San Juan Islands, Washington 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 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. The DEM is referenced to the vertical tidal datum of Mean High Water (MHW).
Cite this dataset when used as a source.
  • ID not available.
gov.noaa.ngdc.mgg.dem:1961
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 1883-01-01 to 2010-01-01
    Spatial Reference System urn:ogc:def:crs:EPSG::2927urn:ogc:def:datum:EPSG::5868
    Spatial Bounding Box Coordinates
    N: 48.86
    S: 48.25
    E: -122.60
    W: -123.33
    Spatial Coverage Map
    Associated Resources
    • NTHMP DEM Project
      • Bathymetric Data Viewer (search)
        The Bathymetric Data Viewer is an interactive map providing discovery, descriptions, and download capability for bathymetric survey data and digital elevation models archived at NOAA's National Centers for Environmental Information (NCEI).
    • Digital Elevation Models of the San Juan Islands Washington: Procedures, Data Sources, and Analysis
    Publication Dates
    • publication: 2011-12-23
    Edition First
    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
    • 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)
    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
    NASA/GCMD Platform Keywords
    • Models/Analyses > DEM > Digital Elevation Model
    Uncontrolled
    • Coastal Relief
    • Gridded elevations
    • Integrated bathymetry and topography
    Global Change Master Directory (GCMD) Service Keywords
    • DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS > WEB-BASED GEOGRAPHIC INFORMATION SYSTEMS
    • DATA MANAGEMENT/DATA HANDLING > DATA SEARCH AND RETRIEVAL
    • DATA ANALYSIS AND VISUALIZATION > VISUALIZATION/IMAGE PROCESSING
    Place keywords Global Change Master Directory (GCMD) Location Keywords
    • Continent > North America > United States of America > Washington
    • Ocean > Pacific Ocean > North Pacific Ocean
    • Vertical Location > Land Surface
    • Vertical Location > Sea Floor
    Uncontrolled
    • Port Townsend
    • Puget Sound
    • Juan De Fuca
    • San Juan Islands
    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
        • 2010-07-15T00:00:00 - All datasets obtained by NGDC were converted to common horizontal and vertical datums of NAD 83/WGS 84 geographic and NAVD 88, respectively, using FME or ArcGIS. They were also converted to common file format, ESRI point shapefiles or digital rasters, for visualization and inspection.
        • 2010-08-15T00:00:00 - Datasets were visually inspected with ArcGIS and QT Modeler for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
        • 2010-11-15T00:00:00 - 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 imported into ArcGIS and clipped to the coastline to remove values over land.
        • 2010-12-20T00:00:00 - 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.
        • 2011-01-20T00:00:00 - The DEM was quantitatively evaluated by converting to UTM-zone coordinates (units of meters horizontally and vertically) and then creating a slope grid to identify gridding artifacts in the DEM. A conversion grid was created using VDatum points to convert the NAVD 88 San Juan Islands DEM to MHW.
        Processing Environment Native Dataset Environment: Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.2.4.1420
        Source Datasets
        • NOS Hydrographic Surveys
          • NOS Hydrographic Survey Database (download)
            Digital database of NOS hydrographic surveys that date back to the late 19th century.
          • Description of Source: Source Contribution: hydrographic surveys
          • Temporal extent used: 1887-01-01 to 2006-01-01
        • CHS Gridded Multibeam
          • Multibeam Bathymetry
            Gridded Multibeam data
          • Description of Source: Source Contribution: Gridded multibeam files
          • Temporal extent used: 1996-01-01 to 2010-01-01
        • Puget Sound Lidar Consortium
          • PSLC lidar (download)
            PSLC topographic and bathymetric/topographic lidar data
          • Description of Source: Source Contribution: lidar data
          • Temporal extent used: 2001-01-01 to 2009-01-01
        • MLML Gridded Multibeam data
          • Moss Landing Marine Laboratory
            Moss Landing Marine Laboratory
          • Description of Source: Source Contribution: gridded multibeam data
          • Temporal extent used: 2001-01-01 to 2009-01-01
        • 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
          • Temporal extent used: 1999-01-01 to 2003-01-01
        • Composite Shoreline of the Continental United States Derived from NOAA-NOS Coastal Survey Maps
          • Composite Shoreline of the Continental United States Derived from NOAA-NOS Coastal Survey Maps (download)
            NOAA CSC compiled a vector shoreline using multi-temporal collection of NOAA coastal survey maps (T-sheets) ranging from 1901-1995. Where T-sheets were unavailable, NOAAs Extracted Vector Shoreline (EVS) was used to compile seamless shoreline coverage throughout the region.
          • Description of Source: Source Contribution: composite shoreline
          • Temporal extent used: 1901-01-01 to 1995-01-01
        • Washington State Marine Shorelines
          • Washington State Marine Shorelines (download)
            Washington marine (saltwater) shorelines including Puget Sound, Hood Canal, the Strait of Juan de Fuca, and the Pacific coastline. Also includes those portions of Washington's marine shorelines that are designated "Shorelines of State-wide Significance" by the Shoreline Management Act, Chapter 90.58
          • Description of Source: Source Contribution: shoreline
          • Temporal extent used: 2001-01-01 to 2002-01-01
        • 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
          • Temporal extent used: 2003-01-01 to 2008-01-01
        • VDatum software v. 2.2.7
          • VDatum (download)
            Vertical Datum Transformation tool
          • Description of Source: Source Contribution: vertical datum transformation tool
          • Temporal extent used: Unknown to
        • VDatum software v. 2.2.7
          • VDatum (download)
            Vertical Datum Transformation tool
          • Description of Source: Source Contribution: vertical datum transformation tool
          • Temporal extent used: Unknown to
        Acquisition Information (collection)
        Instrument
          Platform
          • Digital Elevation Model
          Operation
          • Tsunami Inundation Gridding Project
          Last Modified: 2017-11-13
          For questions about the information on this page, please email: dem.info@noaa.gov