DOI: 10.6084/m9.figshare.29062715
title: Maritime Activities Observed Through Open-Access Positioning Data: Moving and Stationary Vessels in the Baltic Sea

description: Research data published with <i>Hütten, Moritz: Maritime Activities Observed Through Open-Access Positioning Data: Moving and Stationary Vessels in the Baltic Sea.</i><i> </i>Geomatics<b> </b>2025, 5(4), 69;<i> </i>https://doi.org/10.3390/geomatics5040069.<b>ais_messages_baltic.parquet:</b> Original messages streamed from aisstream.io between July 29, 2024 and October 27, 2024, in parquet format. Each row in the array represents a single message, with the columns:<br>lat: Latitude in decimal degreeslon: Longitude in decimal degreestimestamp: POSIX timestampmmsi: Vessel MMSI numbersog: Self-reported speed over ground, in knotstype: Self-reported vessel typedestination: Vessel destination name (uncleaned)<br><b>vessel_density_baltic_2024.tiff:</b> GeoTIFF file with 8 layers, containing the average vessel density in the Baltic Sea from the analysis of 91 days of AIS data between 07/28 to 10/27, 2024, in units of vessels per square kilometer and in lat/lon resolution of 15 arcsec/30 arcsec. The individual layers are:all vessels (moving & stationary)all stationary vesselspassenger/high-speed vessels (moving & stationary)other vessels, including fishing (moving & stationary)law enforcement, military vessels (moving & stationary)pilot, tug, rescue, dredging/diving vessels (moving & stationary)cargo vessels (moving & stationary)tanker vessels (moving & stationary)<b>cell_crossings_baltic_2024.tiff: </b>GeoTIFF file with 1 layer, containing the average number of cell crossings per day of moving vessels in the Baltic Sea from the analysis of 91 days of AIS data between 07/28 to 10/27, 2024, in units of vessels per day and in lat/lon resolution of 15 arcsec/30 arcsec.<b>speeds_baltic_2024.tiff:</b> GeoTIFF file with 1 layer, containing the average speed in each cell of moving vessels in the Baltic Sea from the analysis of 91 days of AIS data between 07/28 to 10/27, 2024, in units of knots and in lat/lon resolution of 15 arcsec/30 arcsec.<b>bearing_baltic_2024.tiff:</b> GeoTIFF file with 2 layers, containing the average vessel bearing in each cell in the Baltic Sea from the analysis of 91 days of AIS data between 07/28 to 10/27, 2024. The first layer contains the bearing angle clockwise from true North, the second layer the resultant length of the spherical mean in each cell. Lat/lon resolution is 15 arcsec/30 arcsec.<b>port_areas_baltic_2024.tiff: </b>GeoTIFF file with 1 layer, labeling 145 port areas inferred in the Baltic Sea from the analysis of AIS data between 07/28 to 10/27, 2024 in Hütten (2025), Section 3.3. The area value corresponds to the ID in <i>port_coords_baltic_2024.geojson.</i><b>port_coords_baltic</b><b>_2024.geojso</b><b>n:</b> GeoJSON file with 145 port coordinates inferred in the Baltic Sea from the analysis of AIS data between 07/28 to 10/27, 2024 in Hütten (2025), Section 3.3. The ID corresponds to the area value in<i> port_areas_baltic_2024.tiff.</i><b>base_stations_baltic_2024.geojson: </b>GeoJSON file with 147 static AIS base stations contributing to aisstream.io in the Baltic Sea inferred from the analysis of AIS data between 07/28 to 10/27, 2024.<b>Changelog:</b>Version 1 (2025-11-20): Initial upload.Version 2 (2025-11-27): Published version.Version 3 (2026-01-05): Corrected GeoJSON format (<i>port_coords_baltic_2024.geojson</i> & <i>base_stations_baltic_2024.geojson</i>) to be readable with most JSON parsers. Updated <i>README.txt</i> with the publication DOI, corrected section references, and version information.See also related data set <i>High-Resolution Mapping of Port Dynamics from Open-Access AIS Data in Tokyo Bay</i>.<br>