共查询到20条相似文献，搜索用时 953 毫秒
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RS,GIS一体化土地利用现状信息提取研究：以广西壮族自治区为例 总被引：8，自引：0，他引：8
香宝 《地理学与国土研究》1999,15(3):91-93
回顾土地利用现状信息提取的方法,报道ＲＳ,ＧＩＳ一体化土地利用现状信息提取的技术路线,结合广西自治区人机互式数字影像判读实际建立的屏幕影像地物判读标志,阐述ＲＳ,ＧＩＳ一体土地利用现状信息提取方法的优点和应用前景。 相似文献
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香宝 《地理与地理信息科学》1999,(3)
回顾土地利用现状信息提取的方法,报道 Ｒ Ｓ, Ｇ Ｉ Ｓ 一体化土地利用现状信息提取的技术路线,结合广西自治区人机交互式数字影像判读实际建立的屏幕影像地物判读标志,阐述 Ｒ Ｓ, Ｇ Ｉ Ｓ 一体化土地利用现状信息提取方法的优点和应用前景 相似文献
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GIS及其在三高农业规划中的应用初探 总被引：2，自引：0，他引：2
本文简要介绍了地理信息系统（ＧＩＳ）的基本概念及功能,并尝试把ＰＣ ＡＲＣ／ＩＮＦＯ应用于三高农业规划。通过实例应用,认为ＧＩＳ在三高农业规划及管理方面具有广阔的应用前景。 相似文献
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云南省GIS事业的回顾与云南省地理研究所3S中心的发展 总被引：1，自引：1，他引：0
计算机技术的飞速发展与信息的社会化带动和推动了地理信息系统（ＧＩＳ）的发展。ＧＩＳ的广泛应用表明了ＧＩＳ在社会中需求地位和价值。云南的ＧＩＳ同全国一样走过了起步、建设到发展的过程。云南地理研究所的３Ｓ（ＧＩＳ、ＲＳ、ＧＰＳ）中心在云南ＧＩＳ的事业中占有主要的地位,３Ｓ中心的发展方向会不同程度地影响云南省ＧＩＳ事业的发展方向和进程。在回顾云南ＧＩＳ发展的历程后提出今后３Ｓ中心的发展方向与工作奋斗目标 相似文献
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GIS系统集成的理论与实践 总被引：61，自引：0，他引：61
本文探讨了ＧＩＳ系统集成的若干理论问题，集成系统的体系结构及系统集成的方法与步骤，并结合作者在“八五”攻关课题“洪水灾害遥感监测与评估技术研究”以及“重大自然灾害遥感监测评估集成系统研究”中的实践，介绍了集成的内容和若干工程性提出了运用对象连接与嵌入技术实现模型与ＧＩＳ动态集成的方法。 相似文献
6.
土地利用管理动态信息系统的建设思路 总被引：4，自引：0，他引：4
在ＲＳ、ＧＩＳ与ＧＰＳ三“Ｓ”一体化技术的支持下,从系统目标、信息源及其更新、规范化与标准化、系统层次、系统设计、系统实现和实施方案诸方面探讨土地利用动态管理信息系统的建设思路。 相似文献
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GIS互操作中的异质性问题探讨 总被引：2，自引：0，他引：2
划质环境下的ＧＩＳ互操作,已成为ＧＩＳ研究领域中日渐受到重视的问题。异质性是ＧＩＳ互操作的一大障碍。本文探讨了ＧＩＳ互操作中的异质性问题及解决方法。 相似文献
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结合应用ＭＡＰＧＩＳ地理信息系统制作《河南省城市地图集》的实践,分析了ＭＡＰＧＩＳ制图系统的基本原理及方法;总结了数字地图制图技术要点及优势;指出目前应完善ＭＡＰＧＩＳ功能,强化ＭＡＰＧＩＳ智能化水平,以加快ＧＩＳ产业化进程。 相似文献
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地理信息系统及其应用 总被引：2，自引：0，他引：2
介绍地理信息学的发展与地理信息系统（ＧＩＳ）的构成和功能，以北京大学遥感与ＧＩＳ研究所开发的“城市之星”为支撑软件，建立沧州市综合市情管理系统，探索地理信息系统在决策管理中的应用。 相似文献
11.
地图符号的语言学机制及其应用研究 总被引：9，自引：0，他引：9
分析并总结地图语言学在GIS技术影响下的发展、变化;通过分析当今地图语言的新特点,阐述地图符号的定义;从语言学角度分析地图符号的语言学机制并提出地图符号的语义概念模型。最后简述该模型在地图符号软件中的应用。 相似文献
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特征参数的抽取,是实现地形图中点状符号自动识别的关键。本文根据点状符号在扫描图中可能出现的旋转、缩放等情况,归纳和总结出了４种易于计算的不变性特征,并给出了这些特征的提取方法和部分实验结果。这４种特征参数是:复杂度——用以描述符号外围的复杂程度;扁率——用以反映符号的扁平程度;比重——符号的黑色部分在其整个覆盖区域中所占的比例;偏心率——用以反映符号重心与符号的几何中心的偏离程度。这４种特征参数具有旋转不变性和大小不变性,且便于提取、容易计算。 相似文献
14.
Jiangfeng She Chuang Li Jiaqi Li Qiujun Wei 《International journal of geographical information science》2018,32(3):476-497
With the extensive application of virtual geographic environments and the rapid development of 3D visualization analysis, the rendering of complex vector lines has attracted significant attention. Although there are many rendering algorithms in 3D geographic information system (GIS), they are not sufficiently flexible to meet the requirements for rendering linear symbols composed of diverse colors and shapes. However, the interactive rendering of a scene and the accuracy of the symbols are important components for large-scale, complex vector lines. In this paper, we propose a graphics processing unit (GPU)-accelerated algorithm for rendering linear symbols on 3D terrain. Symbol rendering is embedded within the terrain-rendering process, and vector lines are encoded in a 3D texture and then transferred to the GPU. A set of visual properties are used to enrich the expression of symbols with the help of geometric operations in the fragment shader. A series of experiments demonstrate that the proposed method can be utilized for drawing various pixel-exact linear symbols and can achieve real-time rendering efficiency. 相似文献
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面向GIS的矢量线状符号填充算法研究 总被引：3，自引：0，他引：3
该文分析了GIS中矢量线状符号的特点与基本构成,提出了一种高效且通用的矢量线状符号的填充算法。该算法通过对构成矢量线状符号的几何图元进行旋转、变形、裁减等处理,可以实现对各种线状符号的填充,大大提高了算法的通用性和绘制效率。 相似文献
16.
Abstract The paper describes the developmental history of a software package for computer-assisted drafting of graduated symbol maps. Given the machinery prevalent 10 years ago, the first version was implemented on a mini-computer with vector-oriented devices, such as mechanical plotters and storage tube terminals. The programs provide functions for plotting graduated symbols of various forms, legends and Line drawing. To improve map legibility the hidden areas in cases of overlapping symbols are removed. The visual separation of the symbols is enhanced by a halo effect, a small gap between the symbols, or the symbols and map background. New hardware required the reprogramming of the package to exploit the extended capabilities of new computers and graphic devices, including colour and hardware area fill. To increase flexibility, portability and maintainability, the graphic standard GKS (Graphical Kernel System) has been used as a device-independent software interface for the third generation of the package. 相似文献
17.
论旅游地图编制内容更新的若干问题 总被引：3，自引：0，他引：3
本文是在《新疆维吾尔自治区旅游图》、《新疆与周边国家导游图》、《丝绸之路图》的编制实践中,结合目前市场上出版发行的十多种旅游地图进行比较分析,进而指出从中发现的问题,提出区域性旅游地图编制内容更新值得探讨的若干问题。 相似文献
18.
《The Journal of geography》2012,111(8):35-52
Abstract Crucial aspects of the referent phenomena which provide the subject matter for cartographic symbolism are often overlooked by map interpreters in their haste to “read maps at a glance.” The blame rests largely on those practitioners of the environmental sciences who stress the simple, intuitive nature of maps, while effectively ignoring the true complexity of the cartographic communication process. Those persons who are responsible for traditional map interpretation training programs are also at fault for implying, through long emphasis, that symbol identification, position location, and navigation constitute the essence of map analysis. The intuitive acceptability of map symbols in spite of their abstract character is also a deceptive factor. The fact that there is far “more than meets the eye” to map interpretation is easily demonstrated by looking closely at several basic cartographic symbols. In order to become an effective map user the environmental scientist apparently must go well beyond the mastery of conventional map reading principles and learn to deal with diverse informational dimensions in the context of the map use purpose and the physical/cultural make-up of the geographical region under study. 相似文献
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Maps designed for and used by sighted audiences benefit from map symbol standardization and convention but, with very limited exception (most notably two European projects), neither standardization nor convention guides the design and use of symbols for tactile maps. In this project, we developed and field tested symbolization for and use of tactile street maps. The development process included consultation with the literature as well as with field experts (orientation and mobility teachers, Braillists, and teachers working with students who are blind or have low vision). Following development, we undertook a three-year field testing and validation phase, in which we conducted pilot testing and formal testing with travelers who are blind or have low vision. Research results reveal not only a discriminable and useful tactile symbol set but also environmental feature use by travelers who are blind or have low vision. 相似文献
20.
Zhilin Li Peizhi Huang 《International journal of geographical information science》2013,27(7):699-709
The map is a medium for recording geographical information. The information contents of a map are of interest to spatial information scientists. In this paper, existing quantitative measures for map information are evaluated. It is pointed out that these are only measures for statistical information and some sort of topological information. However, these measures have not taken into consideration the spaces occupied by map symbols and the spatial distribution of these symbols. As a result, a set of new quantitative measures is proposed, for metric information, topological information and thematic information. An experimental evaluation is also conducted. Results show that the metric information is more meaningful than statistical information, and the new index for topological information is more meaningful than the existing one. It is also found that the new measure for thematic information is useful in practice. 相似文献