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    • Hard-Soft Seafloor Classification, 40m - Swains, American Samoa

    Metadata Updated: January 26, 2025

    Preliminary hard and soft seafloor substrate map derived from an unsupervised classification of multibeam backscatter and bathymetry derivatives at Swains Island, American Samoa. The dataset was created from gridded (40 m cell size) multibeam bathymetry derivatives collected aboard R/V AHI, and NOAA ship Hi'ialakai; two scales of bathymetric variance and bathymetric rugosity. Backscatter data were from a 300 kHz Simrad EM300 and a 240 kHz Reson 8101 sonar, gridded at 5 m. Very limited seafloor photographs for groundtruthing are available for Swains Island and therefore no supervised classification was performed and we are unable to visually or empirically evaluate the accuracy of the unsupervised classification seafloor substrate map. However, in locations such French Frigate Shoals, NWHI, and Tutuila, American Samoa, where ground truth data are available, the unsupervised classification method is a robust predictor of substrate type in similar depth ranges and seafloor environments. Since groundtruthing was not used to validate the unsupervised classification at Swains Island extreme caution should be used when examining these data to locate habitat of biological significance. The map should be used in conjunction with bathymetric derivatives such as rugosity, slope, and Bathymetric Position Index (BPI).

    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.

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    Dates

    Metadata Date November 14, 2024
    Metadata Created Date November 12, 2020
    Metadata Updated Date January 26, 2025
    Reference Date(s) January 25, 2016 (creation), January 25, 2016 (issued), January 25, 2016 (revision)
    Frequency Of Update

    Metadata Source

    Harvested from ioos

    Other Data Resources

    Graphic Preview

    Sample image.

    Additional Metadata

    Resource Type Dataset
    Metadata Date November 14, 2024
    Metadata Created Date November 12, 2020
    Metadata Updated Date January 26, 2025
    Reference Date(s) January 25, 2016 (creation), January 25, 2016 (issued), January 25, 2016 (revision)
    Responsible Party Pacific Islands Benthic Habitat Mapping Center (PIBHMC) (Point of Contact)
    Contact Email
    Guid as_pibhmc_swa_40m_hardsoft
    Access Constraints
    Bbox East Long -170.861
    Bbox North Lat -10.876
    Bbox South Lat -11.211
    Bbox West Long -171.28
    Coupled Resource [{"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}]
    Frequency Of Update
    Graphic Preview Description Sample image.
    Graphic Preview File http://pacioos.org/metadata/browse/as_pibhmc_swa_40m_hardsoft.png
    Harvest Object Id dae001a0-c778-4323-9bf1-8080b881e604
    Harvest Source Id 54e15a6e-6dde-4c9c-a8f0-345cc0dfccfb
    Harvest Source Title ioos
    Licence
    Lineage 2016-01-25T00:00:00Z OGC web services (WMS and WFS) enabled by PacIOOS via GeoServer. Original data from source provider may have been reformatted, reprojected, or adjusted in other ways to optimize these capabilities.
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-171.28, -11.211], [-170.861, -11.211], [-170.861, -10.876], [-171.28, -10.876], [-171.28, -11.211]]]}
    Progress
    Spatial Data Service Type Open Geospatial Consortium Web Coverage Service (WCS)
    Spatial Reference System
    Spatial Harvester True

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