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    • OPERA Radiometric Terrain Corrected SAR Backscatter from Sentinel-1 validated product (Version 1)

    Metadata Updated: March 24, 2025

    The Observational Products for End-Users from Remote Sensing Analysis (OPERA) Radiometric Terrain Corrected (RTC) SAR Backscatter from Sentinel-1 (S1) validated product consists of radar backscatter normalized with respect to the topography. The product maps signals related to the physical properties of ground scattering objects, such as surface roughness and soil moisture and/or vegetation. The OPERA RTC-S1 product is derived from Copernicus Sentinel-1 Interferometric Wide (IW) Single Look Complex (SLC) data with a near global scope and temporal sampling coincident with the availability of S1 SLC data.

    Each OPERA RTC-S1 product corresponds to a single S1 burst projected onto a pre-defined UTM/Polar stereographic map projection system map grid with a 30-meter spacing. The Copernicus global 30 m (GLO-30) Digital Elevation Model (DEM) is the reference DEM used to correct for the impacts of topography and to geocode the product. The OPERA RTC-S1 product is normalized to the backscatter coefficient gamma-naught, ɣ0, obtained from the original radar brightness beta-naught, β0, through radiometric terrain correction. The RTC-S1 product is distributed as cloud optimized GeoTIFFs with one GeoTIFF file per processed polarization. The RTC-S1 product metadata is provided in the Hierarchical Data Format version 5 (HDF5) format. The OPERA RTC-S1 product contains modified Copernicus Sentinel data (2022-2025).

    Due to the S1 mission’s narrow orbital tube, radar-geometry layers such as incidence angle, local incidence angle, number of looks, and RTC Area Normalization Factor (ANF) vary slightly over time for each position on the ground, and therefore are considered static. These static layers are provided separately from the OPERA RTC-S1 product, as they are produced only once or a limited number of times, to account for changes in the DEM, in the S1 orbit, or in the static-layers generation algorithm. The static layers are available in the associated OPERA Radiometric Terrain Corrected SAR Backscatter from Sentinel-1 Static Layers validated product (Version 1) dataset.

    Access & Use Information

    Public: This dataset is intended for public access and use. 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

    References

    https://doi.org/10.1109/TGRS.2022.3147472

    Dates

    Metadata Created Date October 25, 2023
    Metadata Updated Date March 24, 2025

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    Image to represent the collection

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date October 25, 2023
    Metadata Updated Date March 24, 2025
    Publisher ASF
    Maintainer
    Identifier C2777436413-ASF
    Data First Published 2022-01-01
    Language en-US
    Data Last Modified 2025-03-20
    Category SNWG/OPERA, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://data.nasa.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Citation OPERA. OPERA Radiometric Terrain Corrected SAR Backscatter from Sentinel-1 validated product (Version 1). Version 1. Archived by National Aeronautics and Space Administration, U.S. Government, NASA Alaska Satellite Facility Distributed Active Archive Center. https://doi.org/10.5067/SNWG/OPERA_L2_RTC-S1_V1.
    Creator OPERA
    Graphic Preview Description Image to represent the collection
    Graphic Preview File https://datapool.asf.alaska.edu/BROWSE/OPERA-S1/OPERA_L2_RTC-S1_T124-264306-IW2_20231027T043121Z_20231027T184651Z_S1A_30_v1.0_BROWSE.png
    Harvest Object Id bf08c816-bdf6-4bf5-a172-130b5cdef69a
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/SNWG/OPERA_L2_RTC-S1_V1
    Metadata Type geospatial
    Old Spatial -180.0 -90.0 180.0 90.0
    Program Code 026:001
    Related Documents https://doi.org/10.1109/TGRS.2022.3147472
    Source Datajson Identifier True
    Source Hash 8110d9692084d810a1815eeb904424d44069234d41e846171eeb8a9e88132354
    Source Schema Version 1.1
    Spatial
    Temporal 2022-01-01T00:00:00Z/2025-03-24T00:00:00Z

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