63866260-7062-44fd-b202-66c9ea81a683 AVISO aviso@altimetry.fr editor 2026-04-22T16:03:36.595229Z ISO 19115-3:2018 - Remote Sensing ISO 19115-3:2018 - Remote Sensing http://www.opengis.net/def/crs/EPSG/0/4326 Altimetry product SWOT Level-2 KaRIn Low Rate SSH - Unsmoothed Altimetry product SWOT Level-2 KaRIn Low Rate SSH - Unsmoothed Produit altimétrique SWOT Niveau 2 Low Rate SSH - Unsmoothed 2023-12-22 creation 2024-03-05 publication product KaRIn D The Level-2 Ka-band Radar Interferometer (KaRIn) low rate (LR, ocean) sea surface height (SSH) data product from the Surface Water and Ocean Topography (SWOT) mission, also referenced by the short name L2_LR_SSH, provides ocean topography measurements from the low rate ocean data stream of the KaRIn instrument, spanning 60 km on either side of the nadir altimeter with a nadir gap. The L2_LR_SSH product is available continuously and globally, although different versions of the product may be produced at different latencies and/or through different reprocessing with refined input data. Note that L2_LR_SSH does not include SSH data from the SWOT nadir altimeter. The SWOT L2_LR_SSH product is organized in four files, the L2_LR_SSH ['Unsmoothed'] is described in this metadata sheet. The 3 other file types (['Basic'], ['WindWave'], ['Expert']) are described by 3 different metadata sheets that can be accessed via the links below. The ['Unsmoothed'] file, also intended for expert users, is provided on a finer 'native' grid of 250-m (with minimal smoothing applied), and has a significantly larger data volume than the other files. The ['Basic'] file is intended for users who are interested in SSH measurements and who will use the KaRIn measurements as provided. The ['WindWave'] file is intended for users interested in wind and wave information. The ['Expert'] file is intended for expert users who are interested in the details of how the KaRIn measurements were derived and who may use detailed information for their own custom processing. The ['Unsmoothed'] L2_LR_SSH includes sea surface height (SSH) and sigma0 without additional smoothing relative to the native KaRIn downlink resolution on a ~250 m native (center-beam) grid. The Unsmoothed file contains two groups, left and right, each of which contains the data for half (one side from nadir) of the KaRIn swath. May 2025: v3.0 (version D) Production and distribution of the L2_LR_SSH version D products: - PID0 for forward-processed version D products: from May 6, 2025 onward, - PGD0 for reprocessed version D products: from March 30 to July 10, 2023 (phase CalVal) and from July 26, 2023 to May 19, 2025 (phase Science) is ongoing. August 2024: v2.0 (version D) L2_LR_SSH version C products declared as validated by the SWOT project. March 2024: v2.0 (version C) Production and distribution of the pre-validated L2_LR_SSH version C products: - PIC0 for forward-processed version C products: November 23, 2023 to present, - PGC0 for reprocessed version C products: from March 30 to July 10, 2023 (phase CalVal) and from July 26, 2023 to January 25, 2024 (phase Science) November 2023: v1.0 The beta pre-validated L2_LR_SSH version 1.0 product (summer 2023 reprocessing release) is available only for the 1-day CalVal orbit phase, from March 29 to July 10, 2023, and the 21-day Science orbit phase from September 7 to November 21, 2023. CDS-AVISO accepted Helpdesk AVISO-SWOT aviso-swot@altimetry.fr pointOfContact CDS-AVISO distributor CNES funder https://sextant.ifremer.fr/geonetwork/srv/api/records/63866260-7062-44fd-b202-66c9ea81a683/attachments/L2_LR_SSH.png Oceanographic geographical features Oceanographic geographical features Caractéristiques géographiques océanographiques GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 2018-01-01 publication 2018-07-27T14:39:48 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Sea Surface Topography Sea Surface Topography Topographie de la surface de la mer Cersat - Parameter Cersat - Parameter 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_parameter SWOT SWOT SWOT Cersat - Project Cersat - Project 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_project Less than 4 days Less than 4 days Moins de 4 jours Cersat - Latency Cersat - Latency 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_latency /Sea Surface Topography/Sea Surface Height /Sea Surface Topography/Sea Surface Height Cersat - GCMD parameter Cersat - GCMD parameter 2024-01-04 publication geonetwork.thesaurus.external.theme.GCMDparameter CDS-AVISO CDS-AVISO CDS-AVISO Centre de données ODATIS Centre de données ODATIS 2026-01-19 publication geonetwork.thesaurus.local.theme.odatis_centre_donnees /Observational data/satellite /Observational data/satellite /Données d'observation/satellite Type de jeux de donnée ODATIS Type de jeux de donnée ODATIS 2025-12-09 publication geonetwork.thesaurus.local.theme.type_jeux_donnee Currents Currents Courants Sea surface height Sea surface height Hauteur de la surface de la mer Tides Tides Marées ODATIS aggregation parameters and Essential Variable names ODATIS aggregation parameters and Essential Variable names 2024-09-16 publication 2024-09-16 publication geonetwork.thesaurus.external.theme.NVS.OD1 Update Update None None Open Licence Open Licence Licence Ouverte “The SWOT L2_LR_SSH data product is produced and made freely available by the joint SWOT (NASA/JPL and CNES) project. L2_LR_SSH product quality is not final and will be affected by some evolutions as the SWOT project team makes progress on science data processing algorithms and instrument calibrations”. SWOT project, 2023. SWOT Level-2 KaRIn Low Rate SSH Unsmoothed (version D) [Data set]. CNES. https://doi.org/10.24400/527896/A01-2023.016. “The SWOT L2_LR_SSH data product is produced and made freely available by the joint SWOT (NASA/JPL and CNES) project. L2_LR_SSH product quality is not final and will be affected by some evolutions as the SWOT project team makes progress on science data processing algorithms and instrument calibrations”. SWOT project, 2023. SWOT Level-2 KaRIn Low Rate SSH Unsmoothed (version D) [Data set]. CNES. https://doi.org/10.24400/527896/A01-2023.016. aa2927ad-d1d6-4867-89d3-1311bc11e6bb 2652e825-9ade-435c-afdd-eb920d01b018 681332a5-4b44-48cb-a28c-023962b21d83 83cca913-392b-4b65-ae34-d9d69d043e46 2652e825-9ade-435c-afdd-eb920d01b018 grid 250 oceans -180.00 180.00 -80.00 80.00 2023-03-29 pass L2 NetCDF NetCDF 4 https://github.com/SWOT-community/CNES-AVISO https://github.com/SWOT-community/CNES-AVISO WWW:LINK Software Tutorials, notebooks, GitHub SWOT community Tutorials, notebooks, GitHub SWOT community https://www.aviso.altimetry.fr/en/missions/current-missions/swot/orbit.html https://www.aviso.altimetry.fr/en/missions/current-missions/swot/orbit.html WWW:LINK Other document AVISO SWOT Orbit files (kml and shapefile) for the 1-day and 21-day orbits AVISO SWOT Orbit files (kml and shapefile) for the 1-day and 21-day orbits https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/web-misc/swot_mission_docs/pdd/D-56407_SWOT_Product_Description_L2_LR_SSH_20220902_RevA.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/web-misc/swot_mission_docs/pdd/D-56407_SWOT_Product_Description_L2_LR_SSH_20220902_RevA.pdf WWW:LINK User guide User Guide L2 KaRIn LR SSH product User Guide L2 KaRIn LR SSH product https://podaac.jpl.nasa.gov/swot https://podaac.jpl.nasa.gov/swot WWW:LINK Other document PODAAC website PODAAC website https://tds-odatis.aviso.altimetry.fr/thredds/catalog/L2/L2-SWOT-DATA/dataset-l2-swot-karin-lr-ssh-validated.html https://tds-odatis.aviso.altimetry.fr/thredds/catalog/L2/L2-SWOT-DATA/dataset-l2-swot-karin-lr-ssh-validated.html WWW:LINK SWOT L2_LR_SSH Unsmoothed THREDDS THREDDS THREDDS https://doi.org/10.24400/527896/a01-2023.016 https://doi.org/10.24400/527896/a01-2023.016 https://doi.org/10.24400/527896/a01-2023.016 DOI Digital Object Identifier (DOI) V0.3 2023-12-22