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Abstract:
M2 Vessel presence derived from AIS data 2019-2020
Quality
Data from the Automatic Identification System (AIS) for vessels was obtained from The Norwegian Coastal Administration. Four different distance buffers (10, 25, 50 and 100 km) were plotted around M2 AURAL location. AIS location points contained information such as the Maritime Mobile Service Identity (MMSI, conveying the ship ID), position and time. These were combined with the distance buffers, and the points falling on land, related to buoys or not relatable to vessels, were eliminated (QGIS 3.16 Hannover). Then, csv files from the resulting interceptions were exported and analyzed in R (R version 4.0.5) to calculate the number of vessels per day in each area.
Variables: Date: date Vessel_10: Number of vessels within 10 km radius from the recorder per day; Vessel_25: Number of vessels within 25 km radius from the recorder per day; Vessel_50: Number of vessels within 50 km radius from the recorder per day; Vessel_100: Number of vessels within 100 km radius from the recorder per day; V10: Number of vessels within 10 km radius from the recorder per day; V25: Number of vessels between 10 to 25 km radius from the recorder per day; V50: Number of vessels between 25 to 50 km radius from the recorder per day; V100: Number of vessels between 50 to 100 km radius from the recorder per day; Acoustic: Number of acoustic detections of vessels per day