Barkley Sound, Canada 1 arc-second Coastal Digital Elevation Model

NOAA's National Centers for Environmental Information is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated bathymetric-topographic DEMs are used to support tsunami forecasting and warning efforts at the NOAA Center for Tsunami Research, Pacific Marine Environmental Laboratory (PMEL). The DEMs are part of the tsunami forecast system SIFT (Short-term Inundation Forecasting for Tsunamis) currently being developed by PMEL for the NOAA Tsunami Warning Centers, and are used in the MOST (Method of Splitting Tsunami) model developed by PMEL to simulate tsunami generation, propagation, and inundation.
Cite this dataset when used as a source.
  • ID not available.
Download Data
Distribution Formats
  • netCDF (Version: 4 Classic)
Distributor DEM Information
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Dataset Point of Contact DEM Information
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Coverage Description ISO valid extents for Barkley Sound 1 sec. DEM
Time Period 1933-01-01 to 2014-04-23
Spatial Reference System urn:ogc:def:datum:EPSG::5703
Spatial Bounding Box Coordinates
N: 48.7
S: 49.11
E: -124.89
W: -125.57
Spatial Coverage Map
General Documentation
Associated Resources
Publication Dates
  • publication: 2015-12-18
Edition First
Data Presentation Form mapDigital
Dataset Progress Status Complete - production of the data has been completed
Data Update Frequency As needed
Purpose Developed for the Pacific Marine Environmental Laboratory (PMEL), NOAA Center for Tsunami Research program in support of NOAA's tsunami forecasting and warning efforts.
Use Limitations
  • Not to be used for navigation. Although these data are of high quality and useful for planning and modeling purposes, they are not suitable for navigation. For navigation, please refer to the NOS nautical chart series.
  • Produced by the NOAA National Geophysical Data Center. Not subject to copyright protection within the United States.
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • Dataset contact information not available
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Theme keywords NASA/GCMD Earth Science Keywords
  • Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
  • Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry
  • Earth Science > Oceans > Bathymetry/Seafloor Topography > Water Depth
  • Earth Science > Land Surface > Topography > Terrain Elevation
  • Earth Science > Land Surface > Topography > Topographical Relief Maps
  • Earth Science > Oceans > Coastal Processes > Coastal Elevation
NASA/GCMD Platform Keywords
  • DEM > Digital Elevation Model
NASA/GCMD Data Resolution Keywords
  • H: 1 meter - < 30 meters
  • V: 1 meter - < 10 meters
  • Coastal Relief
  • Gridded elevations
  • Integrated bathymetry and topography
Global Change Master Directory (GCMD) Service Keywords
Place keywords NASA/GCMD Location Keywords
  • Continent > North America > Canada > British Columbia
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
  • Barkley Sound
  • British Columbia
  • Canada
  • Alberni Straight
  • Vancouver Island
      Use Constraints No constraint information available
      Fees Fee information not available.
      Lineage information for: repository
      Processing Steps
      • 2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
      Lineage information for: dataset
      Processing Steps
      • 2015-10-28T00:00:00 - All datasets obtained by NCEI were transformed to common horizontal and vertical datums of WGS 84 geographic and NAVD88, respectively, using constant offsets and transformation parameters in NOAAs VDatum software. They were also converted to common file format for visualization and inspection.
      • 2015-10-28T00:00:00 - Datasets were visually inspected with ArcGIS for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
      • 2015-10-28T00:00:00 - Older and low-resolution data were clipped to newer and high-resolution data where inconsistencies occured in overlap areas of the datasets.
      • 2015-10-28T00:00:00 - Topographic data was filtered to remove water surface points where they existed
      • 2015-10-30T00:00:00 - xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 1 arc-second grid that interpolated to fill empty cells. Points extracted every 5 meters along the coastline were also included to ensure that the bathymetric grid reached zero at the coast. The resulting Arc ASCII grid was clipped to the coastline to remove values over land using GDAL.
      • 2015-11-12T00:00:00 - xyz files for each input dataset were gridded using MB-System's 'mbgrid' tool, which utilizes a high-tension spline interpolation method to fill grid cells with no input elevation values. Preferential weighting was given to more recent, higher-accuracy datasets.
      • 2015-11-14T00:00:00 - The DEM was quantitatively evaluated by comparing with source datasets.
      Processing Environment Native Dataset Environment: Linux 4.1.6-200.fc22.x86_64 #1 x86_64 GNU/Linux
      Source Datasets
      • Bathymetry data for offshore BC at a resolution of 500 metres
        • Geonetwork Opensource (download)
          Marine Data for BC Geonetwork
        • Description of Source: Source Contribution: bathymetric surface
      • Alberni-Clayoquot Regional District
        • GeoBC
          • NOAA OCM Digital Coast (download)
            GeoBC, creates and manages geospatial information and products, as well as provides consultation services across all natural resource sector (NRS) agencies.
          • Description of Source: Source Contribution: High-resolution Topographic data
        • Canadian Hydrographic Service
          • Canadian Digital Surface Model
            • Canadian Digital Surface Model (download)
              The CDSM is part of Natural Resources Canada's altimetry system designed to better meet the users' needs for elevation data and products.
            • Description of Source: Source Contribution: Topographic Surface
          • VDatum software v. 3.4
            • VDatum (download)
              Vertical Datum Transformation tool
            • Description of Source: Source Contribution: vertical datum transformation tool
            • Temporal extent used: Unknown to
          Last Modified: 2017-11-13
          For questions about the information on this page, please email: