【作者】 于雷易；

【导师】 边馥苓；

【作者基本信息】 武汉大学 ， 摄影测量与遥感， 2004， 硕士

【摘要】 当前，网格已经成为实现Internet中各种资源有效共享与协同的热点技术。在空间信息科学领域，人们也提出了空间信息网格(Spatial Information Grid，SIG)和Grid GIS的概念，以实现网格环境下各种空间资源的有效共享与协同。 为了细化SIG和Grid GIS的研究，针对当前空间数据共享的迫切需求，本文提出了空间数据网格的概念，将网格技术应用于空间数据共享与应用，以期改善空间数据共享和应用的环境。空间数据网格是网格环境下面向空间数据共享与协同，构造一体化空间数据网格映象的技术体系。 空间数据网格通过元数据目录和数据代理，将网格环境下的目录服务器的元数据目录集成到一起，为客户端提供空间数据的统一的逻辑视图，实现目录服务器的协同；通过监控数据服务器的服务状态，合理调度数据服务资源，并且通过数据代理的数据集成功能将各数据服务器的数据资源集成后提供给客户端，实现了数据服务器的协同。 针对空间数据网格所涉及到的基本概念、支撑技术、体系结构和关键技术等，本文作了以下几个方面的研究工作： 1、论述了空间数据网格技术的研究意义，叙述了网格、数据网格、空间信息网格和空间数据共享等空间数据网格相关技术的研究现状。 SIG是网格技术和空间信息科学融合的产物，空间数据网格是SIG细化研究的结果，空间数据网格的发展有助于改善GIS空间数据共享的环境。当前，SIG的研究还刚刚开始，还没有形成一个统一的框架体系。 2、论述了网格、数据网格、SIG、Grid GIS和空间数据网格的基本概念和基本内容，并讨论了他们与中间件技术、分布计算技术、P2P技术、Web GIS、OpenGIS之间的关系。 Grid GIS是SIG的重要组成部分，而Grid GIS从网格的角度又可以划分为基础网格、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等。Grid GIS是Web GIS在网格环境下的升级，OpenGIS仍然是Grid GIS的重要组成部分。 3、总结了空间数据网格的支撑技术，包括网格技术、Web Service、OpenGIS和P2P等，同时论述了它们在空间数据网格技术中所起的作用。 4、研究和论述了空间数据网格的技术定位、协议架构、组件架构、网络模式、典型的动态行为设计、现有的空间数据共享产品解决方案和空间数据网格的特点。 空间数据网格本身并没有产生新的协议，完全基于现有的W3C、OGSA以及0伴nGIS协议和规范。空间数据网格的组件架构主要包括客户端、目录服务器、数据服务器和CA中心四个部分。其中目录服务器是空间数据网格的核心，主要包括元数据目录和数据代理两个组成部分。 5、基于C\S模式和PZP技术提出了空间数据网格的混合网络模式，改善空间数据网格的可扩展性，以实现空间数据网格目录服务器的协同，为客户端提供空间数据的统一的逻辑视图。 6、研究并设计了空间数据网格元数据目录。元数据目录提供了一个统一的方式来命名、发布和访问空间数据网格涉及到的各种空间数据源，提供数据源信息服务。 7、研究并设计了空间数据网格的数据代理，主要实现空间数据网格的目录集成、数据查询、数据访问和数据集成功能。数据代理通过监控数据服务器的服务状态，合理调度数据服务资源，并且通过数据代理的数据集成功能将各数据服务器的数据资源集成后提供给客户端，实现了数据服务器的协同。 8、探讨了网格空间数据库系统的基本概念、体系结构、数据访问与集成服务。 9、介绍了JavaZ开发平台和网格基础软件Globus Toolldt 3.0，并在JavaZ和GT3的基础上构建了一个空间数据网格的实验系统。实验系统通过GT3的网格服务容器提供了一个GML文件的数据服务，客户端可以获取数据服务的元数据信息和服务数据，并且获取数据服务所提供的GML文件内容。更多还原

【Abstract】 Grid has become a hot issue of research on sharing and cooperating of Internet resource throughout the world now. ’Within the domain of Spatial Information Science, Spatial Information Grid and Grid GIS were proposed to solve the sharing and cooperating of Spatial Resource in the grid environment.The dissertation proposed Spatial Data Grid to improve the status of spatial resource sharing and applicating, because Spatial Information Grid and Grid GIS need to be researched in detail, and sharing of spatial data is in urgent need. Spatial Data Grid is a technology system which aims at spatial data sharing and cooperating and integrates spatial data into a single image of Spatial Data Grid in the grid environment.The metadata catalog and data broker of Spatial Data Grid integrate the metadata catalog of grid to offer an uniform logical view for the client, Thus realize the cooperation of catalog server. They also dispatch the data source correctly by monitoring the service stasus of data server, and integrate the data source of data server for the client by the function of data integrating of data broker. This realizes the cooperation of data server.About the concept, support technology, architecture and key technolyg of Spatial Data Grid, the main work of the dissertation concentrated in the following parts:1. Discussed research value of Spatial Data Grid and research status of Grid, Data Grid, Spatial Data Grid and spatial data sharing, which are the related technologies of Spatial Data Grid. SIG is the product of syncretization of Grid and Spatial Information Science. Spatial Data Grid is for the detailed research of SIG The development of Spatial Data Grid is helpful to improve the status of spatial data sharing. SIG began to be studied a short time ago. And an uniform architecture of SIG is need to be formed now.2. Discussed basic concept and content of Grid, Data Grid, SIG, Grid GIS and Spatial Data Grid. And also the relationship among them with middleware technology, distributed computing, Peer-to-Peer, Web GIS and OpenGIS.Grid GIS is an important part of SIG Grid GIS can be divided into five part in the view of grid, including Basal Grid, Spatial Data Grid, Spatial Information Grid(in narrow sense), Spatial Knowledge Grid and Spatial Service Grid. Grid GIS is the upgrading of Web GIS in grid environment. OpenGIS is still an important part of Grid GIS.3. Summaried the support technology of Spatial Data Grid, including Grid, Web Service, OpenGIS and P2P. The function of them was also discussed.4. Researched on the architecture of Spatial Data Grid, including archor point of technology, protocol architecture, component architecture, network model and typical activity view. The existing resolvent of software for spatial data sharing and the characters of Spatial Data Grid were also discussed.Spatial Data Grid did not produce any new protocol. It was completely based on the protocols and specifications of W3C, OGSA and OpenGIS. The architecture of Spatial Data Grid is composed of client, catalog server, data server and certificate administrator. Catalog server is the core of Spatial Data Grid. It consists of metadata catalog and data broker.5. Proposed a mixed network model based on C/S and P2P. It can improve the expansibility of Spatial Data Grid. And it is used to realize the cooperation of catalog server of Spatial Data Grid. Thus Spatial Data Grid can propose a uniform logical view of all spatial data for clients.6. Researched on the metadata catalog of Spatial Data Grid. The metadata catalog offers an uniform mode to name, publish and access all kinds of data source of Spatial Data Grid.7. Researched on the data broker of Spatial Data Grid. The data broker mainly realizes the function of catalog integrating, data querying, data accessing and data integrating. The data broker dispatch the data source correctly by monitoring the service stasus of data server, and integrate the data source of data server for the client by the function of data integrating of data brok更多还原