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From the dataset abstract

EMODnet Vessel Density Map were created by Cogea in 2019 in the framework of EMODnet Human Activities, an initiative funded by the EU Commission. The maps are based on AIS data purchased...

Source: AIS data on maritime traffic density per types of vessels (Other, Fishing, Service, Dredging or underwater ops, Sailing, Pleasure Craft, High speed craft, Tug and towing, Passenger, Cargo, T anker, Military and Law Enforcement, Unknown and All ship types)