Larsen Bay, Alaska 8/15 arc-second MHHW Coastal Digital Elevation Model

NOAA's National Centers for Environmental Information is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the National Tsunami Hazard Mitigation Program's (NTHMP) efforts to improve community preparedness and hazard mitigation. These integrated bathymetric-topographic DEMs are used to support tsunami and coastal inundation mapping. 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 various vertical and horizontal datums depending on the specific modeling requirements of each State. For specific datum information on each DEM, refer to the appropriate DEM documentation. Cell sizes also vary depending on the specification required by modelers in each State, but typically range from 8/15 arc-second (~16 meters) to 8 arc-seconds (~240 meters).
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Distribution Formats
  • netCDF (Version: 4 Classic)
Distributor Distributor information not available
Dataset No POCs available for this dataset
Coverage Description ISO valid extents for Larsen Bay 8/15 sec. DEM
Time Period
Spatial Bounding Box Coordinates
N: 57.59
S: 57.51
E: -153.90
W: -154.15
Spatial Coverage Map
General Documentation
Associated Resources
Publication Dates
  • publication: 2016-09-29
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 University of Alaska at Fairbanks (UAF), Geophysical Institute for tsunami and coastal inundation modeling efforts for the State of Alaska.
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.
  • 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)
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Theme keywords Global Change Master Directory (GCMD) Science and Services 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 > Topographical Relief Maps
  • Earth Science > Oceans > Coastal Processes > Coastal Elevation
  • Coastal Relief
  • Gridded elevations
  • Integrated bathymetry and topography
Global Change Master Directory (GCMD) Service Keywords
Platform keywords Global Change Master Directory (GCMD) Platform Keywords
  • Models/Analyses > DEM > Digital Elevation Model
Place keywords Global Change Master Directory (GCMD) Location Keywords
  • Continent > North America > United States of America >Alaska
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
  • Larsen Bay
  • Kodiak Island
  • Alaska
  • Uyak Bay
Project keywords
  • ICSU-WDS > International Council for Science - World Data System
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
    Use Constraints No constraint information available
    Fees Fee information not available.
    Lineage information for: dataset
    Processing Steps
    • 2016-08-26T00:00:00 - All datasets obtained by NCEI were converted to common horizontal and vertical datums of WGS 84 geographic and Mean Higher High Water, respectively, based on tide station information. They were also converted to common file format, ESRI point shapefiles, for visualization and inspection.
    • 2016-09-05T00:00:00 - Datasets were visually inspected with ArcGIS and Global Mapper for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
    • 2016-09-12T00:00:00 - xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 8/15 arc-second grid that interpolated to fill empty cells. Points extracted every 5 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.
    • 2016-09-19T00:00:00 - 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.
    • 2016-09-25T00:00:00 - The DEM was quantitatively evaluated by comparing with source datasets.
    Processing Environment Native Dataset Environment: Microsoft Windows 7 Enterprise; ESRI ArcGIS
    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: NOS hydrographic survey data
      • Temporal extent used: 2000-05-14 to 2000-07-20
    • Bench Mark Data Sheet with Tidal Datum References
      • Tides and Currents Station Selection
        Bench Mark Data Sheet for station # 9457724
      • Description of Source: Tidal information table from which vertical datum adjustment information are interpreted
      • Temporal extent used: 2009-08-01 to 2009-09-01
    • ArcticDEM - Mosaic files Version 1
      • ArcticDEM (download)
        ArcticDEM is an NGA-NSF public-private initiative to automatically produce a high-resolution, high quality, digital surface model (DSM) of the Arctic using optical stereo imagery, high-performance computing, and open source photogrammetry software. Geospatial support for this work provided by the Polar Geospatial Center under NSF PLR awards 1043681 and 1559691. DEMs provided by the Polar Geospatial Center under NSF PLR awards 1043681, 1559691, and 1542736
      • Description of Source: Optically Derived Digital Surface Model (DSM)
      • Temporal extent used: Unknown to
    • UAF Larsen Bay GPS
      • DCRA CAD ortho photo derived topography
        Acquisition Information (collection)
          • Digital Elevation Model
          • NTHMP DEM Gridding Project
          Last Modified: 2017-11-28
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