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Oahu, Hawaii 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: ZIP
Distributor Distributor information not available
Dataset No POCs available for this dataset
General Documentation
Associated Resources
  • publication: 2011-10-01
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.
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Time Period: 2005-01-01 to 2011-01-01
Spatial Reference System:
Spatial Bounding Box Coordinates:
N: 22.06
S: 21.02
E: -157.4
W: -158.45
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
  • 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
  • Ocean > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
  • Oahu
  • Oahu
  • Hawaii
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
      Use Constraints No constraint information available
      Fees Fee information not available.
      Lineage information for: dataset
      Processing Steps
      • 2011-09-02T00:00:00 - All datasets obtained by NGDC were converted to common horizontal and vertical datums of WGS84 geographic and Mean High Water, respectively, using constant offsets. They were also converted to common file format, ascii xyz files, for visualization and inspection.
      • 2011-09-02T00:00:00 - Datasets were visually inspected with ArcGIS for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
      • 2011-09-06T00:00:00 - Multibeam surveys were gridded to 1 arc-second spacing (~10 meters) using MB-System's 'mbgrid' tool.
      • 2011-09-12T00:00:00 - 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 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 clipped to the coastline using GDAL to remove values over land.
      • 2011-09-15T00:00:00 - 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. 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.
      • 2011-09-20T00:00:00 - 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 projected coordinates (units of meters horizontally and vertically) and then creating a slope grid to identify gridding artifacts in the DEM.
      Source Datasets
      • Electronic Navigational Charts and Raster Nautical Charts
      • NGDC Multibeam Bathymetry Database
        • NGDC Multibeam Bathymetry Database (download)
          Multibeam swath sonar survey data
        • Description of Source: Source Contribution: multibeam swath sonar surveys ; Source Type: online
        • Temporal extent used: 1987-01-01 to 2009-01-01
      • Bench Mark Data Sheets with Tidal Datum References
        • Tides and Currents Station Selection (download)
          Bench Mark Data Sheets
        • Description of Source: Source Contribution: tidal information table from which vertical datum adjustment information are interpreted ; Source Type: online
        • Temporal extent used: 2006-01-01 to 2007-01-01
      Acquisition Information (collection)
      • Digital Elevation Model
      • Tsunami Inundation Gridding Project
      Last Modified: 2016-03-11
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