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基于地理要素编码的数字地形图入库方法实现及应用 总被引：1，自引：0，他引：1
目前建设城市基础地理信息系统的主要数据来源是各城市已经采集的不同比例尺的数字化地形图,而数字化地形图不能直接被GIS软件操作。本研究从实际出发,提出基于地理要素编码的数字地形图入库设计方法,将ArcGIS Engine和Objects Arx2007相结合进行嵌入式二次开发,利用C#,在.NET2005平台下得以实现,并在某城市的基础地理信息系统建设中得到实际应用。 相似文献
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城市地形图数据库是城市地理信息系统的基础数据库,本文简要地介绍了MapGIS软件平台的城市地形图数据库建设的整个过程。 相似文献
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前言
数字化地形图的数据是建立地图数据库和地理信息系统的基础和数据源。其数据的可靠、精确与否直接关系到数据库建设和地理信息系统中地理基础信息的精度和可靠性。 相似文献
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城市数字化地形图数据库与基础地理信息系统建设 总被引：1，自引：0，他引：1
李宏伟 《测绘与空间地理信息》2008,31(6)
介绍了梅河口市数字化地形图数据库及基础地理信息系统建设的总体思路、实施包过程和特点. 相似文献
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1∶10 000地形图是天津市城市建设与管理的基础用图,是实现城市信息化管理的重要基础地理信息之一,同时也是各行各业建立地理信息系统的基础。本文介绍了天津市1∶10 000地形图数据更新的检验要求和方法,同时指出了下一步检验工作需努力的方向。 相似文献
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大比例尺地形图作为城市基础地理信息系统主要的空间基础数据,在城市规划管理、交通、公众服务等众多领域都有着十分重要的作用。本文将结合目前大比例尺地形图的需求,总结现有地形图的更新技术方法,提出科学合理的快速更新方法。 相似文献
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北京市城市基本比例尺地形图的更新模式 总被引：1，自引：1，他引：0
基础测绘是国民经济和社会发展的一项基础性和公益性事业,广泛服务于经济建设、社会发展、国防建设和人们生活的各个领域.而基本比例尺地形图是基础测绘产品的重要组成部分.北京的城市信息化建设需要大量现势性强的基础地理信息数据.基本比例尺地形图的动态更新与维护是保证基础地理信息系统具有现势性和时态完整性的基础性、前提性工作,它不... 相似文献
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《The Cartographic journal》2013,50(2):129-135
AbstractProvincial Atlas of People's Republic of China (Chung hua ien min kung wo kuo fên shêng di t'u chi). 190 x 265 mm. pp. 251 (84 pages of maps). Peking: Map Publishing Society (di t'u ch'u p'an shê), China, Oct., 1974. 6.30 Yuan 相似文献
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Comprehensive, reliable and uptodate information on natural resources is a pre-requsite for undertaking planned development activities. A knowledge of the present potential resources is esential for formulating and executing effective management strategies for their proper utilisation as the resources are inter dependent and not inexhaustible. Geological and gemorphological mapping are the basic tools not only for search of minerals but also in geotechnical investigations and geologic hazards mapping etc. Romote sensing technique is best suited for inaccessible and hostile terrain study. It ranks very high among others due to its inbuilt and inherent capability of large area coverage and speed for exploring resources and contents within the earth. It suitably overcomes the drawback of uneconomical conventional surveying method and also the handicap of satellite imagery its lack of resolution and stereoscopy. In the present work, an attempt has been made to study an area covering 14.35 sq Km with a view to evolve its geological, geomorphic expressions and explore resource potential by using aerial photographic interpretations. There is plenty of scope to develop photo interpretation technique as a rapid method in exploitation of resource potential and its management. 相似文献
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GPS基线解算的理论与预算法及其在变形监测中的应用研究 总被引：1，自引：0，他引：1
本论文研究的主要内容是GPS基线数据处理的理论、算法及其在变形监测方面的应用,特别侧重于GPS静、动态基线的快速、可靠解算方法的研究,主要的研究内容及结论如下: 1.系统地分析和讨论了GPS基线解算的观测方程,分析了观测方程的多余观测数、秩亏及参数的可估性问题,给出了当观测时间短时近似秩亏问题解决的有关措施. 2.系统地分析和讨论了GPS数据处理的质量控制问题,详细讨论了GPS数据处理时系统的可靠性及衡量可靠性的重要指标一最小可探测偏差(MDB),对常用的一些GPS基线模型的MDB进行了详细的分析和讨论. 相似文献
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卫星频间钟差偏差（Inter-Frequency Clock Bias, IFCB）变化特性的分析对其模型化、卫星钟稳定性的评估具有重要的意义。采用北斗(COMPASS) 2012年1月的三频数据,解算了GEO卫星的IFCB并分析了其时序特性。为了削弱粗差对解算结果的影响,采用了抗差估计算法。针对GEO卫星IFCB的特性,提出了GEO卫星IFCB的经验模型。结果表明,二次曲线函数能较好的描述GEO卫星的IFCB,并达到71%以上的改正效果。 相似文献
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Characterizing and quantifying distributions of shrubland ecosystem components is one of the major challenges for monitoring shrubland vegetation cover change across the United States. A new approach has been developed to quantify shrubland components as fractional products within National Land Cover Database (NLCD). This approach uses remote sensing data and regression tree models to estimate the fractional cover of shrubland ecosystem components. The approach consists of three major steps: field data collection, high resolution estimates of shrubland ecosystem components using WorldView-2 imagery, and coarse resolution estimates of these components across larger areas using Landsat imagery. This research seeks to explore this method to quantify shrubland ecosystem components as continuous fields in regions that contain wide-ranging shrubland ecosystems. Fractional cover of four shrubland ecosystem components, including bare ground, herbaceous, litter, and shrub, as well as shrub heights, were delineated in three ecological regions in Arizona, Florida, and Texas. Results show that estimates for most components have relatively small normalized root mean square errors and significant correlations with validation data in both Arizona and Texas. The distribution patterns of shrub height also show relatively high accuracies in these two areas. The fractional cover estimates of shrubland components, except for litter, are not well represented in the Florida site. The research results suggest that this method provides good potential to effectively characterize shrubland ecosystem conditions over perennial shrubland although it is less effective in transitional shrubland. The fractional cover of shrub components as continuous elements could offer valuable information to quantify biomass and help improve thematic land cover classification in arid and semiarid areas. 相似文献
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Using a multidisciplinary project studying surging glaciers in Svalbard as a reference, this paper examines some of the ways in which photogrammetry can be used as a research tool by glaciologists. Photogrammetric compilations of two of the glaciers under study were produced from 1990 aerial photography. Photogrammetry was regarded primarily as a source of digital elevation models in this project, rather than as a cartographic tool. Problems encountered in applying photogrammetry to the arctic terrain are considered and a methodology devised to ameliorate these problems by maximizing the available data is described. The results of the photogrammetric work are presented and difficulties in quantifying the accuracy of the photogrammetric data are examined. Examples of the ways in which the photogrammetrically derived digital data have been used for glaciological analysis and visualization are discussed. 相似文献
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The quality and integrity of spatial data is very important to support interoperability among different systems. To reach this aim integrity rules defined by the application play an important role (for example, constraints between object classes). In this article, we propose a methodology to define integrity constraints using user level spatial relations between classes of individuals. We will also provide mapping rules from user level relations to geometric level operators to allow the computation of relations. As a case study, we will define the constraints for the class of rivers and some of its specializations. 相似文献