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    • EK80 Water Column Sonar Data Collected During RL1907

    Metadata Updated: October 1, 2023

    The survey domain was defined by the modeled distribution of potential habitat for the northern subpopulation (stock) of Pacific Sardine (Zwolinski et al., 2011), and information recently gathered from other research projects [e.g., California Cooperative Oceanic Fisheries Investigations (CalCOFI) samples] or fishing industry reports (e.g., catch and bycatch data). This area encompassed the anticipated distributions of the northern stock of Pacific Sardine and the central and northern stocks of Northern Anchovy off the west coasts of the U.S. and Canada from approximately San Diego, CA, to Cape Scott, British Columbia, but also spanned portions of the southern stock of Pacific Sardine, and stocks of Pacific Mackerel, Jack Mackerel, and Pacific Herring.

    On Lasker, multi-frequency EK60 General Purpose Transceivers (18-and 38-kHz GPTs; Simrad) and EK80 Wideband Transceivers (70-, 120-, 200-, and 333-kHz WBTs; Simrad) were configured with split-beam transducers (ES18-11, ES38B, ES70-7C, ES120-7C, ES200-7C, and ES333-7C, respectively; Simrad). The transducers were mounted on the bottom of a retractable keel or “centerboard”. The keel was retracted (transducers~5-m depth) during calibration, and extended to the intermediate position (transducers ~7-m depth) during the survey. Exceptions were made during shallow water operations, when the keel was retracted; or during times of heavy weather, when the keel was extended (transducers~9-mdepth) to provide extra stability and reduce the effect of weather-generated noise. Transducer position and motion were measured at 5Hz using an inertial motion unit (Applanix POS-MV, Trimble).

    Final 2021 Report: https://doi.org/10.25923/dg6w-q452 Final 2021 Biomass Report: https://doi.org/10.25923/nghv-7c40

    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 September 12, 2023
    Metadata Created Date October 1, 2023
    Metadata Updated Date October 1, 2023
    Reference Date(s) June 13, 2019 (creation), September 12, 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 September 12, 2023
    Metadata Created Date October 1, 2023
    Metadata Updated Date October 1, 2023
    Reference Date(s) June 13, 2019 (creation), September 12, 2023 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ncei:RL1907_EK80
    Access Constraints Cite as: NOAA Southwest Fisheries Science Center. 2023. EK80 Water Column Sonar Data Collected During RL1907. NOAA National Centers for Environmental Information. https://doi.org/10.25921/99hk-a071 [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 -117.18476
    Bbox North Lat 50.75984
    Bbox South Lat 0.0
    Bbox West Long -129.25519
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id da3c21c5-ba0d-4310-a84b-d7fd94a488b4
    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": [[[-129.25519, 0.0], [-117.18476, 0.0], [-117.18476, 50.75984], [-129.25519, 50.75984], [-129.25519, 0.0]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2019-06-13T00:00:00
    Temporal Extent End 2019-09-09T11:59:59

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