Atka, Alaska 8/15 arc-second Coastal Digital Elevation Model

NOAA's National Centers for Environmental Information is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the National Tsunami Hazard Mitigation Program's (NTHMP) efforts to improve community preparedness and hazard mitigation. These integrated bathymetric-topographic DEMs are used to support tsunami and coastal inundation mapping. Bathymetric, topographic, and shoreline data used in DEM compilation are obtained from various sources, including NGDC, the U.S. National Ocean Service (NOS), the U.S. Geological Survey (USGS), the U.S. Army Corps of Engineers (USACE), the Federal Emergency Management Agency (FEMA), and other federal, state, and local government agencies, academic institutions, and private companies. DEMs are referenced to various vertical and horizontal datums depending on the specific modeling requirements of each State. For specific datum information on each DEM, refer to the appropriate DEM documentation. Cell sizes also vary depending on the specification required by modelers in each State, but typically range from 8/15 arc-second (~16 meters) to 8 arc-seconds (~240 meters).
Cite this dataset when used as a source.
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    Distributor Distributor information not available
    Dataset No POCs available for this dataset
    Coverage Description ISO valid extents for Atka 8/15 sec. DEM
    Time Period
    Spatial Reference System urn:ogc:def:crs:EPSG::4326MHHW
    Spatial Bounding Box Coordinates
    N: 52.30
    S: 52.07
    E: -174.00
    W: -174.26
    Spatial Coverage Map
    General Documentation
    Associated Resources
    Publication Dates
    • publication: 2017-02-03
    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 University of Alaska at Fairbanks (UAF), Geophysical Institute for tsunami and coastal inundation modeling efforts for the State of Alaska.
    • Dataset contact information not available
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    • National Tsunami Hazard Mitigation Program (NTHMP)
      Publisher information not available.
    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
    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
    • Vertical Location > Land Surface
    • Vertical Location > Sea Floor
    North Pacific
    • Atka
    • Alaska Peninsula
    • Aleutian Islands
    • Alaska
    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 No constraint information available
      Fees Fee information not available.
      Lineage information for: dataset
      • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
      Processing Steps
      • 2017-01-10T00:00:00 - All datasets obtained by NCEI were converted to common horizontal and vertical datums of WGS 84 geographic and Mean Higher High Water, respectively, based on tide station information. They were also converted to common file format, ESRI point shapefiles, for visualization and inspection.
      • 2017-01-20T00:00:00 - Datasets were visually inspected with ArcGIS and Global Mapper for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
      • 2017-01-25T00:00:00 - xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 8/15 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 imported into ArcGIS and clipped to the coastline to remove values over land.
      • 2017-01-28T00:00:00 - 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.
      • 2017-02-03T00:00:00 - The DEM was quantitatively evaluated by comparing with source datasets.
      Processing Environment Native Dataset Environment: Microsoft Windows 7 Enterprise; ESRI ArcGIS
      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: NOS hydrographic survey data
        • Temporal extent used: 1933-01-01 to 1988-01-01
      • Bench Mark Data Sheet with Tidal Datum References
        • Tides and Currents Station Selection
          Bench Mark Data Sheet for station # 9461380
        • Description of Source: Tidal information table from which vertical datum adjustment information are interpreted
        • Temporal extent used: 1983-01-01 to 2001-12-31
      • Adak Island Alaska IFSAR DEM Data (legacy dataset)
        • Alaska IfSAR DEM Data hosted by GINA (download)
          This data set is a digital elevation model (DEM) product that populates the GLOBAL Terrain product catalog. The DEM products are generated using the Intermap STAR-3i airborne interferometric synthetic aperture radar (SAR) system mounted in a LearJet 36A aircraft.
        • Description of Source: Interferometric Synthetic Aperture Radar (IFSAR) DSM
        • Temporal extent used: Unknown to
      • Shuttle Radar Topography Mission 1 Arc-Second Global: SRTM1N54W164V3
        • Shuttle Radar Topography Mission (download)
          The Shuttle Radar Topography Mission (SRTM) was a partnership between NASA and the National Geospatial-Intelligence Agency (NGA). Flown aboard the NASA Space Shuttle Endeavour (11-22 February 2000), SRTM fulfilled its mission to map the world in three dimensions. The USGS is under agreement with NGA and NASA's Jet Propulsion Laboratory to distribute SRTM elevation products derived from the C-band radar data. SRTM utilized interferometric C-band Spaceborne Imaging Radar to generate elevation data over 80 percent of the Earth's land surface. Global SRTM data at a resolution of 1 arc-second have been edited to delineate and flatten water bodies, better define coastlines, remove spikes and wells, and fill small voids. Larger areas of missing data or voids were filled by the NGA using interpolation algorithms in conjunction with other sources of elevation data. The SRTM 1 Arc-Second Global data offer worldwide coverage of void filled data at a resolution of 1 arc-second (30 meters) and provide open distribution of this high-resolution global data set.
        • Description of Source: Gridded topographic data
        • Temporal extent used: Unknown to
      • UAF Adak, Alaska GPS
        Last Modified: 2017-11-22
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