The portals of the Barcelona City Council, Open Data BCN, open data portal and CartoBCN, cartography portal , adhere to the collaborative OpenStreetMap (OSM) project which aims to create free content maps using data obtained through mobile GPS devices, orto photographs and other data sources , to which the previously mentioned ones of the local administration of the city of Barcelona are added. The document of agreement and conditions is published on the website of OpenStreetMap.