I. Introduction
A Geographic Information System (GIS) is an automated information system that is able to compile, store, retrieve, analyze and display mapped data [1]. GIS system combines various layers [fig. 1] of information about a place for better understanding and depending on the purpose, different layers can be put together for better analysis. The requirements of the different layers include, finding the best location for a new store, analyzing environmental damage, viewing similar crimes in a city to detect a pattern, keeping an overview of the electrical grid and so on. The power of a GIS over paper maps is its ability to select the information needed depending up on the intended application.