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What is a vessel encounter? How can I interpret the data in the vessel encounter layer?

What is a vessel encounter? How can I interpret the data in the vessel encounter layer?
1

An encounter is anywhere that a refrigerated cargo vessel meets up with a fishing vessel while at sea. Our current algorithm requires these vessels both to not be moving and almost next to each other for a few hours. Specifically, the vessel encounters layer is identified from AIS data as locations where two vessels were continuously within 500 meters for at least 2 hours, while at least 10 km from a coastal anchorage.

We cannot know what, exactly, these vessels did during this encounter, but in many cases they are exchanging fish, supplies, or crew. 

Interpret the data by clicking on a cluster of encounters or zooming in to the map. Click on any encounter of interest to view the vessels that encountered each other along with the date and time this took place. If available, click on the link to the carrier vessel portal for more information.

You can read more about transshipment behavior from our report or scientific publication.

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