Chignik, Alaska 1/3 arc-second Coastal Digital Elevation Model

browse graphicArcGIS Hillshade DEM
NOAA's National Geophysical Data Center (NGDC) 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 DEM Information
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Dataset Point of Contact DEM Information
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Time Period 1915-01-01 to 2012-01-01
    Spatial Bounding Box Coordinates
    N: 56.36
    S: 56.28
    E: -158.34
    W: -158.58
    Spatial Coverage Map
    General Documentation
    Associated Resources
    Publication Dates
    • publication: 2014-02-28
    Edition 2
    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.
    Use Limitations
    • Produced by the NOAA National Geophysical Data Center. Not subject to copyright protection within the United States.
    • 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)
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    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
    • Earth Science > Land Surface > Topography > Terrain Elevation > Topographical Relief Maps
    • Earth Science > Oceans > Coastal Processes > Coastal Elevation
    • Coastal Relief
    • Gridded elevations
    • Integrated bathymetry and topography
    Global Change Master Directory (GCMD) Service Keywords
    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
    • Chignik
    • Alaska Peninsula
    • Gulf of Alaska
    • Alaska
    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
        • 2014-01-04T00:00:00 - All datasets obtained by NGDC were converted to common horizontal and vertical datums of WGS 84 geographic and Mean Higher High Water, respectively, based on tide station information and VDatum. They were also converted to common file format, ESRI point shapefiles, for visualization and inspection.
        • 2014-01-14T00:00:00 - Datasets were visually inspected with ArcGIS for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
        • 2014-02-01T00:00:00 - xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 1/3 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.
        • 2014-02-20T00:00:00 - 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.
        • 2014-02-25T00:00:00 - The DEM was quantitatively evaluated by comparing with source datasets. It was visually evaluated by converting to UTM-zone coordinates (units of meters horizontally and vertically) and by creating a slope grid to identify gridding artifacts in the DEM.
        Processing Environment Native Dataset Environment: Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog
        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: 1915-01-01 to 2006-01-01
        • Bench Mark Data Sheet with Tidal Datum References
          • Tides and Currents Station Selection
            Bench Mark Data Sheet for stations # 9458917, # 9457804, # 9459450
          • Description of Source: Tidal information table from which vertical datum adjustment information are interpreted
          • Temporal extent used: 1983-05-01 to 2011-04-01
        • Shuttle Radar Topography Mission (SRTM)
          • Shuttle Radar Topography Mission (download)
            global topography void filled, version 2, finished
          • Description of Source: Gridded topographic data
          • Temporal extent used: Unknown to
        • NGDC Multibeam Bathymetry Database
          • NGDC Multibeam Bathymetry Database (download)
            Multibeam swath sonar survey data
          • Description of Source: Multibeam bathymetry data
          • Temporal extent used: 2008-01-01 to 2011-01-01
        • Electronic Navigational Chart (ENC) digital soundings
        • Chignik GPS
          • DCRA CAD derived topography
            • Harbor condition survey for Chignik Harbor
              • Condition survey data of Chignik Harbor (download)
                Hydrographic Sounding at intervals and topographic data points along Project design lines spaced at specific intervals.
              • Description of Source: Harbor condition survey
              • Temporal extent used: 2010-07-20 to 2010-07-25
            Acquisition Information (collection)
              • Digital Elevation Model
              • NTHMP DEM Gridding Project
              Last Modified: 2017-11-22
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