Green Railway Alignment Selection Decision Support System (GRASDSS) Based On GIS-research Of Integration And Man-machine Interface

The national "tenth five" plan of railway environment protection has pointed out clearly that the "green railway alignment selection" should be studied and put into practice.Based on the Project supported by National Natural Science Foundation of China(50578160), the thoughts and methods of systematic analysis are adopt, multi-objective decision making method is applied synthetically, GIS (Geographic information system) is used as its important supporting technique, DSS as its core theory,railway alignment environment impact factors as starting base, friendly man-machine interface is designed and the integration of GRASDSS (Green Railway Alignment Selection Decision Support System) is realized.The main work of this paper are as follows:1. The connotation and influence factors of the green railway alignment selection are analysised,the previous achievements are absorbed and some new improvements are made out:the new index system of Environmental Impact Assessment should be rebuilded and quantitative prediction value also should be used more in order to improve the precision of scheme comparison.2. The man-machine interactive system is designed according to the design purpose and principle of GRASDSS and the integration of system is completed.the man-machine interface should be humanism and kind in order to improve the maneuverability of this system. VB.NET and MapX are Integtated by taking full advantage of the good compatibility of them, some basic function such as zoom and delation and some essential functions such as thematic map,data banding and buffer area analysis are carried out, the minimum environment sensitivity corridor is confirmed, the Comparison and Selection to several railway route projects is completed after the several route projects are selected.3. The alternative alignment of the rebuilding railway of XuanCheng to HangZhou is used as an example to show the feasibility of the GRASDSS.First the assessment factors are confirmed Initially, the environment sensitivity analysis to the the place along the line are analysised by using the function of thematic map analysis in order to estimate the endurance against the environmental disruption , the route selection is guided by confirming the minimum environment sensitivity corridor. new index system are rebuilt by the matrix method,and the weight of evaluation factors are conformed by using Analytical Hierarchy Process, at last,an overall assessment to the alignments is made to get an optimal alignment by using Graphic Overlay Method based on GIS.