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    • EK60 Water Column Sonar Data Collected During DS0708

    Metadata Updated: April 1, 2026

    On 26 August, 2007, David Starr Jordan dropped anchor off Shelter Island, San Diego Bay, for approximately 6 hrs to calibrate the echosounders (Simrad EK60). Immediately following the calibration, the ROV was launched to test buoyancy and system functions. Then, the multi-beam transducer was installed on the pole and the pole was mounted on the ship’s port-side. The ship then proceeded to the 43 Fathom Bank. The multi-frequency echosounder survey and ROV transects took priority over all other activities. The echosounder surveys were conducted between sunrise and sunset. The ROV was deployed between sunrise and approximately 1730. The CTD casts and the recoveries of the passive-acoustic loggers were also conducted during daylight hours. The multi-beam transects and the deployments of the passive-acoustic loggers were conducted exclusively at nighttime.

    The 43 Fathom Bank site was surveyed twice during Leg I and once each during Legs II, III and IV, for a total of 5 replicates. At the beginning of Leg I, a long-duration passive acoustic logger (AURAL) was deployed at the 43 Fathom Bank. This logger was recovered at the end of Leg IV. Additionally, during nighttime hours of Leg I only, multi-beam surveys were conducted at 109 Seamount, and 43 Fathom, Cortes, and Tanner Banks. At night during Legs II-IV, the ship 1) deployed the CTD, 2) deployed passive-acoustic loggers, and 3) transited to the next survey segment and was staged to begin the next echosounder survey segment or ROV transect at sunrise.

    Multiple-frequency echosounders (Simrad EK60s) were used to sample grids with 0.2 n.mi. transect spacing (0.1 n.mi. for smaller sites) at 47 sites in the SCB. These areas and waypoints were selected from the results of the COAST 2003 and 2004 surveys, and the collective records from multiple Fishing Masters in the commercial fleet (courtesy of Ken Franke). Surveys were conducted between sunrise and sunset (approximately 1400 to 0100 GMT, 0700 to 1800 PST, or 11 hrs per day off daylight savings time or approximately 1245 to 0245 GMT, 0545 to 1945 PST, or 13.5-14 hrs per day; PST=GMT-7 hrs. during daylight savings), at a nominal speed of 7-10 kts. The total trackline, with 0.2 n.mi. transect spacing (0.1 n.mi. for smaller sites), totaled approximately 2654 n.mi.. The rockfishes and seabed in each area were mapped using the backscatter data.

    Report Link: https://discover.library.noaa.gov/permalink/01NOAA_INST/1uosbql/alma991001553014607381

    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 March 10, 2026
    Metadata Created Date April 1, 2026
    Metadata Updated Date April 1, 2026
    Reference Date(s) August 26, 2007 (creation), March 10, 2026 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NGDC MGG Sonar Water Column

    Other Data Resources

    Additional Metadata

    Resource Type Series
    Metadata Date March 10, 2026
    Metadata Created Date April 1, 2026
    Metadata Updated Date April 1, 2026
    Reference Date(s) August 26, 2007 (creation), March 10, 2026 (publication)
    Responsible Party (Point of Contact); NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ncei:DS0708_EK60
    Access Constraints Cite as: NOAA Southwest Fisheries Science Center. 2026. EK60 Water Column Sonar Data Collected During DS0708. NOAA National Centers for Environmental Information. https://doi.org/10.25921/ntvy-c246 [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 -117.19883
    Bbox North Lat 34.16217
    Bbox South Lat 32.00067
    Bbox West Long -120.64283
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id d9836d8b-3e97-4d9c-b1e3-95749562070a
    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/o calibration data
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-120.64283, 32.00067], [-117.19883, 32.00067], [-117.19883, 34.16217], [-120.64283, 34.16217], [-120.64283, 32.00067]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2007-08-26T00:00:00
    Temporal Extent End 2007-10-31T11:59:59

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