AIS Shipping Voyages - Alaska - 2011-2013

These shapefiles (lines) are a derived set of shipping voyages from satellite-based Automatic Identification System (AIS) data collected from the exactEarth (http://www.exactearth.com/) satellite constellation. The files were large and disjointed CSV files that have been cleaned using tools developed in the Python language. The code is available via the link below.

The original point locations were obtained via the exactEarth company, and include copyrighted material of exactEarth Ltd. All Rights Reserved.

If users would like the original point locations, they should contact exactEarth (exactAIS@harris.com/) for information about licensing the data.

The project was made possible by exactEarth’s data stream and funded through the The Wildlife Conservation Society (WCS) and the Aleutian Bering Sea Islands Landscape Conservation Cooperative (ABSI). The codebase was built through a collaborative process with the Scenarios Network for Alaska and Arctic Planning (SNAP) at the International Arctic Research Center at the University of Alaska, Fairbanks Alaska.

Please give attribution to exactEarth, SNAP, WCS, and ABSI.

abstracted processing steps:

  1. cleaned raw CSV files by dropping any records that do not comply with a somewhat complex set of rules developed that constitute a 'complete' dataset.

  2. these cleaned CSV's were inner-joined with a table of known MMSI / IMS / ShipName / ShipType data that we received from Tim Robertson at Nuka Research and Planning Group (http://www.nukaresearch.com/), which removed a lot of errant ship location information and allowed for the grouping by ship types.

  3. the newly joined CSV files were then run through another algorithm for grouping the point locations into unique ship voyages. The set of rules applied were: a. vessel remains in the same location for >24 hours consecutively.
    b. vessel leaves the study region for >24 hours consecutively.
    c. using an a shapefile of land that has been eroded by 10km was used to drop off any points that cross land errantly. The erosion allows for location error when a ship is close to shore.

  4. the unique voyage groups were then grouped by ship type and then output to line shapefiles depicting the voyage transect.

Attributes include original AIS values. Additional ones we calculated are listed below:

Voyage = unique id for a single voyage
Direction = compass bearing (0.0-360.0)
simple_direction = compass bearing grouped into {'NE':(-1.0,90.0),'SE':(90.0,180.0),'SW':(180.0,270.0),'NW':(270.0,361.0)}
lon_begin = longitude value of the starting point of the transect
lon_end = longitude value of the ending point of the transect
lat_begin = latitude value of the starting point of the transect
lat_end = latitude value of the ending point of the transect
time_begin = time of stating point of the transect
time_end = time of ending point of the transect
bear_begin = bearing between the initial 2 points of the transect
bear_end = bearing between the ending 2 points of the transect
dir4_begin = this is the old 'simple_direction' with a 4-quadrant return of directionality between the first 2 points of the voyage
dir4_end = this is the old 'simple_direction' with a 4-quadrant return of directionality between the last 2 points of the voyage
dir8_begin = a new 8 direction version of the simple direction between the first 2 points of the voyage
dir8_end = a new 8 direction version of the simple direction between the last 2 points of the voyage

Data and Resources

Additional Info

Credits

The following people worked on producing this data set:

  • Michael Lindgren
  • The codebase was built through a collaboration with Scenarios Network for Alaska + Arctic Planning (SNAP) at the International Arctic Research Center in Fairbanks Alaska, the Aleutian Bering Sea Islands Landscape Conservation Cooperative (ABSI-LCC), and The Wildlife Conservation Society (WCS).
Field Value
Source http://data.snap.uaf.edu/data/Base/Other/Shipping/
Maintainer Michael Lindgren
Version 1.0
access_constraints ["https://creativecommons.org/licenses/by/4.0/"]
bbox-east-long 180
bbox-north-lat 81.37968
bbox-south-lat 38.02936
bbox-west-long -180
contact-email malindgren@alaska.edu
coupled-resource []
credits ["Michael Lindgren", "The codebase was built through a collaboration with Scenarios Network for Alaska + Arctic Planning (SNAP) at the International Arctic Research Center in Fairbanks Alaska, the Aleutian Bering Sea Islands Landscape Conservation Cooperative (ABSI-LCC), and The Wildlife Conservation Society (WCS)."]
dataset-reference-date [{"type": "publication", "value": "2015-12-22T13:46:00"}]
download-url http://data.snap.uaf.edu/data/Base/Other/Shipping/
frequency-of-update asNeeded
graphic-preview-description thumbnail
graphic-preview-file phase_3_meta_thumbnail_s.png
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licence []
license Creative Commons Attribution 4.0
license_url http://creativecommons.org/licenses/by/4.0/
metadata-date 2016-02-18T16:06:06
metadata-language
progress completed
resource-type
responsible-party [{"name": "Scenarios Network for Alaska and Arctic Planning", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-180.0, 38.02936], [180.0, 38.02936], [180.0, 81.37968], [-180.0, 81.37968], [-180.0, 38.02936]]]}
spatial-data-service-type
spatial-reference-system NAD83 / Alaska Albers (EPSG:3338)
spatial_harvester true