Fig. 2: Global density of marine traffic.
From: Tracking the global reduction of marine traffic during the COVID-19 pandemic
Density maps showing the average number of vessel transits per square kilometre per month during the first half of 2020 (January–June). Vessel categories: a all vessels, b cargo, c tanker, d passenger, e fishing and f other vessels. Density estimates plotted on a logarithmic (log 10) colour scale.
