2 minute Southcentral Alaska Elevation Grid

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The 2-minute Southcentral Alaska Elevation Grid provides bathymetric data in ASCII raster format of 2-minute resolution in geographic coordinates. This grid is strictly for tsunami inundation modeling
Cite this dataset when used as a source.
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Distribution Formats Format not available
    Distributor DEM Information
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Dataset Publisher NOAA Center for Tsunami Research
    NOAA/PMEL/Center for Tsunami Research (NCTR)
    Time Period
    Spatial Reference System urn:ogc:def:crs:EPSG::4326urn:ogc:def:datum:EPSG::5868
    Spatial Bounding Box Coordinates
    N: 62.00
    S: 52.00
    E: -140.00
    W: -169.00
    Spatial Coverage Map
    Documentation links not available.
    Publication Dates
    • publication: 2004-06-23
    Edition 2004
    Data Presentation Form mapDigital
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency Irregular
    Supplemental Information
    This grid was developed through funding from the National Tsunami Hazard Mitigation Program. It will be updated as better data become available.
    Purpose This grid was constructed for use in tsunami inundation modeling
    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
    • NOAA/PMEL/Center for Tsunami Research (NCTR)
    Theme keywords NASA/GCMD Platform Keywords
    • Models/Analyses > DEM > Digital Elevation Model
    NASA/GCMD Data Resolution Keywords
    • 1 meter - < 30 meters
    • < 1 meter
    • Coastal Relief
    • Gridded elevations
    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
    • Southcentral Alaska
    • Alaska
    • Gulf of Alaska
    Project keywords Global Change Master Directory (GCMD) Project Keywords
    • ICSU-WDS > International Council for Science - World Data System
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Water Depth
    Use Constraints No constraint information available
    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.
    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
    • NOAA/PMEL/Center for Tsunami Research (NCTR)
    Processing Steps
    • 2004-06-01T00:00:00 - Each raw data source was converted into ESRI ArcGIS formats. The resulting files were converted and adjusted to predetermined projection (geographic), horizontal datum (NAD27), and vertical datum (MHW) using the ArcInfo PROJECT command and ArcView Spatial Analyst MAP CALCULATOR algorithm. A polyline shapefile was created to represent the coastline. The coastline is a culmination of USGS hydrographic vectors, USACE coastline, and AKRR coastline vectors. A TIN (Triangulated Irregular Network) was created using bathymetric data point and coastline points using ArcInfo CREATETIN. An 8-second grid was created using TINLATTICE. A 2-minute grid was created using Smith and Sandwell data to fill in remaining gaps. Smith and Sandwell data was compared with denser data to ensure continuity. The data was assessed for quality using ArcView Spatial Analyst. The grid was compared to its raw dataset. The 8-second grid was resampled to 2 minutes and merged with the Smith and Sandwell data. The grid was updated with recent datasets surrounding Homer-Seldovia, Kodiak, and Seward. New data was incorporated into the grids by creating new TINs for the regional area. Data were assessed for quality by comparing with original sources, corresponding sources, and control data. Continuity between old and new data were assessed and errors were corrected. The final grid was analyzed for blunders, systematic errors, and logical consistency.
    Processing Environment Native Dataset Environment: Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog
    Source Datasets
    • GEODAS Vol 2, Ver 4.2 and Global Relief
      • Electronic Nautical Charts
        • Multibeam surveys for Seward OPR-P359-RA-01
          • 1:25000 and 1:63360 hydrographic vectors
            • Homer, Seldovia, and Seward Hydrographic Surveys
              • Bathymetric Condition Survey
                Last Modified: 2017-11-09
                For questions about the information on this page, please email: dem.info@noaa.gov