Research And Implement Of Geoscience Spatial Data Management System Based On Metadata Standard

With the nation raised “on the basis of data and technical supporting system for information construction of Geological Survey” in the digital land project implementation process, all the relevant areas, sectors or experts intensively start collecting and storing a lot of spatial data and doing informationization. But without interconnection, interoperability and sharing, they just build the independent spatial data management system based on their own demands, which is similar to the other industries, the “islands of information” phenomenon being formed and causing a huge waste of resources. How to share all these Geosciences data is currently inescapable problem, which should be solved.The main reason for this phenomenon is because when the related areas, departments or experts collect data, they all formulate the data format, attributes, data content based on their each practical need, which meaning the information of collecting data exists differences more or less. So, the above situation makes it exists conflict in doing data exchange.For this reason, by analysis the development of metadata standards of spatial data as the point cut, this paper studies on the spatial data characteristics; apply scope and status at first. Then depending on the situation of current metadata standards at home and abroad, the system will adopt the internal 《The Geological Information Metadata Standards》(Version 2006) as the reference standards, develop the extended metadata content, which implementing the integration management of Metadata-Spatial Data-Project Information; then, by studying on the current four major spatial data storage mode and contrast each advantages and disadvantages, eventually, this system adopts the mainstream storage mode: the full relational database management storage mode. Combined with the Single Machine Multi SDE technology, the system can centralized manages the multi-source spatial data in logically, which actually separated in physically; finally, the system uses the Active Directory Based Role Access Control Model-ADBRAC as the security control mode. It manages the roles and permissions of users in the form of the domain Active Directory, and eventually establishes the B/S Geosciences Spatial Data Management System Based on Metadata Standards. The system implements by using C# language and the secondary development interface of ArcGIS in.NET Framework. And the back-end database is Oracle 10 g. The ultimate realization function modules include: data management module and the system management module. The data management module can implement the management(editing and deleting) on multi-source spatial database, the spatial data in each spatial database and metadata, and can also implement querying data with the metadata; the system management module is manly to manage the system’s users and permissions. The users in the system mainly from the domain Active Directory, whose permissions are including the spatial database’s action permission, spatial data’s action permission, project information’s action permission and other various rights.The paper finally discusses the system’s research achievements and shortcomings, that is, while the system has achieved the effective features for basic spatial data management and the security control features for B/S system users, in order to implement the spatial data’s sharing and supporting for more spatial data’s professional applications, the system still needs to be further optimized.