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The paper is devoted to the problem of ensuring navigation safety on the sea. The task of determining patterns of motion parameters (clustering) in a multidimensional phase space (coordinates, velocity, course, etc.) is considered. It is proposed to refer to the retrospective data on the movement of vessels provided by the Automatic Identification System (AIS) and available on open Internet resources. One of the results of solving a general problem is the idea of the intensity of movement in the water area. The paper introduces a set of traffic intensity metrics based on the number and trajectory properties of vessels passing through certain water area.

Metrics for Marine Traffic Safety Estimation with Respect to Data of Automatic Identification System