K-Axis Voyage Science Event Log with Geospatial Coordinates

The K-Axis Science Event Log is a scanned PDF of the original paper logbook from the Aurora Australis marine voyage from mid-January to late February 2016. It documents sampling events, equipment deployments, and vessel positions recorded by scientists and technical staff. The log contains structured fields for event types, station numbers, and precise start/end coordinates in multiple formats.

Use Cases

• Reconstruct the vessel's path and event timing using start_lat_dec_deg, start_lon_dec_deg, end_lat_dec_deg, end_lon_dec_deg, start_date_utc, and end_time_utc fields.
• Analyze the frequency and distribution of different sampling activities by grouping events based on the event_type and event_type_prefix columns.
• Link scientific observations from other K-Axis datasets using the universal station_number or event_type_number as a join key.
• Assess operational patterns and voyage leg planning by examining the sequence of events per leg number and waypoint.
• Extract qualitative context for automated data processing by parsing the remarks field for researcher annotations.

Strengths

• Provides high-precision geospatial coordinates for event start and end in three formats (degrees-minutes, decimal degrees).
• Includes a unique event_number for chronological ordering and a universal station_number for cross-project data linkage.
• Covers a defined Antarctic research voyage over a specific time range from January to February 2016.

Limitations

• The primary data source is a scanned PDF, requiring OCR and manual parsing to extract structured tabular data, which introduces potential for errors.
• Event recording order (event_number) is noted as not strictly chronological, complicating time-series analysis.
• Sample size (number of logged rows/events) is unknown, limiting assessment of statistical significance.

Provenance

Source

Australian Antarctic Data Centre (AU_AADC) via NASA Earthdata.

Collection Method

Manual recording in a paper logbook by scientists and technical support staff during the K-Axis voyage, later scanned to PDF.

Time Range

Mid-January to late February 2016.

Freshness

Data is from a single voyage concluding on 2016-02-19, with no indicated updates.

Geography

Southern Ocean/Antarctic region, based on vessel track waypoints and station positions.