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    • EK60 Water Column Sonar Data Collected During FR1003

    Metadata Updated: June 9, 2023

    2010 California Current Ecosystem Survey. Measurements of volume backscattering strength (Sv; dB re 1 m) and target strength (TS; dB 1 m2) were made using four calibrated Simrad EK60 general purpose transceivers (GPTs) configured with split-beam transducers at frequencies of 38, 70, 120, and 200 kHz. To index the data by time and geographic position, a GPS receiver provided navigational data to the echosounder software (ER60). The echosounder system was tested and calibrated while FROSTI was anchored at Elliot Bay Anchorage (Washington) two days prior to the start of the cruise. EK60 data was collected to 250 m depths by transmitting 1024-µs pulses of the four frequencies simultaneously, every 0.5 seconds. The depth range was chosen to accommodate the depth distribution of CPS (i.e., ca. 70 m depth) and krill (i.e., ca. 250 m depth), and the fast pulse repetition allows multiple insonification of relatively small fish schools at the sampling speed of 8 kts.

    The echoes were received with bandwidths of 2.425, 2.859, 3.026, and 3.088 kHz, respectively, and digitized every 256 µs (ER60; .raw data format) in a laptop computer. All the EK60 frequencies were triggered simultaneously, and all other echosounders, speed logs, and sonars operating at or near the survey frequencies were secured during survey operations. Exceptions were made during directed trawl operations when a net sounder was activated.

    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 14, 2021
    Metadata Created Date November 10, 2022
    Metadata Updated Date June 9, 2023
    Reference Date(s) March 28, 2010 (creation), April 16, 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 10, 2022
    Metadata Updated Date June 9, 2023
    Reference Date(s) March 28, 2010 (creation), April 16, 2018 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ncei.wcd:FR1003_EK60
    Access Constraints Cite as: NOAA Southwest Fisheries Science Center. 2010. 'EK60 Water Column Sonar Data Collected During FR1003'. NOAA National Centers for Environmental Information. https://doi.org/10.25921/fst7-nk69 [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 -121.72732
    Bbox North Lat 48.75809
    Bbox South Lat 34.88179
    Bbox West Long -127.18877
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 11ab76b8-69f2-47be-9481-29bd8ecf7558
    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": [[[-127.18877, 34.88179], [-121.72732, 34.88179], [-121.72732, 48.75809], [-127.18877, 48.75809], [-127.18877, 34.88179]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2010-03-28T00:35:50
    Temporal Extent End 2010-04-28T17:04:32

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