Christian Thom joined IGN-France after graduating from Ecole Polytechnique in 1981. He obtained his PhD at the Observatoire de le Côte d’Azur. He currently has the responsibility for the Laboratoire d’Opto-Electronique et Micro-Informatique at IGN Saint-Mandé. This laboratory is mainly involved in conception and realisation of specific instrumentation for the Institute, among them the digital aerial cameras used for the systematic survey of France, and the Geocube.