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    • EK60-ek5 Water Column Sonar Data Collected During DY1906

    Metadata Updated: February 10, 2023

    The Midwater Assessment and Conservation Engineering (MACE) program of NOAA Fisheries, Alaska Fisheries Science Center (AFSC), conducted acoustic-trawl (AT) stock assessment surveys on the Gulf of Alaska (GOA) shelf and associated bays during the late spring and summer of 2019 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The survey was conducted 30 May - 7 August aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The primary acoustic instrument for the survey was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz). The vessel departed Kodiak, Alaska on 30 May and conducted the survey in three legs with all port calls in Kodiak; the project was completed in Kodiak on August 7. Leg 1 of the project was conducted 30 May \u2013 20 June on the Gulf of Alaska (GOA) shelf from the Islands of Four Mountains to outer Shumagin Trough including Sanak Trough, Morzhovoi Bay, Shumagin Islands area, and Mitrofania area. The leg 2 surveys were conducted 25 June \u2013 16 July in Shelikof Strait, Alitak Bay, Barnabas Trough, Chiniak Trough, and on the Alaska shelf. The leg 3 surveys were conducted 19 July \u2013 7 August and included Marmot Bay, Resurrection Bay, Prince William Sound, and the Alaska shelf from Kodiak to Yakutat Bay. Calibrations of the echosounder system were conducted in Kalsin Bay, Kodiak Island, Alaska at the start and end of the cruise; no significant differences in gain parameters or transducer beam pattern characteristics were noted between the two calibrations.

    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 February 6, 2023
    Metadata Created Date February 10, 2023
    Metadata Updated Date February 10, 2023
    Reference Date(s) May 30, 2019 (creation), February 6, 2023 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NGDC MGG Sonar Water Column

    Other Data Resources

    Additional Metadata

    Resource Type Series
    Metadata Date February 6, 2023
    Metadata Created Date February 10, 2023
    Metadata Updated Date February 10, 2023
    Reference Date(s) May 30, 2019 (creation), February 6, 2023 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ncei:DY1906_EK60-ek5
    Access Constraints Cite as: NOAA Alaska Fisheries Science Center. 2023. EK60-ek5 Water Column Sonar Data Collected During DY1906. NOAA National Centers for Environmental Information. 10.25921/gxv1-ex22 [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 -139.55292
    Bbox North Lat 60.92132
    Bbox South Lat 57.30863
    Bbox West Long -152.77096
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 013a3d4e-5e65-4629-a9b9-b4d6f32e1c31
    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 Unknown
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-152.77096, 57.30863], [-139.55292, 57.30863], [-139.55292, 60.92132], [-152.77096, 60.92132], [-152.77096, 57.30863]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2019-05-30T00:00:00
    Temporal Extent End 2019-08-07T11:59:59

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