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    • This is a Non-Federal dataset covered by different Terms of Use than Data.gov.

    TRE ALTAMIRA InSAR Subsidence Data

    Metadata Updated: March 23, 2026

    This dataset represents measurements of vertical ground surface displacement in more than 200 of the high-use and populated groundwater basins across the State of California between January of 2015 and April of 2022. Vertical displacement estimates are derived from Interferometric Synthetic Aperture Radar (InSAR) data that are collected by the European Space Agency (ESA) Sentinel-1A satellite and processed by TRE ALTAMIRA Inc. (TRE), under contract with the California Department of Water Resources (DWR) as part of DWR’s SGMA technical assistance to provide important SGMA-relevant data to GSAs for GSP development and implementation. Sentinel-1A InSAR data coverage began in late 2014 for parts of California, and coverage for the entire study area began in June 13, 2015. Included in this dataset are point data that represent average vertical displacement values for 100 meter by 100 meter areas, as well as GIS rasters that were interpolated from the point data; rasters for total vertical displacement relative to June 13, 2015, and rasters for annual vertical displacement rates with earlier coverage for some areas, both in monthly time steps. Towill Inc. (Towill), also under contract with DWR as part of DWR’s SGMA technical assistance, conducted an independent study comparing the InSAR-based vertical displacement point time series data to data from Continuous Global Positioning System (CGPS) stations. The goal of this study was to ground-truth the InSAR results to best available independent data.

    Data update frequency: Quarterly Report update frequency: Annual

    Access & Use Information

    Public: This dataset is intended for public access and use. Non-Federal: This dataset is covered by different Terms of Use than Data.gov. License: No license information was provided.

    Downloads & Resources

    Dates

    Metadata Created Date July 23, 2025
    Metadata Updated Date March 23, 2026

    Metadata Source

    Harvested from State of California

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date July 23, 2025
    Metadata Updated Date March 23, 2026
    Publisher California Department of Water Resources
    Maintainer
    Identifier 9ec1c5a1-fa9f-4d1b-bbaa-288ba2d36b84
    Data First Published 2019-05-02T06:03:09.188964
    Data Last Modified 2026-03-20T20:54:43.241537
    Category Natural Resources, Water
    Public Access Level public
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id 623b833d-24b1-4813-a352-6a133d3a1671
    Harvest Source Id 3ba8a0c1-5dc2-4897-940f-81922d3cf8bc
    Harvest Source Title State of California
    Source Datajson Identifier True
    Source Hash b024458e18da0452a9819f5a366359294da15c16b7fa9ce82842cfa9196fb93d
    Source Schema Version 1.1

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