Geographic bathymetric grid data at 100 m x 100 m pixel resolution.
Collaboration of Canada, the United States of America and the European Union as part of the Atlantic Ocean Research Alliance's second project under the Galway Statement. Project mapped the North Atlantic seafloor along a transect from Halifax, Canada to Tromsø, Norway to further the understanding of marine habitats, conservation and navigation.
Chief Scientist / Primary Investigator name: Paola Travaglini
Platform: CCGS Louis S. St- Laurent (Canadian heavy icebreaker)
Device 1 type: Multibeam echo-sounder (sonar)
Device 1 manufacturer: Kongsberg
Device 1 model: EM122, hull installed behind ice protection window
Data and Data format:
100 m resolution grid of bathymetry
BAG format: Bathymetric Attributed Grid Object
Navigation and positioning:
Trimble GNSS receiver + antennas Applanix POS/MV v5 inertial measuring system Horizontal Datum: WGS84 (G1762)
Zero tide applied: tides are not well known for the major part of the data and tides over very deep water are generally negligible.
Sound Velocity Profile measurements:
In-situ sound velocity profiles were applied.
Note on accuracy/S-44 survey standards:
Considering the intended output from this survey (IHO Order 1a - Areas shallower than 100 metres where under-keel clearance is less critical but features of concern to surface shipping may exist.) and using an average depth of 2000m as ‘d’ in the IHO Standard Equation - the allowable Total Vertical Uncertainty (TVU) must be < 26m which indeed the data has achieved (by comparison with overlapping datasets from other surveys/agency data).
IHO Order 1a
Horizontal positioning accuracy: 5.0 m + 5% of depth (95% Confidence level)(~105 m at a mean depth of 2000 m)
Vertical positioning accuracy: 2.5 m < 26 m = Sqrt((0.5 m)^2+(0.013 x 2000 m)^2)
- Publisher - Current Organization Name: Fisheries and Oceans Canada
- Licence: Open Government Licence - Canada
Data and Resources
North Atlantic 2015 CCGS LSSL 100m grid of water depths during the voyageBAGEnglish French dataset BAG
Bathymetric Attributed Grid ObjectPDFEnglish guide PDF
EM122PDFEnglish guide PDF
Data DictionaryCSVEnglish French guide CSV
CHS_LSSL_Galway2016 North_Atlantic_HFX_TromsoHTMLEnglish French guide HTML
Atlantic 2015 CHS LSSL 100mESRI RESTEnglish web_service ESRI REST
Atlantic 2015 CHS LSSL 100mESRI RESTFrench web_service ESRI REST
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