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Southern Alaska Coastal Relief Model

browse graphicThumbnail of DEM
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: NOAA National Geophysical Data Center. 2009: Southern Alaska Coastal Relief Model. NOAA National Centers for Environmental Information. https://doi.org/10.7289/V58G8HMQ. Accessed [date].
gov.noaa.ngdc.mgg.dem:703
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Distribution Formats
  • netCDF (Version:4 Classic)
Ordering Instructions Contact NCEI for other distribution options and instructions.
Distributor NOAA National Centers for Environmental Information
ncei.info@noaa.gov
Dataset Point of Contact NOAA National Centers for Environmental Information
ncei.info@noaa.gov
Dataset Point of Contact DEM Information
NOAA National Centers for Environmental Information
dem.info@noaa.gov
Time Period 1888-01-01 to 2009-01-01
Spatial Reference System urn:ogc:def:crs:EPSG::4326urn:ogc:def:crs:EPSG::5715
Spatial Bounding Box Coordinates
West:170
East:230
South:48.50
North:66.50
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
Historical archive - data has been stored in an offline storage facility
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.
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 Centers for Environmental Information. Not subject to copyright protection within the United States.
Dataset Citation
  • Cite as: NOAA National Geophysical Data Center. 2009: Southern Alaska Coastal Relief Model. NOAA National Centers for Environmental Information. https://doi.org/10.7289/V58G8HMQ. Accessed [date].
Cited Authors
  • NOAA National Geophysical Data Center
Publishers
  • NOAA National Centers for Environmental Information
Theme keywords Global Change Master Directory (GCMD) 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 > Topographical Relief Maps
  • Earth Science > Oceans > Coastal Processes > Coastal Elevation
Uncontrolled
  • Coastal Relief
  • Gridded elevations
  • Integrated bathymetry and topography
Global Change Master Directory (GCMD) Service Keywords
  • DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS > WEB-BASED GEOGRAPHIC INFORMATION SYSTEMS
  • DATA MANAGEMENT/DATA HANDLING > DATA SEARCH AND RETRIEVAL
  • DATA ANALYSIS AND VISUALIZATION > VISUALIZATION/IMAGE PROCESSING
Global Change Master Directory (GCMD) Service Keywords
  • DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS > WEB-BASED GEOGRAPHIC INFORMATION SYSTEMS
  • DATA MANAGEMENT/DATA HANDLING > DATA SEARCH AND RETRIEVAL
  • DATA ANALYSIS AND VISUALIZATION > VISUALIZATION/IMAGE PROCESSING
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
Platform keywords Global Change Master Directory (GCMD) Platform Keywords
  • Models/Analyses > DEM > Digital Elevation Model
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
Project keywords Global Change Master Directory (GCMD) Project Keywords
  • ICSU-WDS > International Council for Science - World Data System
Data Resolution keywords Global Change Master Directory (GCMD) Horizontal Data Resolution Keywords
  • 1 meter - < 30 meters
Global Change Master Directory (GCMD) Vertical Data Resolution Keywords
  • < 1 meter
Use Constraints
  • Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Access Constraints
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Other Constraints Cite as: NOAA National Geophysical Data Center. 2009: Southern Alaska Coastal Relief Model. NOAA National Centers for Environmental Information. https://doi.org/10.7289/V58G8HMQ. Accessed [date].
Fees
  • In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
Lineage information for:dataset
Processor
  • NOAA National Centers for Environmental Information
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
    • Time Instant: 2008-01-01
  • 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
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.
Last Modified: 2020-05-21
For questions about the information on this page, please email:ncei.info@noaa.gov