共查询到20条相似文献，搜索用时 62 毫秒
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主要介绍利用Microsoft Visual Basic.NET编写的地形图分幅编号查询与面积计算程序。通过该程序,根据经纬度坐标或高斯坐标,可查询该点所在各种基本比例尺下的图幅编号、西南图廓点的经纬度坐标以及在不同坐标系下的图幅面积。 相似文献
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地形图图幅编号的自动查询与检索 总被引：9，自引：2，他引：7
通过编写程序,可对地形图图幅编号进行自动查询与检索。若给出某点的经纬度坐标,可自动查询该点所在的指定比例尺图幅编号,若给出某区的经纬度坐标范围,可自动检索该区指定比例尺所有图幅编号。 相似文献
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利用国家基本比例尺地形图图号与图角坐标的数学关系,基于Visual Basic语言,编写了根据1∶1万比例尺地形图图号查询图角坐标的程序,为快速准确地查询1∶1万地形图图角坐标提供了高效、快捷的方法。 相似文献
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提出将坐标、经纬度、图幅号作为查询基础地形图库的基本元素,把图幅号与经纬度的互算作为实现图幅号关联查询的关键。 相似文献
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北京市大比例尺地形图图幅号查询信息系统的研制 总被引：2，自引：0，他引：2
供应大比例尺地形图是城市测绘资料管理部门的基本职能。文中论述了在ARC／INFO基础上,以1：25000比例尺地形图上的点、线、面地物为索引,查询北京市1：500～1：10000各类比例尺地形图图幅号的算法。实验表明系统是实用的。 相似文献
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基于斜率内插算法的地形图图幅查询系统设计与实现 总被引：2，自引：1，他引：1
为查询地形图上指定区域各种比例尺下的地形图图幅编号,提出一种基于斜率内插的算法,能批量查询且仅输出该区域所属地形图图幅编号,该方法基于VB 6.0实现。 相似文献
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刘君臣 《测绘与空间地理信息》2014,(7):164-166
省级测绘档案资料馆馆藏了该省内各市、县的1∶500,1∶1 000等大比例尺地形图数据,这些数据大多采用地方坐标系。由于城市大比例尺数据的空间参考多为地方坐标系,使得对大比例尺数据进行统一查询、统计、定位难以实现。本文提出由地方坐标系地形图数据的图幅号生成相应的结合表,并将其转换到国家坐标系,将国家坐标系下的大比例尺结合表叠加到国家基本比例尺地形图数据中,可快速查询、定位到需要的城市大比例尺数据。 相似文献
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介绍了不同比例尺下地形图的分幅和编号规则,根据规则要求,在Microsoft visual studio环境中,采用Fortran语言,实现了对中国境内不同比例尺下地形图分幅中心点坐标的计算.结果表明,程序简洁明快,计算正确,具有一定的实用价值. 相似文献
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《制图学和地理信息科学》2013,40(2):87-103
Mapping spatial change is a fundamental theme in geography. The analytical and numerical application of differential calculus to continuous geographic data produces first-derivative distributions that can be mapped to show gradient magnitude and gradient direction, and second-derivative measures that can be mapped to show the form (convexity, concavity) of the geographic surface. When these differential measures are obtained for spatially distributed temporal data, a velocity/acceleration change map can be constructed. Cartographic applications of the methodology presented in this paper include slope and curvature landform mapping, derivative trend-surface mapping of urban housing value gradients and the velocity/acceleration mapping of mobile-home residency in the United States from 1950 to 1980. 相似文献
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绘制工程线路的平、断面图,用Excel（电子表格）和AutoCAD绘图软件配合进行数据处理和绘图的方式方法最为简单和快捷,本文对此法进行了详细介绍和举例。 相似文献
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为了直观、真实地展示输电线路及各类灾害的影响,以某区域高压输电线路为例,详细论述了如何基于其他来源的基础地理数据、野外采集的输电线路GPS点位数据及各类灾害图件,制作高压输电线路专题地图与灾害专题图。结果显示,基于GIS的电力行业专题地图与灾害专题图不仅表达直观、查询方便、易于保存和更新,而且便于管理人员进行分析与决策。 相似文献
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《制图学和地理信息科学》2013,40(3):232-248
Successful implementation of an intelligent system for automated map generalization requires formalization of cartographic principles that are, in many cases, only intuitively understood. Formalizing these principles requires acquisition and re-expression in the form of semantic nets, frames, production rules, or similar formalization methods. The various techniques for cartographic knowledge acquisition have been discussed on a theoretical basis; however, little empirical research has been conducted. This paper reports on empirical acquisition of cartographic knowledge by reverse engineering; that is, on trying to recapitulate decisions made on published documents or maps. The work is based on a computer-assisted multi-scale inventory of the Austrian National Topographic Map Series. Queries of the relational database, within which inventory data are stored, lead to the formulation of prototype production rules for modifying map symbols during automatic scale changes. Components of map generalization expressed in such rules include the selection behavior of settlement, transportation, and hydrographic objects, and the degree of simplification of settlement domains and building clusters. The acquired cartographic knowledge reveals quantitative relations between map elements and the changes in these relations that occur with scale transition. These insights can guide subsequent knowledge refinement using other acquisition methods. This paper provides, in addition, a conceptual framework by which other topographic map series may be compared at multiple scales. 相似文献
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AbstractThis paper describes some results of an attempt to design and to write a general purpose computer program which can be used to produce quality maps of discrete data by the person who has had no training in computer programming. In the first section, the variety of the maps this program can produce is illustrated; in the second section, some of the principles involved in such map production are discussed; in the third section, the input arrangements for using the program are described and, finally, the role of such programs in teaching and research in the years ahead is discussed. 相似文献
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《The Cartographic journal》2013,50(2):77-80
AbstractMaps play an important part in planning at national, regional and local levels. This role should increase ill the future as greater use is made of computers.This paper was presented to the annual Symposium of the Society in September 1970, at the University of Bristol. 相似文献