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    • EK60 Water Column Sonar Data Collected During DY1701

    Metadata Updated: September 17, 2021

    Acoustic-Trawl Surveys of Walleye Pollock in the Gulf of Alaska (DY1701, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA Fisheries, Alaska Fisheries Science Center (AFSC) conducted acoustic-trawl (AT) stock assessment surveys in the Gulf of Alaska (GOA) during the winter and early spring of 2017 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). These surveys were conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The primary instrument for the surveys was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz). The vessel departed Kodiak, Alaska on 7 February and conducted the Shumagin Islands survey (including Shumagin Trough from Renshaw Point to Simeonof Island, Stepovak Bay, Unga Strait, and West Nagai Strait) 8-11 February. The Sanak Trough survey was conducted on 11 February followed by the Morzhovoi Bay survey on 12 February. The vessel transited to Pavlov Bay and conducted the Pavlov survey 13-14 February. A calibration of the echosounder system was conducted on 14 February in Volcano Bay, Alaska. The vessel returned to its homeport of Kodiak, Alaska on 16 February, 2017.

    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.

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    Dates

    Metadata Date September 14, 2021
    Metadata Created Date November 12, 2020
    Metadata Updated Date September 17, 2021
    Reference Date(s) February 6, 2017 (creation), April 2, 2018 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NGDC MGG Sonar Water Column

    Other Data Resources

    Additional Metadata

    Resource Type Series
    Metadata Date September 14, 2021
    Metadata Created Date November 12, 2020
    Metadata Updated Date September 17, 2021
    Reference Date(s) February 6, 2017 (creation), April 2, 2018 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ngdc.mgg.wcd:DY1701_EK60
    Access Constraints Cite as: Alaska Fisheries Science Center. 2017. 'EK60 Water Column Sonar Data Collected During DY1701'. NOAA National Centers for Environmental Information. doi:10.7289/V5RJ4GRM [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 -151.99901
    Bbox North Lat 58.02224
    Bbox South Lat 54.41625
    Bbox West Long -163.22527
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 9906c8ec-d37f-42e2-a72b-df8f114bf45b
    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.
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-163.22527, 54.41625], [-151.99901, 54.41625], [-151.99901, 58.02224], [-163.22527, 58.02224], [-163.22527, 54.41625]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2017-02-06T20:53:52
    Temporal Extent End 2017-02-16T15:42:43

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