The Institut Cartogràfic i Geològic de Catalunya (ICGC) is the mapping and geology agency of Catalonia, an autonomous community of Spain. It produces high-quality regional base data: topographic maps at multiple scales, orthophotos, elevation models from lidar, and geological mapping.
Because Spain's autonomous communities maintain their own detailed cartography, ICGC is the authoritative source for Catalonia rather than the national IGN. Its data is largely CC BY licensed and available as downloads and OGC services, ideal for detailed regional work.