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    • AFSC/RACE/GAP/Prescott: Central Gulf of Alaska Multibeam Survey H11118

    Metadata Updated: April 1, 2024

    We assembled 1.75 million National Ocean Service (NOS) bathymetric soundings from 225 lead-line and single-beam echosounder hydrographic surveys conducted from 1901 to 1999 in the central Gulf of Alaska. These bathymetry data are available from the National Geophysical Data Center (NGDC: http://www.ngdc.noaa.gov), which archives and distributes data that were originally collected by the NOS and others. While various bathymetry data have been downloaded previously from NGDC, compiled, and used for a variety of projects, our effort differed in that we compared and corrected the digital bathymetry by studying the original analog source documents - digital versions of the original survey maps, called smooth sheets. There were several areas where these older surveys were superseded by more recent, higher quality multibeam surveys, mostly from the NOS (n=106). Three of these were unprocessed NOS multibeam surveys in the Sitka area, which we edited and processed into final bathymetric surfaces. We reduced the resolution of these multibeam surveys to 100 m, since some may have sub-meter resolution and many exceed a million soundings, and added them to our bathymetry compilation. In Sitka Sound survey H11118 was missing. Processing and adding its bathymetric data to our compilation filled in a substantial gap in Sitka area, between Kruzof, Krestof, and Middle islands.

    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 February 29, 2024
    Metadata Created Date October 28, 2022
    Metadata Updated Date April 1, 2024
    Reference Date(s) 2015 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NMFS AFSC

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date February 29, 2024
    Metadata Created Date October 28, 2022
    Metadata Updated Date April 1, 2024
    Reference Date(s) 2015 (publication)
    Responsible Party (Point of Contact, Custodian)
    Contact Email
    Guid gov.noaa.nmfs.inport:22958
    Access Constraints Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/RACE/GAP/Prescott: Central Gulf of Alaska Multibeam Survey H11118 [Data Date Range], https://www.fisheries.noaa.gov/inport/item/22958., Access Constraints: These data are not to be used for navigation., Use Constraints: These data are not to be used for navigation. We consider this bathymetry compilation a fairly complete first draft and sufficient in quality for addition to the central Gulf of Alaska bathymetry compilation.
    Bbox East Long -135.4
    Bbox North Lat 57.17
    Bbox South Lat 57.06
    Bbox West Long -135.57
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 92a8f276-a047-4de8-8654-750e38203216
    Harvest Source Id 26a29bb9-50b0-47fd-920b-edc74aa6ec76
    Harvest Source Title NMFS AFSC
    Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
    Lineage unknown
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-135.57, 57.06], [-135.4, 57.06], [-135.4, 57.17], [-135.57, 57.17], [-135.57, 57.06]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 2004
    Temporal Extent End 2004

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