AIS data prepared by Statsat AS for August 2020

AIS data prepared and provided by Statsat AS (Norway) in the framework of the T-SAR project (IKTPLUSS programme on reducing digital vulnerabilities, 10 MNOK from the Research Council of Norway, Norway). 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: mmii integer MMSI number of the vessel (AIS identifier). All records belonging to the same vessel will have the same identifier. lon float Geographical longitude (WGS84) between -180 to 180 lat float Geographical latitude (WGS84) between -90 to 90 date_time_utc 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). sog float Speed over ground (knots) cog float Course over ground (degrees) true_heading integer Heading (degrees) of the vessel's hull. A value of 511 indicates there is no heading data. nav_status integer Navigation status according to AIS Specification rot integer rate of turn message_nr integer message number source 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.

本数据集由挪威Statsat AS公司在T-SAR项目框架下整理并提供，该项目隶属于挪威研究理事会资助的IKTPLUSS数字脆弱性减缓计划，获得1000万挪威克朗拨款。数据集包含2020年全球覆盖范围的AIS（Automatic Identification System，自动识别系统）数据，涵盖卫星及其他来源的数据。数据集采用单个压缩包形式存储与分发，压缩包以月份命名（01代表1月，12代表12月），后缀为.zip。压缩包内部包含按日打包的CSV（Comma Separated Values，逗号分隔值）文件，每日的数据对应一个压缩包。CSV压缩包的命名规则为：ais_YYYYMMDD.zip，其中YYYY为年份（此处为2020），MM为月份（01至12），DD为日期（依月份不同取值为01至31）。例如，ais_20200101.zip内部包含单个CSV文件ais_20200101.csv，对应2020年1月1日的AIS数据。所有CSV文件均包含一行表头，字段依次为：mmsi;lon;lat;date_time_utc;sog;cog;true_heading;nav_status;rot;message_nr;source，各字段说明如下：1. mmsi：整数类型，为船舶的MMSI（Maritime Mobile Service Identity，海上移动通信业务标识）编号（AIS识别码），同一船舶的所有记录将使用相同的识别码；2. lon：浮点数类型，为WGS84坐标系下的地理经度，取值范围为-180至180；3. lat：浮点数类型，为WGS84坐标系下的地理纬度，取值范围为-90至90；4. date_time_utc：日期时间类型，为AIS记录船舶位置时的UTC日期与时间，格式为YYYY-MM-DD HH:MM:SS（例如2020-01-01 00:00:00）；5. sog：浮点数类型，为对地航速，单位为节；6. cog：浮点数类型，为对地航向，单位为度；7. true_heading：整数类型，为船舶船体的真实航向，单位为度，取值511表示无有效航向数据；8. nav_status：整数类型，为符合AIS规范的航行状态；9. rot：整数类型，为转向率；10. message_nr：整数类型，为消息编号；11. source：整数类型，为AIS数据来源，其中'g'代表地面站，'s'代表卫星。CSV文件中的每一行对应一条AIS消息。