Incremental Updating Of Polling Terminal Gas Pipe Network Data Based On Topological Relations

The gas pipe network information system is an important part of digital cities construction, the gas pipe network data updating is the core of gas pipeline network database construction. The gas network data updating includes not only information center gas pipeline network database, but also the mobile terminal gas pipe network data. For inspection person inspect by area, mobile terminal just store personal gas pipe network data in order to improve the confidentiality of the data and reduce the mobile terminal storage. It only need to download the incremental information of corresponding region when updating data. Because of the importance of topological consistency, the paper research and achieve the mobile inspection terminal data updating based on the topological relations. The main works in this thesis are summarized as follows:(1)The author analyzed the topological relations between the pipe network elements, and summed up the five topological relation types between pipelines and three topological relation types between points and pipelines. It analyzed the existing topology model in the pipeline data applicability, the author selected based on the node and Euler number topology model to judge the topological relationship of gas pipe network elements.(2) The author analyzed the characteristics of the gas network elements. According to the topological consistency requirements, the paper summed up five updating rules between points and pipelines and seven updating rules between pipelines.(3) Using C#programming language, the thesis developed prototype system based on the topological relationship in Microsoft Visual Studio2008environment and the Windows CE platform. The paper achieved to display data, read incremental informations and update data by using gas pipeline network data of Haidian Island. It vertified the method correctness and feasibility.