objectives: to locate the road emergency stations in fars province based on using spatial multi-criteria decision making (delphi method).    methods: in this study, the criteria affecting the location of road emergency stations have been identified through delphi method and their importance was determined using analytical hierarchical process (ahp). with regard to the importance of the criteria...

In this paper,we study the definition of the results for GIS queries. They are based on a graphical representation. Such a representation may introduce some ambiguities depending on the class of queries. We study two different ambiguities due to the aggregate functions and the notion of homogeneity.

To satisfy transport infrastructure requirement in a country in consonance to its developmental pace, decisions must be based on more reliable, update, relevant, easily accessible and affordable information. Geographic information system for transportation has now emerged as the technology with considerable potential for achieving dramatic gains in efficiency and productivity for multitude of t...