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Bermuda 3 arc-second Coastal Digital Elevation Model

browse graphicThumbnail of DEM
The 3 arc-second Bermuda DEM will be used to support NOAA's tsunami forecast system and for tsunami inundation modeling. This DEM encompasses the islands of Bermuda and the adjacent off-shore areas.
Cite this dataset when used as a source.
  • ID not available.
gov.noaa.ngdc.mgg.dem:5011
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Search Data
  • DEM text search (search)
    Text search for locating completed and planned DEMs.
  • 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).
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Distribution Formats
  • netCDF(Version:4 Classic)
Distributor DEM Information
NOAA National Centers for Environmental Information
dem.info@noaa.gov
Dataset Point of Contact DEM Information
NOAA National Centers for Environmental Information
dem.info@noaa.gov
Time Period 1993-01-01 to 2012-12-31
Spatial Reference System urn:ogc:def:crs:EPSG::4326urn:ogc:def:crs:EPSG::5715
Spatial Bounding Box Coordinates
West:-65.50
East:-64.00
South:31.50
North:33.00
Spatial Coverage Map
General Documentation
Associated Resources
Publication Dates
  • publication: 2013-11-20
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 Pacific Marine Environmental Laboratory (PMEL), NOAA Center for Tsunami Research 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 Centers for Environmental Information. Not subject to copyright protection within the United States.
Originators
  • NOAA National Centers for Environmental Information
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Custodians
  • NOAA National Centers for Environmental Information
Publishers
  • NOAA National Centers for Environmental Information
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
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
Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
  • 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
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 > Atlantic Ocean > North Atlantic Ocean > Bermuda
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
Uncontrolled
  • Bermuda
  • Atlantic Ocean
Project keywords Global Change Master Directory (GCMD) Project Keywords
  • ICSU-WDS > International Council for Science - World Data System
  • NOAA OneStop Project
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 - < 10 meters
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
Processor
  • NOAA National Centers for Environmental Information
Processing Steps
  • 2013-11-01T00:00:00 -All data obtained by NGDC were converted to a common horizontal reference frame (WGS84) using the Proj4 Cartographic Projections Library. All bathymetry data were converted to MSL using single values offsets between various tidal datums based on information obtained from the Government of Bermuda, Ministry of Environment and Planning. The topographic data were left referenced to Bermuda Ordinance Datum (OD); the offset between MSL and the OD is approximately 0.9m. It was assumed the magnitude of this difference was less than the vertical accuracy associated with the data and spatial resolution of the grids.
  • 2013-11-01T00:00:00 -Datasets were visually inspected with ArcGIS, QT Modeler and MB-System for identification and editing of data anomalies, including but not limited to inconsistencies between overlapping or adjacent datasets, 'noisy' data, etc.
  • 2013-11-01T00:00:00 -All data were converted to UTF-8 XYZ files. A 1 arc-second bathymetric 'pre-surface' grid was generated using a tensioned spline algorithm within GMT's 'surface' utility that interpolated depth values to areas where data were sparse and/or nonexistent. The bathymetric 'pre-surface' was then imported into ArcGIS and clipped to the coastline of Bermuda to remove values over land. The clipped 'pre-surface' was then converted to UTF-8 XYZ point data.
  • 2013-11-01T00:00:00 -The final integrated 1 arc-second topo-bathy DEM was created using GMT's 'blockmedian' and 'surface' utilities. The topographic spot heights and bathymetric surface points were used as source datasets in the spline gridding algorithm. This raster was then converted to points for use as input in creation of the larger footprint, lower resolution 3 arc-second DEM.
  • 2013-11-01T00:00:00 -Using the points from the converted 1 arc-second DEM as well as bathymetric data outside the extent of the 1 arc-second grid, an integrated 3 arc-second DEM was created using MB-System's 'mbgrid' utility. Like the GMT 'surface' utility, it uses a tensioned spline gridding algorithm to interpolate depths where necessary. However, it also allows the user to define the relative weighting of each input dataset for consideration during the gridding process. Generally speaking, preferential weighting was given to more recent, higher-accuracy datasets.
  • 2013-11-01T00:00:00 -The 3 arc-second DEM was qualitatively evaluated to identify any artifacts that may have been introduced during the gridding process. If necessary, the data were edited and the gridding routine was re-run. Once the DEM was deemed suitable, it was compared to nautical charts to ensure data consistency.
Source Datasets
  • Data table with established relationships between various vertical datums
    • Description of Source: Absolute Differences Between Hydrographic and Topographic Datums
    • Time Instant: 2010-05-01T00:00:00
  • Sounding depths digitized from various Admiralty Charts of Bermuda
    • Description of Source: Source Contribution: Nautical chart derived sounding depths
    • Temporal extent used: 1993-01-01 to 1997-12-31
  • Bathymetric lidar of Bermuda, South Coast
    • Description of Source: Source Contribution: Bathymetric lidar
    • Time Instant: 2004-01-01
  • Multibeam derived ESRI grids (2m horizontal resolution)
    • CSUMB Seafloor Mapping Lab homepage (download)
      CSUMB Seafloor Mapping Lab homepage
    • Description of Source: Source Contribution: Gridded multibeam bathymetry
    • Time Instant: 2009-01-01
  • NGDC Multibeam Bathymetry Database
    • NGDC Multibeam Bathymetry Database (download)
      Multibeam swath sonar survey data
    • Description of Source: Source Contribution: Multibeam bathymetry data
    • Temporal extent used: 1993-01-01 to 2012-12-31
  • Generalized Bathymetric Chart of the Oceans 30 arc-second grid (2008)
    • GEBCO organizational website (download)
      GEBCO organizational website with links to general information webpages and data access
    • Description of Source: Source Contribution: GEBCO08 Global Bathymetric Model
    • Time Instant: 2008-01-01
  • Topographic spot elevations of Bermuda
    • Description of Source: Source Contribution: Topographic surveyed spot elevations
    • Time Instant: 2013-01-01
Lineage information for:repository
Processing Steps
  • 2015-04-22T00:00:00 -NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
Acquisition Information (collection)
Instrument
    Platform
    • Digital Elevation Model
    Last Modified: 2022-03-25
    For questions about the information on this page, please email:dem.info@noaa.gov