Nikolski, Alaska 1/3 arc-second MHHW Coastal Digital Elevation Model

NOAA's National Geophysical Data Center (NGDC) 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).
Cite this dataset when used as a source.
  • ID not available.
gov.noaa.ngdc.mgg.dem:11521
Download Data
Distribution Formats
  • netCDF (Version: 4 Classic)
Distributor Distributor information not available
Dataset No POCs available for this dataset
Time Period 1937-01-01 to 2014-04-11
Spatial Bounding Box Coordinates
N: 53.02
S: 52.89
E: -168.73
W: -168.98
Spatial Coverage Map
General Documentation
Associated Resources
Publication Dates
  • publication: 2014-07-24
Edition Second
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.
Originators
  • 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
Collaborators
  • 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 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
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
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 >California
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
NASA/GCMD Location Keywords
  • Continent > North America > United States of America > Alaska
  • Ocean > Pacific Ocean > North Pacific Ocean
  • Ocean > Pacific Ocean > North Pacific Ocean > Aleutian Islands
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
Uncontrolled
  • Nikolski
  • Umnak Island
  • Mt. Vsevidof
  • Aleutian Islands
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
  • 2014-06-06T00:00:00 - All datasets obtained by NGDC were converted to common horizontal and vertical datums of WGS84 geographic and Mean Higher High Water, respectively, using FME. They were also converted to common file format, ESRI point shapefiles, for visualization and inspection.
  • 2014-06-14T00:00:00 - Datasets were visually inspected with ArcGIS for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
  • 2014-06-24T00:00:00 - 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.
  • 2014-06-24T00:00:00 - 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.
  • 2014-07-10T00:00:00 - The DEM was qualitatively 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. Comparisons to source data sets were also used to assess quality of gridding.
Processing Environment Native Dataset Environment: Microsoft Windows 7 Professional Service pack 1 (Build 3790); ESRI ArcCatalog 10.2
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 ; Source Type: online
    • Temporal extent used: 1910-01-01 to 1940-01-01
  • NGDC Multibeam Bathymetry Database
    • NGDC Multibeam Bathymetry Database (download)
      Multibeam swath sonar survey data
    • Description of Source: Source Contribution: downloaded from web site. ; Source Type: online
    • Temporal extent used: 1988-01-01 to 2005-01-01
  • Shuttle Radar Topography Mission (SRTM)
    • Shuttle Radar Topography Mission (download)
      global topography
    • Description of Source: Source Contribution: gridded topographic data downloaded from web site. ; Source Type: on web
    • Temporal extent used: Unknown to
  • ETOPO1 1 Arc-Minute Global Relief Model
    • ETOPO1 Global Relief Model (download)
      global relief model integrating bathymetric and topographic datasets
    • Description of Source: Source Contribution: DEM downloaded from web site. ; Source Type: on web
    • Temporal extent used: Unknown to
  • 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 ; Source Type: on web
    • Temporal extent used: Unknown to
  • ASTER topography
    • METI/NASA ASTER Topographic DEM (download)
      Digital database of World topography, in raster form (DEM)
    • Description of Source: Source Contribution: topographic DEM ; Source Type: on web
    • Temporal extent used: Unknown to
  • GPS Elevation points
    • GPS Elevation points (download)
      .
    • Description of Source: Source Contribution: GPS Survey data from UAF; Source Type: online
    • Temporal extent used: 1910-01-01 to 1940-01-01
  • DTM survey data
    • DTM survey data (download)
      AutoCAD survey data
    • Description of Source: Source Contribution: Nikolski DTM Survey Data ; Source Type: online
    • Temporal extent used: 1988-01-01 to 2005-01-01
Acquisition Information (collection)
Instrument
    Platform
    • Digital Elevation Model
    Operation
    • NTHMP DEM Gridding Project
    Last Modified: 2017-10-17
    For questions about the information on this page, please email: