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Garibaldi, Oregon 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 warning 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 a variety of vertical datums and horizontal datum of World Geodetic System of 1984 (WGS84). Cell size for the DEMs ranges from 1/3 arc-second (~10 meters) to 3 arc-seconds (~90 meters).

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Distribution Formats
  • ESRI Arc ASCII (Version: 2)
    • File Compression: WINZIP
Distributor Distributor information not available
No point of contact available for this dataset
General Documentation
Associated Resources
  • NOAA Tsunami Inundation Gridding Project
  • Digital Elevation Models of Garibaldi, Oregon: Data Sources, Processing and Evaluation
  • 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
  • publication: 2013-01-14
Edition: Second
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.
Time Period: 1877-01-01  to  2012-01-01
Spatial Reference System:
Spatial Bounding Box Coordinates:
N: 45.90
S: 45.10
E: -123.70
W: -124.50
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 > Oregon
  • Ocean > Pacific Ocean > North Pacific Ocean
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
  • Garibaldi
  • Tillamook Bay
  • Oregon
Use Constraints No constraint information available
Fees Fee information not available.
Source Datasets
  • NOS Hydrographic Surveys
  • NOAA NOS High-Resolution Multibeam Bathymetry Surveys (BAG)
  • OSU Multibeam Bathymetry
  • USACE JALBTCX Topo-Bathy Lidar
  • DOGAMI Topographic Lidar (North Coast and Yambo Study Area)
  • ODF Topographic Lidar
  • USGS NED topography
  • VDatum software v3.0
Lineage Statement Lineage statement not available.
Processing Steps
  • All datasets obtained by NGDC were converted to a common ASCII XYZ file format. Additionally, common horizontal and vertical datums of WGS84 geographic and the North American Vertical Datum of 1988 (NAVD88) were established using the Proj4 Cartographic Projections Library and transformation grids derived from NOAA VDatum software.
  • The data were visually inspected with Fledermaus and ArcGIS for identification and editing of data anomalies. Datasets were compared with overlapping datasets to ensure data consistency. In some cases, overlapping data were edited to ensure a smooth transition between adjacent datasets.
  • A 1/3 arc-second bathymetric 'pre-surface' was created using GMT's 'surface' tool in order to interpolate or extrapolate values where data coverage was sparse or non-existent. In order to ensure realistic inter/extrapolated values, two such grids were created, one for the 'open ocean' coast and another for bays/estuaries. Different upper limits (of depths) were imposed for each grid created. The final mosaiced grid was clipped to the shoreline to remove depths over land. The grid was then converted to an ASCII XYZ file to serve as an input in the final integrated topo-bathy surface.
  • ASCII 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 reviewed qualitatively for any noticeable artifacts introduced during the gridding process using imagery and other ancillary data. The DEM was also quantitatively evaluated by comparing it with source datasets and with elevation values extracted from NGS geodetic monuments.
  • The NAVD88 DEM was transformed vertically to Mean High Water using a conversion grid derived from NOAA VDatum software.

Metadata Last Modified: 2015-09-03

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