National Geophysical Data Center (NGDC), NOAA Satellite and Information Service

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

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
Search and Download
Distribution Formats
  • ESRI Arc ASCII (Version: 1)
    • File Compression: WINZIP
Distributor Distributor information not available
No point of contact available for this dataset
General Documentation
Associated Resources
  • NTHMP DEM Project
  • Digital Elevation Model of Tutuila, American Samoa: Procedures, Data Sources, and Analysis
  • 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 information not available.
  • publication: 2013-07-30
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.
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:
  • 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
  • DEM > Digital Elevation Model
  • H: 1 meter - < 30 meters
  • V: < 1 meter
  • Coastal Relief
  • Gridded elevations
  • Integrated bathymetry and topography
  • Continent > North America > United States of America > Pacific Ocean
  • Ocean > Pacific Ocean > North Pacific Ocean
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
  • Pago Pago
  • American Samoa
  • Pacific Ocean
  • Tutuila
Use Constraints No constraint information available
Fees Fee information not available.
Source Datasets
  • Bench Mark Data Sheet with Tidal Datum References
  • USGS NED topography
  • NGDC Multibeam Bathymetry Database
  • Electronic Navigational Chart (ENC) digital soundings
  • NOAA Mobile Lidar: American Samoa
  • 2012 NOAA American Samoa Lidar: Islands of Tutuila, Aunu'u, Ofu, Olosega, Ta'u and Rose Atoll
  • Mosaic of gridded multibeam bathymetry and bathymetry derived from multispectral IKONOS satellite imagery of Tutuila Island, American Samoa, USA
  • Bathymetric and topographic lidar of Pago Pago Harbor
  • Hydrographic sounding data of Auasi and Aunuu Harbors
Lineage Statement Lineage statement not available.
Processing Steps
  • 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.
  • Datasets were visually inspected with ArcGIS for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
  • 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.
  • 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.
  • 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

Metadata Last Modified: 2015-09-03

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