Figure 1
From: Identification of suspicious behavior through anomalies in the tracking data of fishing vessels
Statistics of the inter-event time and estimated speed between consecutive AIS locations. The central heatmap represents the joint probability density function \(\mathrm{pdf} (v,\Delta t)\) of observing a time delay Δt and an estimated speed v, defined as the traveled distance divided by Δt, while the bottom and left plots represent the marginal distributions of, respectively v and Δt