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地理元数据技术系统的设计与实现 总被引:2,自引:0,他引:2
介绍了地理元数据的概念、类型、标准与应用模式,以吉林省农业信息网元数据系统为例,探讨了元数据技术系统的实现方法,并提出地理元数据库设计、元数据登录系统、检查系统和查询系统等关键技术问题的解决方案。 相似文献
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地理元数据技术系统的设计与实现 总被引:30,自引:0,他引:30
介绍了地理元数据的概念,类型,标准与应用模式 ,以吉林省农业信息元数据系统为例,探讨了元数据技术系统的实现方法,并提出地理元数据库设计,元数据登录系统,检查系统和系统等关键技术问题的解决方案。 相似文献
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基于JSP的空间元数据发布系统的设计与实现 总被引:3,自引:0,他引:3
首先介绍元数据、地理空间元数据和空间元数据发布系统的相关概念,并讨论在互联网时代元数据发布系统研究的必要性;其次论述发布系统的实现技术、体系结构及其运行流程;最后在JSP环境中实现了一个基于水利地理空间元数据标准的空间元数据发布系统. 相似文献
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基于元数据管理的环境地理信息系统充分运用元数据管理理论进行系统开发,建立开放式的系统架构,形成了环境地理信息系统综合运用平台框架.该系统把元数据作为系统的核心数据内容,其最重要的技术特点是通过对元数据的自定义来实现数据的扩展性. 相似文献
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基于XML的元数据服务(目录服务)是测绘成果分发服务系统项目建设中的一个重要内容。对《基础地理信息数字产品元数据》和《测绘成果网络分发服务系统建设技术指南》中的2种元数据进行比较分析,提出这2种元数据快速批量转换的设计思路,并编制程序实现基于XML的地理信息网络分发服务元数据的批量转换,提高了工作效率和元数据质量,应用效果较好。 相似文献
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本文通过市政综合管线GIS系统开发,提出一种基于COM组件技术在GIS应用系统中元数据的组织方案,可动态抽取元数据信息,以及使元数据记录可以作为GIS的快速启动模版,并且利用XML实现GIS元数据的实时浏览和交换输出的动态管理,提高了地理元数据的灵活性和使用价值。 相似文献
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基于XML Schema地球系统科学数据的元数据扩展机制 总被引:5,自引:0,他引:5
概述目前国内外地学数据共享中元数据的应用,分析地球系统科学数据的学科特点:数据量大、学科复杂、元数据标准多,从而论证在地球系统科学数据共享网的开发和研究中元数据扩展的必要性,论述元数据扩展的基本方法、抽象模型和基本原则,总结地球系统科学数据共享网核心元数据的多学科扩展表达,最后,论述地球系统科学数据共享网中元数据扩展机制的实现,以及利用XML Schema文档的可扩展性,阐述基于XML Schema地球系统科学数据的元数据扩展机制,实现地球系统科学数据元数据的多学科扩展. 相似文献
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本文成功地在已有的数字化测绘生产管理流程上引入了基础地理数据元数据,使元数据和测绘生产过程紧密结合、互为补充。实现了在测绘生产流程中更新元数据,通过元数据管理测绘生产流程。按照这个理论构建了元数据管理与服务系统在上海市测绘院得到很好的应用。 相似文献
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The Z/I Imaging Digital Camera System 总被引:1,自引:0,他引:1
Market needs for airborne and spaceborne imagery used in photogrammetry and GIS applications are changing. Fundamental changes in sensors, platforms and applications are currently taking place. Most recently, new high resolution spaceborne sensors have become available. Besides classical photogrammetry, new thematic applications will drive the future image market. Savings in cost and time, together with the need for higher and reproducible radiometric resolution or spectral information will push forward the change from analogue to digital imagery. High resolution satellites will compete with airborne film-based photography and digital camera systems.
With the availability of a digital airborne camera, it is possible to completely close the digital chain from image acquisition to exploitation and data distribution. The key decision regarding the camera design in this case is whether a linear or area array sensor should be used. In view of the high geometric accuracy requirements in photogrammetry, Z/I Imaging has focused development on a digital camera based on an area sensor. An essential aspect of this decision was not only the aerial camera system, but also the entire photogrammetric process to the finished photographic or mapping product. If this point of view is adopted, it becomes clear that the development of a digital camera involves more than simply exchanging film for silicon. Aspects such as data transfer rates, in-flight data processing and storage, image archiving, georeferencing, colour fusion, calibration and preprocessing have the same influence on the economic assessment of a digital camera system. This paper describes current development activities and application aspects of a digital modular airborne camera system. 相似文献
With the availability of a digital airborne camera, it is possible to completely close the digital chain from image acquisition to exploitation and data distribution. The key decision regarding the camera design in this case is whether a linear or area array sensor should be used. In view of the high geometric accuracy requirements in photogrammetry, Z/I Imaging has focused development on a digital camera based on an area sensor. An essential aspect of this decision was not only the aerial camera system, but also the entire photogrammetric process to the finished photographic or mapping product. If this point of view is adopted, it becomes clear that the development of a digital camera involves more than simply exchanging film for silicon. Aspects such as data transfer rates, in-flight data processing and storage, image archiving, georeferencing, colour fusion, calibration and preprocessing have the same influence on the economic assessment of a digital camera system. This paper describes current development activities and application aspects of a digital modular airborne camera system. 相似文献
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LIANG Yong LU Xiushan ZHANG Degui LIANG Fu 《地球空间信息科学学报》2002,5(1):68-73
This paper deals with the content,purpose and significance of digital agriculture,and gives a brief introduction to digital earth,digital China and digital agriculture abroad.The main content of digital agriculture includes the construction of database,Metadata standard,monitoring system,forecasting and decision-making system,information-releasing system.The main technical supports of digital agriculture are 3S technology,Metadata management technology,fast-handling technology of remote sensing,the technology of computer wide-band network and virtual reality,intelligent agriculture machinery and field real-time information collecting technology.The advantages of implementing digital agriculture in China and the problems worthy of attention are pointed out as well. 相似文献
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简要回顾了地下管线管理的进展情况以及3S技术在地下管线管理中的应用.在阐述了元数据概念、编码语言和结构的基础上,对国内外地理信息元数据的研究进展情况进行了初步的分析.结合葫芦岛市地下管线信息系统建设的实践,对地下管线信息系统元数据的特征、内容进行了探讨,并对其元数据进行了设计与实施. 相似文献
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