This thesis examines the use of Automatic Identification System (AIS) information to generate a picture of maritime activity. It derives suitable methods to produce tracks of vessel movements, both in littoral and open-ocean scenarios, removing ambiguities and highlighting doppelg�anger. The thesis then goes on to describe techniques to improve our understanding of maritime activities through the extraction of individual vessel behaviours and the generation of models describing normal behaviours to highlight abnormalities.
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