Since the Gravimetric Map on a scale of 1/500 000 was published in 1987, the Geological Survey of Catalonia (SGC) published in 1989 the Geological and the Aeromagnetic maps on a scale of 1/250 000. The publications of the Hydrogeological map on a scale of 1/250 000 (1992) and a crustal-scale cross-section on a scale of 1/200 000 (1993) followed the first maps. Currently the Survey is developping a project of regional geological mapping on a scale of 1/25 000 wich aim is to cover the entire area of Catalonia (about 31 879 sq.km), which is included into 301 sheets. The Survey is also involved in a project of detailed geological mapping of the highly populated, neighbouring area of Barcelona (about 3 180 sq. km.) on a scale of 1/10 000. Other projects the Survey is going on are the Structural Map on a scale of 1/250 000 and a new edition of the Geological Map at the same scale. Either the hardware and software facilities, the topographic bases, and the edition and publication works are supplied by the Cartographic Institute of Catalonia (ICC). The aim of this paper is to give general information about these project
