The European maritime traffic data (AIS) published by EMODnet comprises 12 categories. This vessel density analysis groups the information into 5 classes:
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## [1] "West-Longitude: 8.53"
## [1] "South-Latitude: 42.22"
## [1] "East-Longitude: 8.71"
## [1] "North-Latitude: 42.42"
Map tiles by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under ODbL.