  Although man has become sedentary over time, his wish to travel the world
remains as strong as ever. The aim of this paper is to show how techniques
based on imagery and Augmented Reality (AR) can prove to be of great help when
discovering a new urban environment and observing the evolution of the natural
environment. The study's support is naturally the Smartphone which in just a
few years has become our most familiar device, which we take with us
practically everywhere we go in our daily lives.
