National Geophysical Data Center (NGDC), NOAA Satellite and Information Service

View Metadata As: Get Data, FAQ, HTML, 19139 XML
Assess Metadata For: Completeness, DOI Readiness, CSW Readiness, Components

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].

Dataset Information
Search and Download
Distribution Formats
  • ASCII xyz
  • ASCII raster
  • NetCDF
  • binary float
Distributor Distributor information not available
No point of contact available for this dataset
Documentation links not available.
  • Dataset contact information not available
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Publisher information not available.
  • publication: 2009-06-30
Edition: First
Data Presentation Form: mapDigital
Dataset Progress Status Complete
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.
Time Period: 1888-01-01  to  2009-01-01
Spatial Reference System:
Spatial Bounding Box Coordinates:
N: 66.50
S: 48.50
E: -130
W: 170
Spatial Coverage Map:
  • 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
  • DEM > Digital Elevation Model
  • H: 1 meter - < 30 meters
  • V: < 1 meter
  • Coastal Relief
  • Gridded elevations
  • Integrated bathymetry and topography
  • Continent > North America > United States of America > Southern Alaksa
  • Ocean > Pacific Ocean
  • Ocean > Gulf of Alaska > Alaska
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
  • Alaska
  • Gulf of Alaska
  • Bering Sea
  • Prince William Sound
  • Aleutian Islands
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].
  • No charge for download
Source Datasets
  • NOS Hydrographic Surveys
  • NGDC Multibeam Bathymetry Database
  • Electronic Navigational Chart (ENC) soundings
  • Shuttle Radar Topography Mission (SRTM) processed by CGIAR
  • USGS NED topography
  • NGDC Bathymetric-topographic DEMs
  • U.S. Fish and Wildlife Service coastline
  • NGA Global Shoreline
  • Global Self-consistent, Hierarchical, High-resolution Shoreline (GSHHS)
Lineage Statement Lineage statement not available.
Processing Steps
  • 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.
  • 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.
  • 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.
  • 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.
  • The DEM was quantitatively evaluated by comparing the grid against source data files.

Metadata Last Modified: 2015-09-03

For questions about the information on this page, please email: