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Tutuila, American Samoa 1/3 arc-second Coastal Digital Elevation Model

browse graphicHillshade 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 individual coastal States as part of the National Tsunami Hazard Mitigation Program's (NTHMP) efforts to improve community preparedness and hazard mitigation. Bathymetric, topographic, and shoreline data used in DEM compilation are obtained from various sources including: NGDC; the U.S. Geological Survey (USGS); Naval Oceanographic Office (NAVOCEANO); NOAA's Coastal Service Center; 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 geographic (WGS 84). Grid spacing for the DEM is 1/3 arc-second (~10 meters).
Cite this dataset when used as a source.
Dataset Information
Download Data
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: 2013-07-31
Edition: Second
Data Presentation Form: mapDigital
Dataset Progress Status Complete
Data Update Frequency: As needed
Purpose: Developed for the National Tsunami Hazard Mitigation Program in support of NOAA's tsunami forecasting and warning efforts.
Originator(s)
  • 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(s)
    Publisher information not available.
Time Period: 1984-01-01 to 2012-01-01
Spatial Reference System:
Spatial Bounding Box Coordinates:
N: -14.18
S: -14.40
E: -170.45
W: -170.95
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 > Pacific Ocean
  • Ocean > Pacific Ocean > North Pacific Ocean
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
South Pacific
  • Pago Pago
  • American Samoa
  • Pacific Ocean
  • Tutuila
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
      • 2012-11-09T00:00:00 - All datasets obtained by NGDC were converted to common horizontal and vertical datums of WGS 84 geographic and Mean 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.
      • 2013-01-23T00:00:00 - Datasets were visually inspected with ArcGIS for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
      • 2013-02-13T00:00:00 - xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 1 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 imported into ArcGIS and clipped to the coastline to remove values over land.
      • 2013-07-19T00:00:00 - 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.
      • 2013-07-24T00:00:00 - 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 9.2.4.1420
      Source Datasets
      • Bench Mark Data Sheet with Tidal Datum References
        • Tides and Currents Station Selection
          Bench Mark Data Sheet for station #1770000
        • Description of Source: Tidal information table from which vertical datum adjustment information are interpreted
        • Temporal extent used: 1983-01-01 to 2001-12-01
      • USGS NED topography
        • USGS National Elevation Dataset (download)
          Digital database of U.S. topography, in raster form (DEM)
        • Description of Source: Source Contribution: topographic DEM ; Source Type: on web
        • 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 bathymetry data ; Source Type: online
        • Temporal extent used: 1996-01-01 to 2005-01-01
      • Electronic Navigational Chart (ENC) digital soundings
      • NOAA Mobile Lidar: American Samoa
        • NOAA's Ocean Service (NOS), Coastal Services Center (CSC) (download)
          NOAA's Ocean Service (NOS), Coastal Services Center (CSC)
        • Description of Source: Source Contribution: Topographic mobile lidar DEMs for select American Samoa communites
        • Temporal extent used: 2011-08-12 to 2011-08-20
      • 2012 NOAA American Samoa Lidar: Islands of Tutuila, Aunu'u, Ofu, Olosega, Ta'u and Rose Atoll
      • Bathymetric and topographic lidar of Pago Pago Harbor
        • Bathymetric and topographic lidar of Pago Pago Harbor (download)
          NAVOCEANO conducted a bathymetric and topographic lidar survey of Pago Pago Harbor in 2006. Topographic elevations were not processed to bare-earth
        • Description of Source: Source Contribution: Bathymetric-topographic lidar ; Source Type: provided by NAVOCEANO
        • Temporal extent used: Unknown to
      • Hydrographic sounding data of Auasi and Aunuu Harbors
        • Condition survey data of Auasi and Aunuu Harbors (download)
          Hydrographic Sounding at intervals, along Project design lines spaced at specific intervals.
        • Description of Source: Source Contribution: hydrographic sounding data
        • Temporal extent used: Unknown to
      Acquisition Information (collection)
      Instrument
      Platform
      • Digital Elevation Model
      Operation
      • NTHMP DEM Gridding Project
      Last Modified: 2016-03-11
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