| The interoperability of spatial data is always a subject field that is paid more attention to. With the development of Middleware and Web Services technology, some problems of GIS interoperability have been solved. However, in the process of the combination between GIS interoperability and land resources management of our nation, some shortcomings and limitations emerge, which restrict the application of GIS interoperability in the field of land management. A new method of GIS interoperability which is suitable for the land resources management of our nation is explored through the interoperability modeling towards land resource entities.First, the deficiencies of resource managing and sharing in traditional land information systems together with the difficulties when combining them are analyzed. Meanwhile, the concept of "resource entity" is put forward according to specific application. Subsequently, the related technology of GIS interoperability is discussed in detail, so is the mechanism of interoperability of land spatial data based on GML. Furthermore, the problem-domain in accordance with the needs of land management is analyzed. According to the analysis above, a solution to achieve GIS interoperability through constructing "virtual central server" is brought forward.On the basis of the analysis above, the model of "virtual central server - sub server" is designed; the organization of resource entity's metadata is discussed later. Moreover, the resource directory for GIS services is established; the Geodatabase XML Schema is used to transfer the geo-constructs efficiently between virtual central server and sub servers.The experiment indicates that the method above can solve the interoperable problem of land data effectively. It also proves that this method is not only in line with the standards of GIS interoperability, but also suitable for specific applications. The outcome of this study will provide useful reference to other fields of GIS interoperability to some extent. |
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