Page 103 - Demo

7Automatic Identification System Data Fusion91Marine Research of the National Academy of Marine ResearchDOI: 10.29677/MR.202406_4(1).0006 Based on the AIS data from the NAMR, for the vessel with MMSI 440687000, all of its AIS entries had a ship speed (SOG) value of 0, indicating a stationary state. In Figure 10, this vessel was classified as a stationary vessel. However, when examining the great circle distance between this AIS entry (marked in the red box) and the consecutive AIS entry, it exceeded the average great circle distance for the vessel's stationary period as shown in the red box in Figure 11. Therefore, this AIS entry was considered abnormal and should be deleted. The abnormal location of this vessel is indicated by the red box in Figure 12, while the vessel's actual berth is represented by the yellow box. The distance between these two locations is approximately 611.883 meters according to the great circle distance calculation.Figure 11. MMSI 440687000 mean great circle distance during ship stay.Figure 10. Ship information with MMSI of 440687000.