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    • EK60 Water Column Sonar Data Collected During EX2305

    Metadata Updated: April 1, 2024

    From August 1 - August 17, 2023 (Unalaska, Alaska to Kodiak, Alaska), NOAA Ocean Exploration completed the expedition Seascape Alaska 4: Gulf of Alaska Mapping (EX2305). Mapping operations during this 17-day expedition aided in closing bathymetric gaps off the coast of the Aleutian Islands and in the Gulf of Alaska. EX2305 collected 23,591 square kilometers of seafloor bathymetry within the U.S. Exclusive Economic Zone deeper than 200 m. During mapping operations, NOAA Ocean Exploration simultaneously collected EM 304 multibeam sonar bathymetry observations and Simrad EK60/EK80 split-beam fisheries sonar observations of biologic material in the water column, as well as Knudsen 3260 sub-bottom profiler observations of sub-seafloor geologic structure and sediment. A focused survey region targeted seamounts in the Gulf of Alaska. During the expedition, an EK calibration was completed for the 18, 38, 70, 120, and 200 kHz frequency sonars. The exploratory mapping operations conducted during this cruise will provide initial characterization of the region, as well as data to support further exploration. All data associated with this expedition will be archived within 120 days of the end of the expedition and will be publicly available through the NOAA Archives.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date March 14, 2024
    Metadata Created Date April 1, 2024
    Metadata Updated Date April 1, 2024
    Reference Date(s) August 1, 2023 (creation), March 14, 2024 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NGDC MGG Sonar Water Column

    Other Data Resources

    Additional Metadata

    Resource Type Series
    Metadata Date March 14, 2024
    Metadata Created Date April 1, 2024
    Metadata Updated Date April 1, 2024
    Reference Date(s) August 1, 2023 (creation), March 14, 2024 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ncei:EX2305_EK60
    Access Constraints Cite as: NOAA Ocean Exploration. 2024. EK60 Water Column Sonar Data Collected During EX2305. NOAA National Centers for Environmental Information. https://doi.org/10.25921/1344-jc85 [access date], 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., Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose., Resource may not be available for up to one year after initial collection.
    Bbox East Long -149.70083
    Bbox North Lat 58.89048
    Bbox South Lat 53.58392
    Bbox West Long -163.57693
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id d0aa8cba-5c36-4183-94a0-3c49e31cf488
    Harvest Source Id ab8b0290-e4db-4a00-89f2-4e427c2054b2
    Harvest Source Title NGDC MGG Sonar Water Column
    Licence These data are considered raw and have not been subjected to the NOAA's quality control or quality assurance procedures. They are released for limited public use as preliminary data to be used only with appropriate caution. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty., Not subject to copyright protection within the United States.
    Lineage Calibrated w/ calibration data
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-163.57693, 53.58392], [-149.70083, 53.58392], [-149.70083, 58.89048], [-163.57693, 58.89048], [-163.57693, 53.58392]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2023-08-01T00:00:00
    Temporal Extent End 2023-08-17T11:59:59

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