Seamless topo-bathy digital elevation model (DEM) of Arey Lagoon, Alaska

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Frequently anticipated questions:

What does this data set describe?

Title:
Seamless topo-bathy digital elevation model (DEM) of Arey Lagoon, Alaska
Abstract:
A seamless topographic-bathymetric digital elevation model for an area around Arey Lagoon, Alaska created from a combination of lidar elevation data collected in 2009, single-beam bathymetric data collected in 2011, and NOS sounding data collected in 1948.
Supplemental_Information:
Additional information about the field activity from which these data were derived is available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=ID411AR Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Erikson, Li H., Gibbs, Ann E., Richmond, Bruce M., Jones, Benjamin M., Storlazzi, Curt D., and Ohman, Karin A., 20201207, Seamless topo-bathy digital elevation model (DEM) of Arey Lagoon, Alaska: data release DOI:10.5066/P9LGYO2Q, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Erikson, Li H., Gibbs, Ann E., Richmond, Bruce M., Jones, Benjamin M., Storlazzi, Curt D., and Ohman, Karin A., 2020, Modeled 21st century storm surge, waves, and coastal flood hazards, and supporting oceanographic and geological field data (2010 and 2011) for Arey and Barter Islands, Alaska and vicinity: data release DOI:10.5066/P9LGYO2Q, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -144.191068
    East_Bounding_Coordinate: -143.657291
    North_Bounding_Coordinate: 70.173928
    South_Bounding_Coordinate: 70.014645
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/5eea6bd482ce3bd58d856683?name=BTI_AreyLagoonDigitalElevationModel.jpg&allowOpen=true (jpg)
    Color image of Arey Lagoon digital elevation model.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 01-Jan-1948
    Ending_Date: 11-Jul-2011
    Currentness_Reference:
    ground condition at time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Raster Digital Data Set (geoTIFF)
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 3370 x 3900, type Pixel
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 7
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -141.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 5
      Ordinates (y-coordinates) are specified to the nearest 5
      Planar coordinates are specified in meters
      The horizontal datum used is GCS_WGS_1984.
      The ellipsoid used is D_WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257223563.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: Mean Sea Level
      Altitude_Resolution: 0.01
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    Digital elevation model (DEM) in raster format. Pixel value represents elevation/depth relative to approximate mean sea level.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Li H. Erikson
    • Ann E. Gibbs
    • Bruce M. Richmond
    • Benjamin M. Jones
    • Curt D. Storlazzi
    • Karin A. Ohman
  2. Who also contributed to the data set?
    Arctic Landscape Conservation Cooperative (ALCC), U.S. Fish & Wildlife Service
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

Data were generated as a foundation data set for modeling estimated future ocean storm conditions (magnitude and frequency), coastal flooding potentials, and barrier island migration rates, for the 21st century and assess changes with respect to past conditions.

How was the data set created?

  1. From what previous works were the data drawn?
    lidar (source 1 of 3)
    U.S. Geological Survey, 2015, 2009 USGS Lidar: North Slope, Alaska: NOAA Digital Coast, online.

    Online Links:

    Type_of_Source_Media: Digital Resources
    Source_Contribution:
    Lidar data were used as the source of terrestrial elevation in the digital elevation model.
    single-beam bathymetry (source 2 of 3)
    U.S. Geological Survey, 2020, Single-beam bathymetry data collected in 2011 in the vicinity of Arey Lagoon and Barter Islands, Alaska: U.S. Geological Survey, online.

    Online Links:

    Type_of_Source_Media: Digital Resources
    Source_Contribution:
    Single-beam bathymetry data were used as the source of seabed elevation in the digital elevation model.
    NOS soundings (source 3 of 3)
    DOC/NOAA/NOS/OCS/HSD. Hydrographic Surveys Division, Office of Coast Survey, National Ocean Service, NOAA, U.S. Department of Commerce, 1948, NOAA/NOS Sounding Data: NOAA National Centers for Environmental Information, online.

    Online Links:

    Type_of_Source_Media: Digital Resources
    Source_Contribution:
    NOS soundings were used as a source of seabed elevation in the digital elevation model.
  2. How were the data generated, processed, and modified?
    Date: 2011 (process 1 of 2)
    Lidar data points (relative to the GRS80 ellipsoid) were shifted vertically upward by 2.3 m to an approximate Mean Sea Level vertical. Adjusted lidar points, single-beam bathymetry, and NOS soundings data were combined and gridded to a 5-m resolution using Delaunay triangulation in Deltares Quickin software. Data sources used in this process:
    • lidar
    • single-beam bathymetry
    • NOS Soundings
    Date: 13-Oct-2021 (process 2 of 2)
    Performed minor edits to the metadata to correct typos. No data were changed Person who carried out this activity:
    U.S. Geological Survey
    Attn: Susan A. Cochran
    Geologist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7545 (voice)
    scochran@usgs.gov
  3. What similar or related data should the user be aware of?
    Erikson, Li H., Gibbs, Ann E., Richmond, Bruce M., Storlazzi, Curt D., Jones, Benjamin M., and Ohman, Karin A., 2020, Changing Storm Conditions in Response to Projected 21st Century Climate Change Scenarios and the Potential Impact on an Arctic Barrier Island Lagoon System: A Pilot Study for Arey Island and Lagoon, Eastern Arctic Alaska.

    Online Links:

    Other_Citation_Details:
    Erikson, L.H., Gibbs, A.E., Richmond, B.M., Storlazzi, C.D., Jones, B.M., and Ohman, K.A., 2020, Changing storm conditions in response to projected 21st century climate change and the potential impact on an arctic barrier island–lagoon system—A pilot study for Arey Island and Lagoon, eastern Arctic Alaska: U.S. Geological Survey Open-File report 2020-1142

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    A formal accuracy assessment was not conducted. Results are within the expected range.
  2. How accurate are the geographic locations?
    A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. Accuracy is considered to be less than +/- 4 based on the accuracy of the source data sets.
  3. How accurate are the heights or depths?
    A formal accuracy assessment of the vertical positional information in the data set has not been conducted. Accuracy is considered to be less than +/- 30 cm based on the accuracy of the source data sets.
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    Data have been checked for outliers and omissions.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in .tif format accompanied by CSDGM FGDC compliant metadata and an example browse graphic.
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    These data can be viewed with any raster reading software.

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2021
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P9LGYO2Q/BTI_AreyLagoonDigitalElevationModel_metadata.faq.html>
Generated by mp version 2.9.50 on Thu Oct 14 14:47:22 2021