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    • Vertical Land Motion - Tutuila and Aunuu, American Samoa

    Metadata Updated: December 27, 2024

    Land subsidence rates across Tutuila and Aunuu are drawn from recent work by Huang et al. (2022) showing that the average rate of subsidence on these islands is spatially variable and ranges from 6 to 9 mm/yr. The study analyzed all available radar data from the European Space Agency (ESA) Sentinel-1 satellite, which covers Tutuila and Aunuu only, and derived an average subsidence rate for the 6-year period between September 2015 to December 2022. Data are available over areas where radar data was successfully used to retrieve unambiguous measurements. Vertical land motion (VLM) measurements are provided by this data layer in millimeters per year (mm/yr), with negative values indicating land subsidence.

    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 August 26, 2024
    Metadata Updated Date December 27, 2024
    Reference Date(s) November 23, 2022 (creation), November 23, 2022 (issued), November 23, 2022 (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 August 26, 2024
    Metadata Updated Date December 27, 2024
    Reference Date(s) November 23, 2022 (creation), November 23, 2022 (issued), November 23, 2022 (revision)
    Responsible Party NASA Goddard Space Flight Center (GSFC) (Point of Contact)
    Contact Email
    Guid as_nasa_tutma_vlm
    Access Constraints
    Bbox East Long -170.55930555543
    Bbox North Lat -14.23069444785
    Bbox South Lat -14.37347222677
    Bbox West Long -170.84736111329
    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_nasa_tutma_vlm.png
    Harvest Object Id fd0d1925-7ff7-44ec-9e02-cbf3d0ba174a
    Harvest Source Id 54e15a6e-6dde-4c9c-a8f0-345cc0dfccfb
    Harvest Source Title ioos
    Licence
    Lineage 2022-11-23T00:00:00Z Data first published as part of Geophysical Research Letters publication https://doi.org/10.1029/2022GL101363. 2023-11-27T00:00:00Z Data published in PacIOOS GeoServer for use by the American Samoa Sea Level Rise Viewer.
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-170.84736111329, -14.37347222677], [-170.55930555543, -14.37347222677], [-170.55930555543, -14.23069444785], [-170.84736111329, -14.23069444785], [-170.84736111329, -14.37347222677]]]}
    Progress
    Spatial Data Service Type Open Geospatial Consortium Web Feature Service (WFS)
    Spatial Reference System
    Spatial Harvester True

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