Hello,
I am trying to understand the concept of a digital map in a navigation system in a car. Every car today has a GPS installed inside. It calculates the position of the CAR with the GPS and plot the position on the Digital map. The digtal map has a lot of information like road signs, roundabouts and everything. I want to know how this information is recorded at the first place. And also the general data format of the Digital map. How the Navigation system know there is a hospital infront or a road junction or a set of traffic lights.
Above all I want to know about the data representation format.