The Surface Water and Ocean Topography (SWOT) project is pleased to announce the public release of the Level 2 Geophysical Data Record (GDR) products from the onboard nadir altimeter (NALT) and advanced microwave radiometer (AMR).

SWOT is a joint mission between NASA and CNES and was launched on December 16, 2022. The onboard NALT is a Jason-class dual frequency (Ku/C) altimeter. The onboard AMR is also a Jason-class radiometer but with two active strings that facilitate measurements on the left and right sides of the satellite nadir point.
The datasets included in this public release are from Cycles 400 to 578 (January 15 – July 10, 2023) during the SWOT commissioning and calibration phases (1-day repeat orbit), and Cycles 1-6 (July 21 – November 23, 2023) during the science phase (21-day repeat orbit). Note that some passes are not available in the later portion of cycle 578, and very early portions of Cycles 402 and 1 during orbit transitions as well as instrument turn on.
The NALT and AMR GDR products in this release are accessible at both NASA’s PO.DAAC and CNES AVISO distribution centers. Information on accessing these data is provided below, and further information can be found in the release note.

The SWOT Nadir Altimeter and Radiometer (O/I)-GDR products can be accessed on the AVISO+ web portal and through a new platform of the AVISO+ CNES Data Center's long-term archive catalog, accessible directly using AVISO+ credentials. Further information on SWOT data access can be found via the dedicated webpage on AVISO+:
https://www.aviso.altimetry.fr/en/missions/current-missions/swot/access-to-data.html