Geographic base of the decentralized municipal entities (EMD) of Catalonia, with their names and codes, derived from the delimitation files of the entities and the municipalities to which they belong, and from reference cartographic sources. Of the boundaries of the polygons of the EMD represented in this base, only those that have a recognition act, a resolution published in the DOGC or a judicial resolution that determines the current official line are definitive, as long as they have coordinates in the current reference system. The rest of the boundaries must be considered provisional. The EMD are a type of entity with a territorial scope lower than the municipality, that is, local governments below the municipalities.

Geographic base that contains the current limits of the different administrative divisions that make up the territorial organization of Catalonia: the municipalities, the "comarques", the entity unique territorial area of the Aran Valley and the "vegueries"; also contains the provincial boundaries, the fixation of which it is state competence. It also includes the capitals of the municipality, the "comarques", the "vegueries", the provinces and Catalunya. The Base is multiscale. The official scale of territorial detail is 1: 5 000. From this the other scales of less detail are obtained, by cartographic generalization: 1:50 000, 1: 100,000, 1: 250,000, 1: 500,000, and 1: 1,000,000.

Reference topographic geoinformation with total or partial coverage of municipal management areas or geographic areas of specific themes that require detailed topographic information. It includes information related to the following layers: relief, hydrography, road network and other transport networks; buildings, constructions and facilities; land cover, toponymy and municipal inventories. This geoinformation can have different levels of resolution, corresponding to scales between 1:500 and 1:2000, although the most widely used is 1:1000.