ABSTRACT
For several years, new geographical and urban applications have been emerging in which communications and real time have been very important characteristics. In other words, we no longer have to deal with applications for which conventional cartography is the target, but in which spatial aspects are involved in management in real time or with very strong temporal constraints, such as mission-critical applications. For this kind of problem, the intensive usage of positioning systems (such as GPS) is the key element, allowing vehicles to know their position and to exchange any kind of information by any kind of telecommunication means.
