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Dataset Overview | National Centers for Environmental Information (NCEI)

EK60 Water Column Sonar Data Collected During OD0501

Acoustic-Trawl Survey of Walleye Pollock in the Gulf of Alaska (OD0501, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey of walleye pollock (Theraga Chalcogramma) along sections of the Gulf of Alaska shelf and shelfbreak from the Islands of Four Mountains to south of Prince William Sound, 30 June to 30 July 2005. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation, utilizing a Simrad EK60 split-beam echosounder system. The vessel departed Kodiak, Alaska on 2 July and arrived in Kodiak on 29 July. The cruise was completed in two legs with a port call in Dutch Harbor, Alaska 12-13 July. The EK60 echosounder system was calibrated at the start of the cruise in Three Saints Bay, Kodiak Island, Alaska on 2 June, and at the end of the cruise in Three Saints Bay on 28 July 2005.
  • Cite as: Alaska Fisheries Science Center. 2005. 'EK60 Water Column Sonar Data Collected During OD0501'. NOAA National Centers for Environmental Information. doi:10.7289/V52805QZ [access date]
gov.noaa.ngdc.mgg.wcd:OD0501_EK60
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Search Data
Distribution Formats
  • Simrad EK60 raw (.raw) format (Version: 1)
    • File Specification: Kongsberg/Simrad .raw files are generated by ME70, EK60 or ES60 instruments. They contain power and optionally angular position data with each beam/frequency identified by an independent channel. See the Simrad interface specification manual for further information. The .wcd files are generated by Kongsberg EM302 or EM122 instruments. See Kongsberg documentation for more information.
Ordering Instructions Contact the NCEI Water Column Sonar Data Manager to order data.
Distributor NOAA National Centers for Environmental Information
ncei.info@noaa.gov
Dataset Point of Contact NOAA National Centers for Environmental Information
ncei.info@noaa.gov
Dataset Point of Contact Water Column Sonar Data Manager
NOAA National Centers for Environmental Information
(303) 497-4742
wcd.info@noaa.gov
Time Period 2005-06-01T16:08:17 to 2005-07-28T21:21:34
Spatial Reference System urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown
Spatial Bounding Box Coordinates
West: -170.04038
East: 0.0
South: 0.0
North: 59.15755
Spatial Coverage Map
General Documentation
Associated Resources
    Publication Dates
    • creation: 2005-06-01
    • publication: 2017-01-03
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency Not planned
    Purpose Acoustic-trawl (AT) survey of walleye pollock (Theragra chalcogramma) on the Gulf of Alaska shelf and shelfbreak, 30 June to 30 July 2005
    Use Limitations
    • 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.
    Dataset Citation
    • Cite as: Alaska Fisheries Science Center. 2005. 'EK60 Water Column Sonar Data Collected During OD0501'. NOAA National Centers for Environmental Information. doi:10.7289/V52805QZ [access date]
    Cited Authors
    • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
    Principal Investigators
    • Chris Wilson
      DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
    Custodians
    • NOAA National Centers for Environmental Information
    Publishers
    • NOAA National Centers for Environmental Information
    Theme keywords Global Change Master Directory (GCMD) Science Keywords
    • Earth Science > Oceans > Ocean Acoustics > Acoustic Scattering
    • Earth Science > Oceans > Aquatic Sciences > Fisheries
    • Earth Science > Oceans > Ocean Acoustics
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Pelagic
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Benthic
    • Earth Science > Biosphere > Ecosystems > Aquatic Ecosystems
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
    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
    • DOC/NOAA/NMFS > National Marine Fisheries Service, NOAA, U.S. Department of Commerce
    Instrument keywords Global Change Master Directory (GCMD) Instrument Keywords
    • In Situ/Laboratory Instruments > Profilers/Sounders > Acoustic Sounders > WCMS > Water Column Mapping System
    Place keywords International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas" publication S-23)
    • Gulf of Alaska
    Global Change Master Directory (GCMD) Location Keywords
    • Vertical Location > Water Column
    Use Constraints
    • Cite as: Alaska Fisheries Science Center. 2005. 'EK60 Water Column Sonar Data Collected During OD0501'. NOAA National Centers for Environmental Information. doi:10.7289/V52805QZ [access date]
    • 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.
    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.
    • Resource may not be available for up to one year after initial collection.
    Fees
    • Free
    Lineage information for: series
    Processor
    • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
    Lineage information for: series
    Lineage Statement The primary instrument for the survey was a Simrad EK60 split-beam echosounder system utilizing four frequencies (18, 38, 120, and 200 kHz). The EK60 38, 120 and 200 kHz transducers installed on the Oscar Dyson are mounted on a deployable centerboard. The transducer draft settings in the EK60 software are nominally correct when the centerboard is fully extended (draft correction setting is 9.15 meters below the surface). When the centerboard is in the retracted position (transducers approximately flush with the vessel's keel), the transducers are nominally 6.1 meters below the surface. The 18 kHz transducer was mounted on the ship's hull approximately 10 meters forward of the ship's centerboard and approximately 1.5 meters to the port side of the ship's centerline with a nominal draft of 4.96 meters. The echosounder system was calibrated at the start (2 June) and end (28 July) of the of the cruise in Three Saints Bay, Kodiak Island, Alaska.
    Acquisition Information (collection)
    Instrument
    • Simrad EK60
    • Simrad ME70
    • Simrad EK60
    • Simrad ES60
    • Knudsen CHIRP 3260
    • Sippican XBT/XSV
    • SBE 49 FastCAT
    • SBE 911plus CTD
    • SBE 32
    • POS/MV 320
    Platform
    • Oscar Dyson (DY)
    Operation
    • OD0501_EK60
    Last Modified: 2020-06-03
    For questions about the information on this page, please email: ncei.info@noaa.gov