Research And Development Of Electronic Map Based On The Flash Of The Network

Electronic map becomes more and more popular in people's lives. Now we see a wide variety of electronic maps, three-dimensional dynamic maps, traffic navigation maps, multimedia maps, internet maps, and the development environment varies. These products are achieved in the professional WebGIS software platform. Due to the general high cost of GIS software platform, system development is difficult, but also with other software can not be universal, not conducive to the secondary development, these defects greatly limit the development of WebGIS. Flash is used to display and transform Vector graph. Although so far not yet issue WebGIS products which are based on flash technology, but as a result of its advantage of vector characteristic and network application Essence, it can very good satisfy GIS regarding the spatial data graphical display request. At present, in the situation which further enhances to the WebGIS browser manifestation request, the research and exploration how to use the flash technology to construct WebGIS Platform system structure and the realization technology with the extension, the probability and the interaction technical characteristic has the vital significance, resolve the problem of space information resources sharing and expression, then on the basis of the research, the development of the advanced WebGIS application is study focus of the essay.Now the WebGIS architecture of the existing mature,this article mainly analyzes how to apply Flash with WebGIS realization technology, using Flash to be WebGIS client,realizing space information visible, mass geography data access and transmission communication technology, summaries and analyzes the realization technology of these functions based to flash. The Flash has some excellent features, such as strong expression and flow control interface, and most of the browsers are able to support the Adobe Flash Player. Then a Flash-based Web map developed in practice. Flash is cheaper than other GIS software platform, ActionScript programming is easy to understand and it greatly reduce the human and material resources. A small amount of data can reduce the network load. To a certain extent, this can promote the application of the electronic maps.According to the general principles of designing, the author raised the model of electronic map of the campus for Lanzhou Jiaotong University. In the Flash development, we used the scripting language of the Action Script to realize some of the basic functions of electronic map:zoom in, zoom, roam and so on. Through the language of XML, it's easy to realize the location query, this article supports the fuzzy query names, eg. to search for the the classroom building, dormitory, library, gymnasium and other internal surface features of the query targeting on campus. According to the comparison of the shortest path algorithm of the Dijkstra and Floyd, the author found the advantages of the Floyd over the Dijkstra and finally selected the Floyd algorithm for the shortest path query for two predefined sites. Finally, this stresses some concluding remarks, and the research content in the near future is put forward.