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    • EM304 Water Column Sonar Data Collected During EX2307

    Metadata Updated: April 1, 2024

    From September 23 – October 14, 2023 (Seward, Alaska to San Francisco, California), NOAA Ocean Exploration completed Seascape Alaska 6: Gulf of Alaska Transit Mapping (EX2307). Operations during this 22-day expedition aided in closing bathymetric gaps in the Gulf of Alaska, British Columbia, Canada, and off the coasts of Washington, Oregon, and California. EX2307 collected 47,899 square kilometers of seafloor bathymetry, of which 40,108 square kilometers were within the U.S. Exclusive Economic Zone deeper than 200 m. During mapping operations, NOAA Ocean Exploration simultaneously collected EM 304 multibeam sonar bathymetry observations and Simrad EK60/EK80 split-beam fisheries sonar observations of biologic material in the water column, as well as Knudsen 3260 sub-bottom profiler observations of sub-seafloor geologic structure and sediment. Focused survey regions included closing bathymetric gaps in the Gulf of Alaska, Canada, and California. An additional focused survey in the Cascadia margin off the coast of Washington improved data quality in a region of interest for geological hazards. The exploratory mapping operations conducted during this expedition will provide initial characterization of the region, as well as data to support further exploration.

    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 2, 2024
    Metadata Created Date April 1, 2024
    Metadata Updated Date April 1, 2024
    Reference Date(s) September 23, 2023 (creation), March 2, 2024 (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 2, 2024
    Metadata Created Date April 1, 2024
    Metadata Updated Date April 1, 2024
    Reference Date(s) September 23, 2023 (creation), March 2, 2024 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ncei:EX2307_EM304
    Access Constraints Cite as: NOAA Ocean Exploration. 2024. EM304 Water Column Sonar Data Collected During EX2307. NOAA National Centers for Environmental Information. https://doi.org/10.25921/w6s9-yf35 [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 -123.17779
    Bbox North Lat 59.35084
    Bbox South Lat 36.78241
    Bbox West Long -148.97256
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id c6f8550e-438a-42c3-a283-02b50444e35e
    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 Unknown
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-148.97256, 36.78241], [-123.17779, 36.78241], [-123.17779, 59.35084], [-148.97256, 59.35084], [-148.97256, 36.78241]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2023-09-23T00:00:00
    Temporal Extent End 2023-10-14T11:59:59

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