Wrangell, Alaska 8/15 arc-second Coastal Digital Elevation Model

NOAA's National Centers for Environmental Information (NCEI) 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.
Other Access
Distribution Formats
  • NetCDF (Version: 1)
    • File Specification: NetCDF
Distributor DEM Information
NOAA National Centers for Environmental Information
Dataset Point of Contact DEM Information
NOAA National Centers for Environmental Information
Time Period 1954-01-01 to 2017-01-01
Spatial Reference System urn:ogc:def:crs:EPSG::4326MHHW
Spatial Bounding Box Coordinates
N: 56.3
S: 56.5000000025
E: -132.309999999
W: -132.43
Spatial Coverage Map
Associated Resources
Publication Dates
  • publication: 2018-11-19
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 Centers for Environmental Information. Not subject to copyright protection within the United States.
  • NOAA National Centers for Environmental Information
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
  • National Tsunami Hazard Mitigation Program (NTHMP)
  • NOAA National Centers for Environmental Information
Theme keywords NASA/GCMD Earth 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 > Topographical Relief Maps
  • Earth Science > Oceans > Coastal Processes > Coastal Elevation
NASA/GCMD Platform Keywords
  • DEM > Digital Elevation Model
NASA/GCMD Data Resolution Keywords
  • H: 1 meter - < 30 meters
  • V: < 1 meter
  • Coastal Relief
  • Gridded elevations
  • Integrated bathymetry and topography
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
Place keywords NASA/GCMD Location Keywords
  • Continent > North America > United States of America > Alaska
  • Ocean > Pacific Ocean > North Pacific Ocean
  • Vertical Location > Land Surface
  • Vertical Location > Sea Floor
North Pacific
  • Wrangell
  • Wrangell Island
  • Zimovia Strait
  • Alaska
Project keywords Global Change Master Directory (GCMD) Project Keywords
  • ICSU-WDS > International Council for Science - World Data System
Use Constraints No constraint information available
  • No Charge
Lineage information for: dataset
  • NOAA National Centers for Environmental Information
Processing Steps
  • 2018-09-19T00:00:00 - 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.
  • 2018-10-11T00:00:00 - 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.
  • 2018-10-15T00:00:00 - 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 2 meters along the coastline were also included to ensure that the bathymetric grid reached zero at the coast. The resulting grid was clipped to the coastline to remove values over land.
  • 2018-11-09T00:00:00 - 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.
  • 2018-11-16T00:00:00 - The DEM was quantitatively evaluated by comparing with source datasets.
Processing Environment Version 6.2 (Build 9200) ; Esri ArcGIS
Source Datasets
  • Electronic Navigational Chart (ENC) digital soundings and depth contours charts US5AK3NM and US5AK08M
  • Harbor condition survey for Wrangell Harbor and Heritage Harbor
  • 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: 1954-01-01 to 2015-01-01
  • Bench Mark Data Sheet with Tidal Datum References
    • Tides and Currents Station Selection
      Bench Mark Data Sheet for station # 9451054 and # 9451204
    • Description of Source: Tidal information table from which vertical datum adjustment information are interpreted
    • Temporal extent used: 2001-04-01 to 2017-05-01
  • Ifsar DTM
    • Elevation Datasets of Alaska (download)
      This interactive map displays known public-domain elevation datasets in Alaska.
    • Description of Source: Interferometric Synthetic Aperture Radar Data (Ifsar) DTM
    • Temporal extent used: 2012-08-14 to 2012-09-08
  • UAF Port Alexander and Wrangell GPS
    • Description of Source: GPS survey data obtained from UAF
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)
  • Digital Elevation Model
  • NTHMP DEM Gridding Project
Last Modified: 2020-01-16
For questions about the information on this page, please email: dem.info@noaa.gov