In 2005, the Order of Surveyors-Experts created the GNSS TERIA network and the EXAGONE company responsible for the implementation and management of this network. TERIA is a system offering centimetric positioning in real time. More specifically, it is an innovative tool for locating and geo-referencing digital geographic information in a single repository throughout the national territory. In a "Quality of its management" approach, TERIA is, to date, the only French GNSS network certified QUALITY and ENVIRONMENT ISO 9001 - ISO 14001. Today, TERIA is made up of more than 200 fixed satellite data reception stations in France and abroad.