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    • SWOT Level 2 Nadir Altimeter Operational Geophysical Data Record with Waveforms Version 1.0

    Metadata Updated: August 30, 2025

    The SWOT Level 2 Nadir Altimeter Operational Geophysical Data Record (OGDR) with Waveforms Version 1.0 dataset produced by the Surface Water and Ocean Topography (SWOT) mission provides sea surface height, significant wave height and wind speed measurements from the Poseidon-3C nadir altimeter, a Jason-class dual frequency (Ku/C) altimeter. SWOT is a joint mission between NASA and CNES that launched on December 16, 2022. It aims to measure ocean surface topography with unprecedented resolution and accuracy, as well as map inland water bodies globally. The OGDR dataset consists of discrete measurements along the nadir track with sampling resolutions of approximately 6-km and 300-m at 1Hz and 20Hz, respectively. The data were processed using the onboard DORIS orbit ephemeris, with predicted values for certain auxiliary data and no GIM ionosphere model values. The OGDR data are distributed as one file per data downlink in netCDF-4 file format with a nominal latency of < 7 hours.

    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

    Dates

    Metadata Created Date July 27, 2023
    Metadata Updated Date August 30, 2025

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date July 27, 2023
    Metadata Updated Date August 30, 2025
    Publisher NASA/JPL/PODAAC
    Maintainer
    Identifier C2296989383-POCLOUD
    Data First Published 2022-06-28
    Language en-US
    Data Last Modified 2025-03-31
    Category SWOT, geospatial
    Public Access Level public
    Bureau Code 026:00
    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 cc23dc32-5ba7-4833-a02c-77211111157e
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/SWOT-NALT-OGDR-1.0
    Metadata Type geospatial
    Old Spatial -180.0 -77.6 180.0 77.6
    Program Code 026:001
    Source Datajson Identifier True
    Source Hash d32248047ad3c06788b2ccfd30924782be8fb2bfa99610bc3378b9c92ca45bf3
    Source Schema Version 1.1
    Spatial
    Temporal 2022-12-16T00:00:00Z/2023-07-03T00:00:00Z

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