The Expression Of Cadastral Spatial And Temporal Data And Aplication Based On GML

The sharing and interoperability of geographic data in the network environment has been one of the main development directions of the Geographic Information System. GML promotes the development of this study. In this paper, on the basis of using GML to express spatial topology and temporal topology and the theory of space-time topology, combined with the theory of parcel changing and how to express spatial with GML. How to use GML to express the changes when parcel was changing was studied. An experiment was carried out about the way to code the space-time topology in parcel changing and a method was proposed. Then a cadastral data management application schema based on GML core schemas was created.Then, all currently available XML documents analytical technology were compared, and VTD-XML was chosen to parser GML document in this paper. Although VTD-XML as XML document parser is very good, but it still can not meet all the requirements for GML, it is failed to provide a good analytical way for larger files of GML document, but for now, this is a kind and effective XML parser. Also the GML data files storage method was studied, and now the existing GML data management in the mainstream database management for the entire document, and this way can not reflect the characteristics of GML file, when to query in GML some code methods was needed. This paper introduces a kind of native XML database-BaseX to store GML files. This database fully supports XML, and support the construction of the database data, Xquery, XPath, support the level of data display, as management GML document database software is very effective.At the same time, considering the defects of the ground state correction model, using GML built a base state with amendments to improve the model to a certain extent. Finally, an application was completed to realize GML data visualization and the simple query of GML data. Facts prove that, GML was used for data storage is very effective, the key is how to be used effectively and rationally and how to manage GML data files effectively and rationally.