Research And Implementation Of Settlement Information Sharing Platform For Beijing-Shanghai High-Speed Railway Based On B/S Structure

With the development of Web technology, it has become more important to adopt some systems based on Browser/Server structure, which is a change and improvement compared to Client/Server structure. After 2005, Ajax (Asynchronous JavaScript And XML) Technology has became one of the most useful technology which is adopted widely in Web application program, it aims at decreasing redundancy, enhancing user's feeling and upgrading application efficiency when data is delivered via Internet. Because of so many advantages, Internet technology has already been used in many application areas nowadays. At the same time, GIS (Geographical Information System) has also developed not only in application range but also in application threshold. In traditional surveying task, it is valuable to propose a solution about information surveying through integrating dominant position of GIS and Internet.Beijing-Shanghai High-speed Railway lies on eastern coastal areas of China. The length of it is up to 1318 kilometers. Compared to other traditional projects, it has some characters as following:a) The operating speed is as fast as 350km/h, which indicates that the railway track must be very smooth.b) Beijing-Shanghai High-speed Railway passes through the North China Plain and the Yangtze River Delta Plain, where the geological structure is loess and sediment. The subgrade of project is unstable.c) If people cannot detect and find settlement information between adjacent bridge piers during construction process, there will be hidden danger in operating process.d) The project is ballastless track, which means the regulation range is limited than the traditional railway.From the above points, it is able to design and realize the Settlement Information Sharing Platform for Beijing-Shanghai High-speed Railway to distribute and share settlement information quickly. In connection with practical operation of settlement survey in Beijing-Shanghai High-speed Railway, this sharing platform must meet the needs of information management and protection of datum point, monitor point and small section.This thesis studied the development and trend of GIS, revealed the application prospect of Web GIS first and then discussed the realization approach about Browser/Server structure and Web GIS. Based on what has been mentioned above, this thesis has proposed a solution to Settlement Information Sharing Platform for Beijing-Shanghai High-speed Railway based on Ajax structure, which adopts Beijing-Shanghai high-speed Railway settlement observation as a case, and implements a prototype system finally, obtaining the following findings:a) Determined the overall functionality structure and the system module division of the Sharing Platform through the analysis;b) Realized the function of features management with layers which has not been provided by Google Maps Service.c) Researched the methods of retrieval to a large number of monitoring points rapidly, diverse statistic and expression to monitoring settlement information;d) Researched the methods of expression and observation statistic to small section;e) Implemented the prototype system of Settlement Information Sharing Platform for Beijing-Shanghai High-speed Railway based on B/S structure.