随着空间数据获取能力的飞速发展，分布式存储管理的空间数据库将成为网络GIS的主要数据源。
Since distributed spatial database will be the main data source of Internet GIS, we have to cope with the intercommunication between heterogeneous databases and systems.
数据网格是海量数据分布式管理和分析的基础设施，它实现了分布、异构空间数据的统一存储、管理、访问和传输。
Data Grid is the distributed management of large-scale data and the infrastructure analysis; it has implemented uniform storage, management, access and transmission of distributed, heterogeneous data.
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