Australian Search and Rescue Region: Vessel Tracking - Aggregated data product (2012 - ongoing) (NESP MaC 5.9, IMOS)

The vessel tracking data in this product originates from the Australian Maritime Safety Authority’s (AMSA) Craft Tracking System (CTS) and Mariweb databases. These systems collect Automatic Identification System (AIS) signals from ships using both terrestrial and satellite receivers. AIS data from these sources, covering the period from September 2012 to the most recently completed month, provides vessel position reports across the entire Australian Search and Rescue Region. Each record represents a single vessel position defined by geographic coordinates and the time of transmission in Coordinated Universal Time (UTC).To create a consistent and usable dataset, the monthly AMSA vessel tracking files have been processed and standardised into a set of single annual datasets. This processing includes ingesting the source Shapefiles from AMSA’s operational data service, cleaning and validating the vessel position reports, converting timestamps to UTC, applying H3 spatial indexing, and ensuring all records follow a uniform data schema. Any invalid or duplicate reports identified during this workflow are separated into a dedicated rejected records dataset. The resulting product is a harmonised, reliable, and reproducible record of vessel movements throughout the Australian Search and Rescue Region over more than a decade.本产品的船舶追踪数据源自澳大利亚海事安全局（Australian Maritime Safety Authority, AMSA）的船舶追踪系统（Craft Tracking System, CTS）与Mariweb数据库。该两套系统通过地面与卫星接收器收集船舶搭载的自动识别系统（Automatic Identification System, AIS）信号。上述来源的AIS数据时段覆盖2012年9月至最近一个完整月份，可生成澳大利亚全境搜救区域内的船舶位置报告。每条记录对应单个船舶位置，由地理坐标与协调世界时（Coordinated Universal Time, UTC）下的传输时间定义。为构建一致且可用的数据集，研究团队将月度AMSA船舶追踪文件处理并标准化为年度单一数据集集合。该处理流程包括从AMSA运营数据服务中获取原始Shapefiles文件，对船舶位置报告进行清洗与校验，将时间戳转换为协调世界时，应用H3空间索引，并确保所有记录遵循统一的数据模式（schema）。在此流程中识别出的无效或重复报告将被分离至专用的拒绝记录数据集。最终产出的成果是一套统一协调、可靠且可复现的船舶运动记录，完整覆盖澳大利亚搜救区域内十余年的船舶活动数据。