fr_desact  en_act

Geographic coordinates

Latitude, longitude and elevation of a place. To specify a location on the surface of the planet, we can use a different system called "cartographic coordinates". To get a location on the Earth, it is necessary to use a geodetic system which gives the geographic coordinates * found on maps. The latter can be expressed either in the form of longitude and latitude (called geographic coordinates * ), or of a planar representation on a map (called projection coordinates). Regulatory projection in continental France is a Lambert Conformal Conic Projection (NTF geodetic system).

According to BRGM and Onema