共查询到20条相似文献,搜索用时 109 毫秒
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地图是由符号构建的“大厦”,干差万别的地图符号又是由基本图像元素排列组合而成的。常将构成地图符号的基本图像元素称之为“视觉变量”。 相似文献
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地图符号设计新思考(四)--地图符号设计的要领 总被引:1,自引:0,他引:1
说起地图符号首先应该提到几何符号,它是由圆形、三角形、方形、梯形、五角形以及六边形等几何图形组合而成.通过基本图形的视觉变量的变化.可以组成形态各一的几何符号家族.见图1。 相似文献
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视觉变量是微地图在设计表达过程中的关键部分,该文针对现有视觉变量研究成果并不完全适用于微地图这一问题,研究并提出了微地图符号的视觉变量.通过对比分析微地图与常用地图的不同,得到了微地图符号简单化、多元化、个性化、模块化的特点,在此基础上提出了符合微地图符号特点的视觉变量表达方式;考虑用户、环境、地物3个方面的影响,应用微地图视觉变量设计了微地图符号;实现了校园导航微地图的设计,并运用问卷调查验证了微地图视觉变量表达及应用的合理性.结果表明,提出的理论及方法能较好地表达微地图内容,能够为微地图的应用提供理论支持. 相似文献
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三维地图符号视觉参量研究 总被引:7,自引:0,他引:7
在常规地图符号参量体系上,通过引入动态特征、交互式操作等方面的参量,提出了三维地图符号的视觉参量,它由状态、动态变化和操作三个方面的参量组成,并采用认知实验研究了这些符号参量在质量特征、数量特征、关系特征以及动态特征等信息表达上的应用及功效。 相似文献
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在地图内容和形式数学表示的基础上研究了地图的数学定义。由于引入隐式地图和变换条件,故所有储存地图信息的载体均可属于地图的范围,从而使地图定义获得了广义的解释和精确的表达。 相似文献
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What Does ‘GIS’ Mean? 总被引:5,自引:0,他引:5
Nicholas R. Chrisman 《Transactions in GIS》1999,3(2):175-186
Many definitions of 'GIS' have been proposed, but they are rarely discussed in the peer-reviewed literature. Most definitions in active use have serious limitations. Recent literature includes a variety of proposals to redefine GIS by changing the third word. This paper proposes an extended definition accompanied by a condensed form that contains the key concepts: '–' 相似文献
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Summary . It is well known that for the comparison and combination of geodetic networks their heterogeneous datum definitions are
well to be considered. Various algorithms have been developed for this purpose. As an alternative concept to deal with hybrid
datum problems, the operator parallel sum of matrices is introduced in this paper. To begin with, a definition is given and some basic properties are explained. To demonstrate
the usefulness of the operator, two practical applications are given. The first deals with the estimation of parameters describing
the deformation of two networks which are to be compared to each other. The second one treats the estimation of parameters
representing the heterogeneous datum definitions of two networks which are to be merged into a hybrid network. It will be
shown that – regardless of the datum definitions of the preadjusted individual networks – the parallel sum of matrices can
be used to simplify the algorithms applied for the estimation of those parameters.
Received 15 December 1995; Accepted 24 September 1996 相似文献
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In recent decades, there is an increasing need for harmonised and accurate information on the status and extent of forests. However, delineating the extent of forest areas is a complex task, since the existence of more than 100 definitions of forest worldwide causes considerable discrepancies in forested area estimates. The aim of this work was to examine the potential of geographic object based image analysis (GEOBIA) and very high spatial resolution imagery to discriminate forest areas following two different definitions of forest in northern Greece. In particular, we examined the definition of forest under the Greek law as well as the United Nations Food and Agricultural Organisation definition. Our findings suggest that the developed GEOBIA approach not only performed remarkably well for the discrimination of forest areas but also allowed to estimate rapidly and reliably forest extents when the two aforementioned forest definitions were employed. 相似文献
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Definitions of categories in existent geospatial ontologies are an invaluable source of information because they provide us with essential knowledge about concepts and their properties. A closer examination reveals that definitions also contain supplementary linguistic items, which are mainly qualitative expressions, such as quantifiers. This inclusion of modifiers in definitions affects the way values are assigned to the categories’ properties (semantic properties and relations). This paper introduces a methodology for: (1) representing the essence of qualitative information to clarify the identity relations among categories; and (2) assessing their semantic similarity in order to disambiguate the taxonomic structure of existent geospatial ontologies. 相似文献
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Exploring the relationships between perceived neighborhood boundaries and street network orientation
The neighborhood is a core unit of analysis in urban research, planning, and policy-making. However, perceptual and historical processes oftentimes result in neighborhoods that are not tied to sub-urban jurisdictions. For instance, historic neighborhoods might lack official spatial definitions, hampering neighborhood-based tasks in local offices. In this case, urban practitioners can benefit from readily available spatial proxies, such as the local street network. In this study, we conducted an exploratory analysis that combines neighborhood mapping and street network modeling. By retrieving participants' sketched boundaries and quantifying spatial orientations of sketched polygons and local network patterns, we were able to measure and compare the relationships between the urban fabric and the perceived extents of two historic neighborhoods in Lisbon, Portugal. The results provided insights for enhancing existing definitions of non-official neighborhoods, outlining new urban districts as well as for discussions about the role of the urban form in shaping people's perceptions. 相似文献
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《测量平差》的教学原则及其实践 总被引:1,自引:0,他引:1
根据《测量平差》课程的特点,本文归纳了在该课程教学中应遵循的5个教学原则,阐述了各教学原则的定义,要求,具体实施方法和体会,通过对我校四届测量工程专业四年制本科《测量平差》课程的教学实践证明,效果较好。 相似文献
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