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A Sensor Web registry acts as a broker in a service‐oriented environment to publish and discover Sensor Web resources (e.g. sensors, sensor services, observations, and alerts). The Catalogue Service for the Web (CSW) developed by the Open Geospatial Consortium (OGC) defines a standard interface and protocol for publishing and discovering geospatial resources. This article adopts the CSW for the development of a Sensor Web registry. Metadata for Sensor Web resources are registered into the catalogue information model – the ebXML Registry Information Model (ebRIM). In the Sensor Web environment, sensor observations can be available in real‐time or near‐real‐time, and thus metadata registered in CSW need to be updated frequently. This article proposes an incremental harvesting approach, which can harvest the updated metadata efficiently. A prototypical implementation is provided to demonstrate the applicability of the approach. 相似文献
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利用原有平台进行城市基础地理空间勘测数据共享时,元数据数量过大,无法对元数据进行管理,请求次数在160次以内数据服务响应时间较长,因此需要设计一种新的城市基础地理空间勘测数据共享平台.该平台共由八个模块构成,包括服务器模块、基础地理空间勘测数据管理模块、基础地理空间勘测数据处理模块、网络服务模块、地图操作模块、元数据管... 相似文献
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基于SMCS的多源空间数据集成应用 总被引：1，自引：0，他引：1
为解决多源空间数据特别是不同参考基准数据实时集成困难的问题,通过分析空间元数据间关系,定义并利用元数据知识来实现空间元数据的动态聚合和目录服务SMCS的构建。实验结果表明顾及空间关系的SMCS提高了对空间信息的动态获取、处理和发布的能力和效率,为网格环境下多源数据的高效集成应用服务提供技术支持。 相似文献
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SIG中的元数据共享服务体系研究与实践 总被引：1，自引：0，他引：1
元数据是数字地球建设的关键技术之一，是建设信息化城市和实施空间信息网格基础设施的重要内容。本文基于Web服务对象及其标准，建立了分布、异构的网格环境下的元数据服务管理模型，包括基于Web服务的空间元数据共享服务体系、空间元数据服务与发布流程及其实现。最后，探讨了如何使用目前JAVA技术中比较流行的JDBC和懒加载技术开发空间元数据服务管理模型。 相似文献
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《International Journal of Digital Earth》2013,6(3):175-193
The hypermap concept was introduced in 1992 as a way to hyperlink geospatial features to text, multimedia or other geospatial features. Since then, the concept has been used in several applications, although it has been found to have some limitations. On the other hand, Spatial Data Infrastructures (SDIs) adopt diverse and heterogeneous service oriented architectures (SOAs). They are developed by different standard bodies and are generally disconnected from mass market web solutions. This work expands the hypermap concept to overcome its limitations and harmonise it with geospatial resource oriented architecture (ROA), connecting it to the semantic web and generalising it to the World Wide Hypermap (WWH) as a tool for building a single ‘Digital Earth’. Global identifiers, dynamic links, link purposes and resource management capabilities are introduced as a solution that orchestrates data, metadata and data access services in a homogeneous way. This is achieved by providing a set of rules using the current Internet paradigm formalised in the REpresentational State Transfer (REST) architecture and combining it with existing Open Geospatial Consortium (OGC) and International Organization for Standardization (ISO) standards. A reference implementation is also presented and the strategies needed to implement the WWH, which mainly consist in a set of additions to current Geographic Information System (GIS) products and a RESTful server that mediates between the Internet and the local GIS applications. 相似文献
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地理信息系统集成平台框架结构研究 总被引：51，自引：3，他引：48
提出了基于客户／服务器结构的地理信息系统集成平台总体结构,探讨了基于元数据的地理信息系统数据集成平台以建立物理上分布而逻辑上集中的分布式地理信息系统数据库,提出了应用符合３ＮＦ范式的关系数据库进行模型管理的模式,在此基础上探讨了地理信息系统可视化建模工具。 相似文献
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一种基于位置的移动服务系统的设计与实现 总被引：2，自引：0，他引：2
基于位置的移动服务需要设计高效、稳定和可扩展的体系结构与开发方式，提出了一种基于Web服务的LBS体系结构（WS-LBS），并设计了WS-LBS系统框架，实现了空间信息服务的构建与发布机制，扩展了终端用户，实现了一个WS-LBS原型系统。 相似文献
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《The Cartographic journal》2013,50(4):246-260
AbstractThe design and development of a highly interactive web-based, GIS-enabled atlas is reported. The atlas is a prototype, designed as a model for implementation of atlases to support government cancer-control activities. This model integrates symbolisation and design principles from print cartography, interaction strategies from exploratory geovisualisation, and web-map/web-feature service advances from GIS. The atlas has been implemented using a client-server architecture. It makes use of two open-source GIS tools, PostGIS (as the system database) and GeoServer (to connect the database to the client mapping application). The client mapping application has been built in Macromedia Flash. The entire client-server architecture is described, then direct primary emphasis is focused on the client mapping application. For this component of the system, the interface design strategy is detailed, the approach taken to implement this strategy in Flash is documented, and the mechanisms developed to build dynamic links from the client to the underlying database through the server are outlined. Features of the atlas are presented through a prototypical use scenario for a target user. 相似文献
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GIS网格体系结构探讨 总被引：21，自引：3，他引：18
于雷易 《武汉大学学报(信息科学版)》2004,29(2):153-156
就当前WebGIS发展中的空间资源共享问题,结合新兴的网格技术,从网格的角度提出了包括基础网格、空间数据网格、空间信息网格(狭义)、空间知识网格和空间服务网格在内的GIS网格体系,以期改善Internet上空间资源共享的环境。 相似文献
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土地资源遥感监测信息服务系统关键技术研究 总被引：1，自引：0，他引：1
本文从土地遥感监测信息的特点入手,研究了土地遥感监测信息服务系统的构建技术。在后台数据组织方面,针对土地遥感监测信息包含多种类型和相互关联的数据源,提出了基于元数据机制的遥感监测信息组织体系;在应用部署上,通过空间数据库引擎和地图网络服务引擎实现后台对空间数据的调用和处理;在客户端功能开发上,实现了基于WebGIS的土地遥感监测信息综合应用与服务。 相似文献
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《International Journal of Digital Earth》2013,6(10):811-828
The open service network for marine environmental data (NETMAR) project uses semantic web technologies in its pilot system which aims to allow users to search, download and integrate satellite, in situ and model data from open ocean and coastal areas. The semantic web is an extension of the fundamental ideas of the World Wide Web, building a web of data through annotation of metadata and data with hyperlinked resources. Within the framework of the NETMAR project, an interconnected semantic web resource was developed to aid in data and web service discovery and to validate Open Geospatial Consortium Web Processing Service orchestration. A second semantic resource was developed to support interoperability of coastal web atlases across jurisdictional boundaries. This paper outlines the approach taken to producing the resource registry used within the NETMAR project and demonstrates the use of these semantic resources to support user interactions with systems. Such interconnected semantic resources allow the increased ability to share and disseminate data through the facilitation of interoperability between data providers. The formal representation of geospatial knowledge to advance geospatial interoperability is a growing research area. Tools and methods such as those outlined in this paper have the potential to support these efforts. 相似文献