Optimum Route Corridor Allocation Based on Environmental Conditions by Application of Geographic Information System

To design path corridor based on construction cost, designers mainly notice to geometricaldesign factors and primary construction cost, while some other effectivefactors may be ignored. Environmental condition is another effective factor thathas a significant effect on recognition, selection and determination of path corridor.Examination of all environmental parameters is very important and if they can beprocessed simultaneously with other effective factors, many useful results will beextracted for optimum design. According to the proposed model in this study, asite in frame of GIS system was considered regarding to frequency of informationlayers and effective factors on recognition and determination of path corridor. Allgraphical maps and descriptive information for the site between two path ends wasentered as separate layers, and each layer was weighted proportional to its effectin decision-making, and money value is assigned to their components. Then alldescriptive and graphical information are classified by the software and processedby mathematical analytical methods and will be modified to cost map or total effectivevalue. Then a vector network is constructed onto this map by software, andinformation on cost map is transferred to the vector network upon view of designer.Finally, the best and the cheapest path is selected by the software upon differentalgorithms. This method increases precision of recognition of optimum variant orderly,introduces all possible variants in details, decreases evaluation time of variantsand cost significantly.