Tutuila, American Samoa 1/3 arc-second MHW 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.
  • ID not available.
gov.noaa.ngdc.mgg.dem:4610
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Distribution Formats Format not available
    Distributor DEM Information
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    dem.info@noaa.gov
    Dataset Point of Contact DEM Information
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    dem.info@noaa.gov
    Time Period 1984-01-01 to 2012-01-01
    Spatial Reference System urn:ogc:def:crs:EPSG::4326urn:ogc:def:datum:EPSG::5868
    Spatial Bounding Box Coordinates
    N: -14.18
    S: -14.40
    E: -170.45
    W: -170.95
    Spatial Coverage Map
    General Documentation
    Associated Resources
    Publication Dates
    • publication: 2013-07-31
    Edition Second
    Data Presentation Form mapDigital
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency As needed
    Purpose Developed for the National Tsunami Hazard Mitigation Program in support of NOAA's tsunami forecasting and warning efforts.
    Use Limitations
    • Not to be used for navigation. Although these data are of high quality and useful for planning and modeling purposes, they are not suitable for navigation. For navigation, please refer to the NOS nautical chart series.
    • Produced by the NOAA National Geophysical Data Center. Not subject to copyright protection within the United States.
    Originators
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    • National Tsunami Hazard Mitigation Program (NTHMP)
    Custodians
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Publishers
    • 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
    Uncontrolled
    • Coastal Relief
    • Gridded elevations
    • Integrated bathymetry and topography
    Platform keywords Global Change Master Directory (GCMD) Platform Keywords
    • Models/Analyses > DEM > Digital Elevation Model
    Place keywords Global Change Master Directory (GCMD) Location Keywords
    • Ocean > 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
    • 1 meter - < 30 meters
    Global Change Master Directory (GCMD) Vertical Data Resolution Keywords
    • < 1 meter
    Keywords
      Keywords
        Use Constraints No constraint information available
        Access Constraints
        • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
        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: 2017-12-01
          For questions about the information on this page, please email: dem.info@noaa.gov