基于OGSA-DAI扩展的空间数据访问和集成

针对分布式地理空间信息共享、资源管理和空间分析的需求，结合网格技术的特点，研究基于网格的分布式多源异构地理空间信息查询处理集成的关键技术，提出了基于EDIF框架改进的集成框架。利用OGSA—DAI的扩展机制引入了对分布式空间数据的拓扑分析和互操作支持；使用JDBC Driver for OGSA—DAI组件实现数据资源访问。最后实现了一个分布式地理空间信息集成访问和操作原型系统，并通过实验对系统进行了测试和验证，能为用户提供统一的服务访问接口。

Access and Integration of Geospatial Data Based on OGSA-DAI Extension

Aiming at the demand of data sharing,resource management and spatial analysis of distributed geographic information,put forward a new method of integration framework based on EDIF improve on frame,through combining the characteristics of grid computing,studies on the key technology of distributed multi-resource heterogeneous geographic information based on grid computing.By taking advantage of the extension mechanism of OGSA-DAI,a new approach to topological analysis and special interoperation is presented.JDBC Driver for OGSA-DAI is used to implement the access to the data resource.Finally a distributed heterogeneous GIS integration and interoperation prototype is implemented.The prototype is able to provide a uniform service-based interface for users,and is validated by experiments.