Southern Alaska Coastal Relief Model

browse graphicShaded-relief image of the CRM
NOAA's National Geophysical Data Center (NGDC) is building coastal-relief models (CRM) for select U.S. coastal regions. Bathymetric, topographic, and shoreline data used in DEM compilation are obtained from various sources, including NGDC, the U.S. National Ocean Service (NOS), the National , the United States Geological Survey (USGS), the National Aeronautics and Space Administration, the Office of Coast Survey (OCS) and other federal, state, and local government agencies, academic institutions, and private companies. DEMs are referenced to the vertical tidal datum of Mean Sea Level (MSL) and horizontal datum of World Geodetic System 1984 (WGS 84). Grid spacings for the Southern Alaska CRM is 24 arc-seconds (~720 meters).
  • Cite as: National Geophysical Data Center, 2009. Southern Alaska Coastal Relief Model. National Geophysical Data Center, NOAA. doi:10.7289/V58G8HMQ [access date].
gov.noaa.ngdc.mgg.dem:703
Download Data
Distribution Formats Format not available
    Distributor DEM Information
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    dem.info@noaa.gov
    Dataset Point of Contact DEM Information
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    dem.info@noaa.gov
    Time Period 1888-01-01 to 2009-01-01
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Bounding Box Coordinates
    N: 66.50
    S: 48.50
    E: 230
    W: 170
    Spatial Coverage Map
    General Documentation
    Associated Resources
    Publication Dates
    • publication: 2009-06-30
    Edition First
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency As needed
    Purpose The CRM provides a framework to enable scientists to model wave propagation and ocean circulation. In addition, it may be useful for benthic habitat research, weather forecasting, and environmental stewardship.
    Dataset Citation
    • Cite as: National Geophysical Data Center, 2009. Southern Alaska Coastal Relief Model. National Geophysical Data Center, NOAA. doi:10.7289/V58G8HMQ [access date].
    Custodians
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Publishers
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Theme keywords Global Change Master Directory (GCMD) Science and Services 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 > Topographical Relief Maps
    • Earth Science > Oceans > Coastal Processes > Coastal Elevation
    NASA/GCMD Platform Keywords
    • Models/Analyses > DEM > Digital Elevation Model
    NASA/GCMD Data Resolution Keywords
    • 1 meter - < 30 meters
    • < 1 meter
    Uncontrolled
    • Coastal Relief
    • Gridded elevations
    • Integrated bathymetry and topography
    Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Place keywords Global Change Master Directory (GCMD) Location Keywords
    • Continent > North America > United States of America > Alaska
    • Ocean > Pacific Ocean > North Pacific Ocean > Gulf of Alaska
    • Vertical Location > Land Surface
    • Vertical Location > Sea Floor
    Uncontrolled
    • Alaska
    • Southern Alaska
    • Gulf of Alaska
    • Bering Sea
    • Prince William Sound
    • Aleutian Islands
    Keywords
      Use Constraints No constraint information available
      Other Constraints Cite as: National Geophysical Data Center, 2009. Southern Alaska Coastal Relief Model. National Geophysical Data Center, NOAA. doi:10.7289/V58G8HMQ [access date].
      Fees Fee information not available.
      Lineage information for: dataset
      Processing Steps
      • 2008-06-15T00:00:00 - All datasets obtained by NGDC were converted to common horizontal datum of WGS 84 geographic using FME or ArcGIS. They were also converted to common file format, ESRI point shapefiles or digital rasters, for visualization and inspection.
      • 2008-07-02T00:00:00 - Datasets were visually inspected with ArcGIS and QT Modeler for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
      • 2009-02-15T00:00:00 - xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 20 arc-second grid that interpolated to fill empty cells. Points extracted every 10 meters along the coastline were also included to ensure that the bathymetric grid reached zero at the coast. The resulting Arc ASCII grid was imported into ArcGIS and clipped to the coastline to remove values over land.
      • 2009-05-20T00:00:00 - 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. Gridding was performed in quadrants, each with a 5% data buffer. The grids were imported in ArcGIS and seamlessly merged to create the final DEM.
      • 2009-05-30T00:00:00 - The DEM was quantitatively evaluated by comparing the grid against source data files.
      Source Datasets
      • NOS Hydrographic Surveys
        • NOS Hydrographic Survey Database (download)
          Digital database of NOS hydrographic surveys that date back to the late 19th century.
        • Description of Source: Source Contribution: hydrographic surveys ; Source Type: online
        • Temporal extent used: 1888-01-01 to 2005-01-01
      • NGDC Multibeam Bathymetry Database
        • NGDC Multibeam Bathymetry Database (download)
          Multibeam swath sonar survey data
        • Description of Source: Source Contribution: Multibeam bathymetry data ; Source Type: online
        • Temporal extent used: 1986-01-01 to 2005-01-01
      • Electronic Navigational Chart (ENC) soundings
        • Electronic Navigational Chart (ENC) soundings (download)
          ENC soundings extracted from NOS charts
        • Description of Source: Source Contribution: ENC soundings extracted from NOS charts ; Source Type: web
        • Temporal extent used: Unknown to
      • Shuttle Radar Topography Mission (SRTM) processed by CGIAR
      • NGDC ETOPO1
        • NGDC ETOPO1 (download)
          Integrated bathymetric-topographic global DEM
        • Description of Source: Source Contribution: bathymetry and topography ; Source Type: online
        • Temporal extent used: 2007-01-01 to 2008-01-01
      • USGS NED topography
        • USGS National Elevation Dataset (download)
          Digital database of U.S. topography, in raster form (DEM)
        • Description of Source: Source Contribution: Topographic DEM ; Source Type: online
        • Temporal extent used: 1999-01-01 to 2003-01-01
      • NGDC Bathymetric-topographic DEMs
        • NGDC Bathymetric-topographic DEMs (download)
          Integrated bathymetric-topographic DEMs
        • Description of Source: Source Contribution: NGDC Bathymetric-topographic DEMs ; Source Type: online
        • Temporal extent used: 2006-01-01 to 2009-01-01
      • U.S. Fish and Wildlife Service coastline
        • Seamless digital coastline of the state of Alaska compiled from a variety of sources. (download)
          The U.S. Fish and Wildlife Service has compiled a seamless digital coastline of the State of Alaska from a variety of sources, including: the National Hydrography Dataset, NOAA nautical charts, U.S. Fish and Wildlife Service, National Geographic Topo Software, U.S. Army Corps of Engineers, and Alaska Department of Natural Resources.
        • Description of Source: Source Contribution: composite shoreline ; Source Type: online
        • Temporal extent used: 1995-01-01 to 2006-01-01
      • NGA Global Shoreline
        • National Geospatial-Intelligence Agency (download)
          The NGA Global Shoreline Data is an unclassified vector dataset generated by Earth Satellite Corporation
        • Description of Source: Source Contribution: shoreline ; Source Type: online
        • Temporal extent used: 1998-01-01 to 2002-01-01
      • Global Self-consistent, Hierarchical, High-resolution Shoreline (GSHHS)
        • National Geophysical Data Center (download)
          GSHHS is a high-resolution shoreline data set created from two well-known, public domain data sets.
        • Description of Source: Source Contribution: shoreline ; Source Type: online
        • Temporal extent used: 2003-01-01 to 2010-01-01
      Last Modified: 2018-02-13
      For questions about the information on this page, please email: dem.info@noaa.gov