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Sand Point, Alaska 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 tsunami forecasting and warning efforts at the NOAA Center for Tsunami Research, Pacific Marine Environmental Laboratory (PMEL). The DEMs are part of the tsunami forecast system SIFT (Short-term Inundation Forecasting for Tsunamis) currently
being developed by PMEL for the NOAA Tsunami Warning Centers, and are used in the MOST (Method of Splitting Tsunami) model developed by PMEL to simulate tsunami generation, propagation, and inundation. 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 the vertical tidal datum of Mean High Water (MHW) and horizontal datum of World Geodetic System 1984 (WGS84). Grid spacings for the DEMs range from 1/3 arc-second (~10 meters) to 3 arc-seconds (~90 meters).
Cite this dataset when used as a source.
  • ID not available.
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).
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: 1913-01-01 to 2006-01-01
    Spatial Reference System: urn:ogc:def:crs:EPSG::4326urn:ogc:def:datum:EPSG::5868
    Spatial Bounding Box Coordinates:
    N: 55.70
    S: 54.70
    E: -159.80
    W: -161.00
    Associated Resources
    • NOAA Tsunami Inundation Gridding 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).
      • DEM text search (search)
        Text search for locating completed and planned DEMs.
    • Digital Elevation Models of Sand Point, Alaska: Procedures, Data Sources, and Analysis
    Date(s)
    • publication: 2006-09-29
    Edition: First
    Data Presentation Form: mapDigital
    Dataset Progress Status Complete
    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 Geophysical Data Center. Not subject to copyright protection within the United States.
    Originator(s)
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Publisher(s)
    • 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
    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
    • 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
    NASA/GCMD Data Resolution Keywords
    • 1 meter - < 90 meters
    • < 1 meter
    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
    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
    Place keywords Global Change Master Directory (GCMD) Location Keywords
    • Continent > North America > United States of America > Alaska
    • Ocean > Pacific Ocean > North Pacific Ocean > Gulf of Alaska
    • Vertical Location > Land Surface
    • Vertical Location > Sea Floor
    Uncontrolled
    • Sand Point
    • Alaska Peninsula
    • Unga Island
    • Aleutian Islands
    Project keywords Global Change Master Directory (GCMD) Project Keywords
    • ICSU-WDS > International Council for Science - World Data System
    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: 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.
    Lineage information for: dataset
    Processor
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Processing Steps
    • 2006-08-01T00:00:00 - All datasets obtained by NGDC were converted to common horizontal and vertical datums of WGS84 geographic and Mean High Water, respectively, using FME. They were also converted to common file format, ESRI point shapefiles, for visualization and inspection.
    • 2006-08-15T00:00:00 - Datasets were visually inspected with ArcGIS for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
    • 2006-08-22T00:00:00 - xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 1 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.
    • 2006-08-31T00:00:00 - xyz files for each dataset were combined into a single file, which was smoothed using GMT's 'blockmedian' tool to a 3 arc-second grid 5% larger than the final 3 arc-second DEM. GMT's 'surface' tool then applied a tight spline tension to interpolate cells without data values.
    • 2006-08-24T00:00:00 - The DEM was quantitatively evaluated by comparing with source datasets and with elevation values extracted from NGS geodetic monuments. It was visually 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. It was also compared to 1/3 arc-second DEM to ensure elevation consistency.
    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 downloaded from web site. ; Source Type: online
      • Temporal extent used: 1913-01-01 to 1955-01-01
    • NOS unpublished hydrographic LiDAR Surveys
      • Description of Source: Source Contribution: coastal bathymetric-topographic LiDAR surveys provided by NOS Pacific Hydrographic Branch. ; Source Type: digital file
      • Temporal extent used: 2003-01-01 to 2005-01-01
    • NOS Unpublished Multibeam Swath Sonar Surveys
      • Description of Source: Source Contribution: Multibeam bathymetric surveys provided by NOS Pacific Hydrographic Branch. ; Source Type: digital file
      • 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: gridded topographic data ; Source Type: online
      • Temporal extent used: Unknown to
    • 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: online
      • Temporal extent used: Unknown to
    • Measured and Estimated Seafloor Topography
      • Measured and Estimated Seafloor Topography (download)
        global digital gridded data
      • Description of Source: Source Contribution: global gridded DEM downloaded from web site. ; Source Type: online
      • 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