| As an important component of Moitoring System, Vehicle Monitoring System has been used widely, but its traditional data presentation method is lack of intuitive and decision-making visualization. Inherited the advantages of Internet and Geographic Information System(GIS), Web GIS can combine geographic location with field states in Monitoring System to give a very strong visual impression of the data presentation and realize decision-making visualization. So it is very essential to applicate Web GIS services in Vehicle Monitoring System.First of all, considering the requirements of the geographic information services in this dissertation, the whole architecture of Web GIS is designed as three-layered structure: Data Management Tier, Geographic Information Services Logic Tier and Data Presentation, and then each tier is studied and analyzed respectively; Spatial data is cut and merged with professional GIS software, and XML data is designed to achieve display of map layers, so loading rate problem because of enormous amount of spatial data is resolved effectively; Open-source spatial database is introduced to manage spatial data and attribute data, and then spatial data is imported into spatial database, at the same time, spatial index is established to accelerate the speed of data query, at final, the problem which complex spatial query and spatial analysis can not be achieved by using file to manage spatial data and attribute data is resolved; Open-source map engine SharpMap is re-designed and re-packaged with ASP.NET Ajax technology to resolve problems of limited functions and poor encapsulation of the original map engine, the way of asynchronous communication is changed and the system's real-time is improved.In the end, geographic information services which are designed and achieved with Web Service technology, database connection technology and object-oriented design ideas according to what you have done above have gained good results in Vehicle Monitoring System. |
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