Gml Topology Update Method

GML is a coding standard of geography information which is developed by any firms, any platforms with the method of XML encoding. The purpose of GML is providing description standard of public objects on modeling, transmission, storage and distribution. GML has a good data format, can be widely used in data exchange, data integration, data storage, data dissemination and other areas. GML data model is relatively common, with a fusion vector model, grid model in one and into spatial data, attribute data in one of the advantages. Based on this consideration, there are some experts began to try to use GML data format for the source data to construct a new research GIS software platform to address the differences between the data model for data sharing and interoperability impact.According to the current study, GML-GIS System software, still in the theoretical system improvement and system architecture design, the specific function of system is far from perfect, especially the core functions of GIS - Spatial analysis also far from practical application Needs. The main reason is that the theory of systems far from perfect, especially the GML topology of research is still a blind spot. To some extent, the description of topological relations of spatial analysis has a very important role and significance, it reduces the computational complexity of spatial analysis to assist in the realization of spatial analysis.In this paper, GML topology as a starting point, combined with GML data update, and the two GML technology research merger of the two blind spots, using the existing ArcObjects Technology ,using MapControl Control as a development platform for visual editing environment, LINQ to XML technology with GML data processing, and topology editor updated the way results are reflected in the node, the realization of GML topology updates. This paper focuses on the subject mainly to do the following work:(1) Analyzed the structure of GML, the core data model, compared to the traditional data model and GML data model, the difference between the data model summarized the advantages of GML, GML and related technologies were introduced, and summarizes the current There GML technology progress and deficiencies.(2) the topological analysis of the traditional GIS organization, implementation, based on the topology of GML encoded data organization for analysis and topology, obtained by comparing the two topological organization of the similarities and differences.(3) of the GML topology update some of the technical problems of analysis, such as data analysis, data editing, documentation updated technology, a visual component-based technology solutions, using LINQ to XML technology GML topology document Updated design ideas.(4) designed a prototype system GML topology update, tentatively visual editing environment through a change in topology in the GML document and update the technology through the nodes of the source GML document updates.