AIS data prepared by Statsat AS for December 2020

AIS data prepared and provided by Statsat AS (Norway) in the framework of the T-SAR project (<em>IKTPLUSS programme on reducing digital vulnerabilities, </em><strong>10 MNOK from the Research Council of Norway, Norway</strong>). The dataset contains AIS data (satellite + other) on a global coverage for 2020. There is one zip file and its name is the month (01 for January to 12 for December) ending with '.zip' and the zip file contains zipped Comma Separated Values (CSV) files; one per day. The CSV zipped files are named with the following convention: ais_YYYYMMDD.zip where YYYY is the year (here 2020), MM the month (01 to 12) and DD the day (01 to 31 depending on the month). For instance, ais_20200101.zip contains one single CSV file called ais_20200101.csv that corresponds to the 1st January 2020. The csv files have one header line: mmsi;lon;lat;date_time_utc;sog;cog;true_heading;nav_status;rot;message_nr;source where: <strong>mmii</strong> integer MMSI number of the vessel (AIS identifier). All records belonging to the same vessel will have the same identifier. <strong>lon</strong> float Geographical longitude (WGS84) between -180 to 180 <strong>lat</strong> float Geographical latitude (WGS84) between -90 to 90 <strong>date_time_utc</strong> datetime Date and Time (in UTC) when position was recorded by AIS. It is represented as: YYYY-MM-DD HH:MM:SS (for instance 2020-01-01 00:00:00). <strong>sog</strong> float Speed over ground (knots) <strong>cog</strong> float Course over ground (degrees) <strong>true_heading</strong> integer Heading (degrees) of the vessel's hull. A value of 511 indicates there is no heading data. <strong>nav_status</strong> integer Navigation status according to <strong>AIS Specification</strong> <strong>rot</strong> integer rate of turn <strong>message_nr</strong> integer message number <strong>source</strong> integer source is the source of AIS data ('g' for ground or 's' for satellite). One row in the CSV file corresponds to one message.