科学的发展趋势而言,作者以为3维仿真虚拟地理环境的普及给地图学提供了新的生长点,而正在兴起的3维非仿真虚拟地理环境将进一步保持和发扬传统地图的科学价值并使可视化技术走向可视化学。 相似文献
6.
基于3维地图的符号设计与研究 总被引:1,自引:0,他引:1
伴随着信息化时代的到来,人们对地理环境的描述从传统的2维地图进入到电子地图、3维虚拟地理环境。地理信息的表达从2维到3维带来一次飞跃,在虚拟的3维空间里产生了相应的3维地图符号。3维地图符号是现代地图学理论、计算机理论和虚拟现实技术结合的产物。本文在调查实验的基础上,分析了3维地图符号的图形学、设计特点与原则等,对3维地图符号设计、提高符号表现力等进行了一些理论探讨和实践尝试。 相似文献
7.
地图学技术发展中的几点理论思考 总被引:29,自引:7,他引:22
孟丽秋 《测绘科学技术学报》2006,23(2):89-96,100
文中分析总结了地图表达形式、价值能力、评价标准、设计者和使用者相互关系以及符号认知规律等的历史演变,提出在当今的全球网络时代,地图学理论工作者和地图系统研发者有责任重新定义地图的范畴并采用可用性作为地图的评价标准.就地图科学的发展趋势而言,作者以为3维仿真虚拟地理环境的普及给地图学提供了新的生长点,而正在兴起的3维非仿真虚拟地理环境将进一步保持和发扬传统地图的科学价值并使可视化技术走向可视化学. 相似文献
8.
基于全景图的3维实景制作及其与GIS集成研究 总被引:1,自引:0,他引:1
3维实景技术是一种基于图像绘制的虚拟现实技术,使用真实的照片展现场景达到沉浸式虚拟漫游的效果,提供给用户良好的交互性。本文提出了一种利用全景图制作3维实景并将其与GIS集成的方法:首先对拍摄的鱼眼照片进行球面投影,然后配准拼接成球面全景图,利用全景图制作3维场景,实现3维场景的漫游并将3维实景集成于已有的GIS系统。本文以华东师范大学校园3维实景漫游系统及基于Google Maps的3维实景地图开发为例,介绍方法流程。与传统的2维地图相比,3维实景地图更加直观且更具真实性。 相似文献
9.
从环境风险源的可视化管理和应急辅助决策出发,提出了基于3维全景地图的环境风险源管理系统的技术架构,研究了3维全景地图数据的建设过程,并基于3维全景技术实现了环境风险源的全面管控,其研究成果对于其他省市环境风险源的日常监管、应急处置等具有较好的参考价值。 相似文献
10.
11.
none 《The Cartographic journal》2013,50(3):266-274
AbstractWhile graphic variables in 2D maps have been extensively investigated, 4D cartography is still a widely unexplored field. In this paper, we investigate the usefulness of 4D maps (three spatial dimensions plus time) for cartographically illustrating spatio-temporal environmental phenomena. The presented approach focuses mostly on explorative research rather than on enhancement and extension of existing methods and principles. The user study described in the paper shows that 4D cartography is not a well-explored research area and that many experienced map users try to apply their knowledge from 2D maps to 4D dynamic visualisations. Thus, in order to foster the discussion within the community, we formulated several basic research questions for the area of 4D cartography, which range from methods for representing time in 4D visualisations and understanding the temporal context to finding generic methods to achieve optimized temporal generalisation and a consistent definition of graphical variables for 3D and 4D. 相似文献
12.
13.
14.
2维地图显示从PC平台到PDA的发展是地理信息系统多元化、跨平台的一次飞跃。本文通过对嵌入式系统的研究,在Windows CE平台下开发2维地图显示应用系统,克服了PDA内存小、处理速度慢等硬件限制,实现了2维地图在PDA客户端的快速显示,并对一些关键技术进行了深入研究。 相似文献
15.
3维文字注记对于直观表达3维场景中对象的文本信息非常重要,但现有研究大多忽略这一问题,该文主要针对城市环境3维建筑物模型的注记问题,提出一种基于视点位置和方向的动态注记方法。该方法依据3维模型离视点的远近对文字注记位置进行分层处理。在视点远近变换时,选取建筑对象的不同细节层次模型作为文字注记的计算对象。进而依据视点的方向实时计算文字注记的方向,达到动态的注记效果。这种动态的注记方法可以避免因视点变换而产生的注记与3维模型之间的遮挡关系,也可以避免场景因注记过多而产生的杂乱情形。实验表明,该方法具有较好的可视化效果。 相似文献
16.
17.
《制图学和地理信息科学》2013,40(4):264-272
This paper reports the results of an in-depth study which investigated two algorithms for line simplification and caricatural generalization (namely, those developed by Douglas and Peucker, and Visvalingam, respectively) in the context of a wider program of research on scale-free mapping. The use of large-scale data for man-designed objects, such as roads, has led to a better understanding of the properties of these algorithms and of their value within the spectrum of scale-free mapping. The Douglas-Peucker algorithm is better at minimal simplification. The large-scale data for roads makes it apparent that Visvalingam's technique is not only capable of removing entire scale-related features, but that it does so in a manner which preserves the shape of retained features. This technique offers some prospects for the construction of scale-free databases since it offers some scope for achieving balanced generalizations of an entire map, consisting of several complex lines. The results also suggest that it may be easier to formulate concepts and strategies for automatic segmentation of in-line features using large-scale road data and Visvalingam's algorithm. In addition, the abstraction of center lines may be facilitated by the inclusion of additional filtering rules with Visvalingam's algorithm. 相似文献
18.
《The Cartographic journal》2013,50(4):343-359
AbstractWhen one thinks of a map depicting London, generally the image that appears is that of the map designed by Henry (Harry) Beck (1902–1974). It has become a design icon despite the fact that it eschews topography (other than the River Thames) and focuses on the simplified depiction of the topology of the Underground rail network. Beck’s map, designed in 1931, and first made available to London commuters in 1933, has become the image of the geography of London and, generally, the mental map that defines how London ‘works’. Station names have become synonymous with the above-ground landscape and the network is such that most of London’s landmarks can be readily located through the map. Navigating between them is a simple process and while the city above is a socio-economic and cultural soup, the simplicity of the map brings a sense of order, structure and sensibility. It is a perfect counterpoint to the chaos at street level. In cartographic terms, Beck’s map works and marries form with function perfectly. It retains the status of ‘the’ map of London and manages to simplify the network, be harmonious, coherent, balanced and all with minimal topographic distortion. The symbols are clear and well crafted; the composition and layout, though somewhat challenged by network changes since 1933, remains useful; and the design has remained relatively unchanged over the last 80 years which creates stability in appearance and breeds confidence in its use. However, this paper asserts that Beck’s map is over-used in myriad ways beyond the reason for its invention. The effect of such abuse has perhaps been to dilute its own place in cartographic history. There have been many official iterations that have not always successfully married Beck’s design ideas with network changes; other metro maps have often tried to imitate but with mediocre success; and the map is perpetually used as a template for mimics and alternatives. The map has become a model for parody which we assert is bad for the map and potentially damaging for cartography. 相似文献
19.
地图是测绘地理信息的一个重要领域,它作为一种信息载体,与人们的日常工作生活密切相关。地图在中国已经有着四千余年的历史,古往今来,互联网、移动互联网和车联网的现代社会赋予了地图新的使命和职责。本文从地图的过去、现在和未来等时间维度探索地图在民生领域中的实际运用以及对人类生活产生的广泛而深刻的影响。 相似文献
20.
自第一台计算机诞生以来,计算机技术迅速发展,并在各行各业中得到广泛应用。3维显示技术是随着计算机软硬件的快速发展而兴起的一个新的应用方向。它能在计算机中为用户提供一个3维的直观环境,通过视觉提高真实感。随着地理信息产业的快速发展,人们对3维地理空间支撑的需求越来越强烈,"数字城市"项目在各大城市如火如荼的发展,3维GIS进入了高速发展和广泛应用的新时期。这里探讨了综合运用3dsMax,Arc Map,creator,CAD,PhotoShop等软件制作3维地物模型的过程。 相似文献