Teaching geomatics is a continuous challenge with the evolution of technologies which enables more and more accurate measurement and modelling of the environment. This paper will present an original pedagogical approach based on a teaching unit gathering students in architecture, civil an environmental engineering. Working together in collecting and visualizing data from the built and natural environment with advanced tools like laser scanners is a very stimulating approach that requires multiple competences in mapping and data analysis. A number of practical examples (bridge maintenance, archaeological site, city management) are presented from the field operations to the 3D visualisation and mapping. Each of these topics is illustrated with comparison maps.