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Dutch Harbor, Alaska Coastal Digital Elevation Model

browse graphicPerspective view of DEM
NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated bathymetric-topographic DEMs are used to support tsunami forecasting and modeling efforts at the NOAA Center for Tsunami Research, Pacific Marine Environmental Laboratory (PMEL). The DEMs are part of the tsunami forecast system SIFT (Short-term Inundation Forecasting for Tsunamis) currently being developed by PMEL for the NOAA Tsunami Warning Centers, and are used in the MOST (Method of Splitting Tsunami) model developed by PMEL to simulate tsunami generation, propagation, and inundation. 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 the vertical tidal datum of Mean High Water (MHW) and horizontal datum of World Geodetic System 1984 (WGS84). Grid spacings for the DEMs range from 1/3 arc-second (~10 meters) to 3 arc-seconds (~90 meters).
Cite this dataset when used as a source.
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Distribution Formats
  • ESRI Arc ASCII (Version: 1)
    • File Specification: ASCII text version of ESRI ArcGIS raster format
    • File Compression: WINZIP
Distributor Distributor information not available
Dataset No POCs available for this dataset
General Documentation
Associated Resources
Date(s)
  • publication: 2006-08-22
Edition: First
Data Presentation Form: mapDigital
Dataset Progress Status Complete
Data Update Frequency: As needed
Purpose: Developed for the Pacific Marine Environmental Laboratory (PMEL), NOAA Center for Tsunami Research program in support of NOAA's tsunami forecasting and warning efforts.
Originator(s)
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Publisher(s)
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Time Period: 1934-01-01 to 2004-01-01
Spatial Reference System:
Spatial Bounding Box Coordinates:
N: 54.35
S: 53.50
E: -165.90
W: -167.20
Spatial Coverage Map:
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
  • Earth Science > Land Surface > Topography > Topographical Relief Maps
  • Earth Science > Oceans > Coastal Processes > Coastal Elevation
Uncontrolled
  • Coastal Relief
  • Gridded elevations
  • Integrated bathymetry and topography
Platform keywords Global Change Master Directory (GCMD) Platform Keywords
  • 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
  • Dutch Harbor
  • Unalaska Island
  • Akutan Island
  • Aleutian Islands
Data Resolution keywords Global Change Master Directory (GCMD) Horizontal Data Resolution Keywords
  • H: 1 meter - < 30 meters
Global Change Master Directory (GCMD) Vertical Data Resolution Keywords
  • V: < 1 meter
Keywords
    Keywords
      Use Constraints No constraint information available
      Fees Fee information not available.
      Lineage information for: dataset
      Processing Steps
      • 2006-07-01T00:00:00 - All datasets obtained by NGDC were converted to common horizontal and vertical datums of WGS84 geographic and Mean High Water, respectively, using FME. They were also converted to common file format, ESRI point shapefiles, for visualization and inspection.
      • 2006-07-15T00:00:00 - Datasets were visually inspected with ArcGIS for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
      • 2006-07-22T00:00:00 - xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 3 arc-second grid that interpolated to fill empty cells. Points extracted every 30 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.
      • 2006-07-25T00:00:00 - NGDC multibeam swath sonar data were gridded at 1 arc-second using MB-System's 'mbgrid' tool; this pre-gridding permitted vertical datum conversion to MHW. The resulting Arc ASCII grid was converted to an Arc raster in ArcCatalog, then converted again to an ESRI shape file and shifted to MHW using FME. The resulting point data were consistent with overlapping NOS hydrographic soundings, though providing significantly greater seafloor resolution
      • 2006-08-01T00:00:00 - 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.
      • 2006-08-20T00:00:00 - The DEM was quantitatively evaluated by comparing with source datasets and with elevation values extracted from NGS geodetic monuments. It was visually evaluated by converting to UTM-zone coordinates (units of meters horizontally and vertically) and then 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 9.2.4.1420
      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 downloaded from web site. ; Source Type: online
        • Temporal extent used: 1934-01-01 to 1991-01-01
      • Electronic Navigational Charts
        • OCS Electronic Navigational Charts (download)
          Digital database of NOAA nautical chart information.
        • Description of Source: Source Contribution: downloaded from web site. ; Source Type: online
        • Temporal extent used: Unknown to
      • USGS NED topography
        • USGS National Elevation Dataset (download)
          Digital database of U.S. topography, in raster form (DEM)
        • Description of Source: Source Contribution: gridded topographic data downloaded from web site. ; Source Type: online
        • Temporal extent used: Unknown to
      • NGDC Multibeam Bathymetry Database
        • NGDC Multibeam Bathymetry Database (download)
          Multibeam swath sonar survey data
        • Description of Source: Source Contribution: multibeam swath sonar files downloaded from web site. ; Source Type: on web
        • Temporal extent used: 1988-01-01 to 2004-01-01
      • Shuttle Radar Topography Mission (SRTM)
        • Shuttle Radar Topography Mission (download)
          global topography
        • Description of Source: Source Contribution: gridded global topographic data downloaded from web site. ; Source Type: on web
        • Temporal extent used: Unknown to
      Acquisition Information (collection)
      Instrument
      Platform
      • Digital Elevation Model
      Operation
      • Tsunami Inundation Gridding Project
      Last Modified: 2016-03-11
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