de48c5b5-18f7-4829-ba0e-78f3dff047ac AVISO aviso@altimetry.fr editor 2026-04-22T16:12:25.288383Z 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-3 Low Rate SSH - Unsmoothed Altimetry product SWOT Level-3 Low Rate SSH - Unsmoothed Produit altimétrique SWOT Niveau 3 Low Rate SSH - Unsmoothed 2024-06-26 creation 2024-07-05 lastUpdate 2025-03-15 lastUpdate 2024-10-18 lastUpdate A01-2024.003 v2.0.1 The SWOT L3_LR_SSH product provides ocean topography measurements obtained from the SWOT KaRIn and nadir altimeter instruments, merged into a single variable. The dataset includes measurements from KaRIn swaths on both sides of the image, while the measurements from the nadir altimeter are located in the central columns. In the areas between the nadir track and the two KaRIn swaths, as well as on the outer edges of each swath (restricted to cross-track distances ranging from 10 to 60 km), default values are expected. SWOT L3_LR_SSH is a cross-calibrated product from multiple missions that contains only the ocean topography content necessary for thematic research (e.g., oceanography, geodesy) and related applications. This product is designed to be simple and ready-to-use, and can be combined with other altimetry missions. The SWOT L3_LR_SSH product is a research-orientated extension of the L2_LR_SSH product, distributed by the SWOT project (NASA/JPL and CNES). SWOT L3_LR_SSH is managed by the SWOT Science Team project DESMOS. The ['Unsmoothed'] version of SWOT L3_LR_SSH (the "Basic" and "Expert" versions are the subject of separate metadata sheets) includes each algorithm, correction, or external model incorporated into the SWOT L3_LR_SSH product as a separate layer. This ['Unsmoothed'] version which includes the MSS, MDT and geostrophic currents (absolute and anomalies) in addition to the SSHA and MDT on the 250 m KaRIn native grid. Like the Expert subproduct, it also integrates a quality flag, corrections and external models as separate layers. CDS-AVISO onGoing Helpdesk AVISO-SWOT aviso-swot@altimetry.fr pointOfContact CDS-AVISO distributor CNES/CLS originator CNES funder https://sextant.ifremer.fr/geonetwork/srv/api/records/de48c5b5-18f7-4829-ba0e-78f3dff047ac/attachments/2023_SWOT_L3_logo.png Oceanographic geographical features Oceanographic geographical features Caractéristiques géographiques océanographiques GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 2018-07-27T14:39:48 publication 2018-07-27 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 1 month 1 month 1 mois 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 /Ocean Circulation/Ocean Currents /Ocean Circulation/Ocean Currents /Tides/Tidal Height /Tides/Tidal 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 Sea surface height Sea surface height Hauteur de la surface de la mer Currents Currents Courants Tides Tides Marées ODATIS aggregation parameters and Essential Variable names ODATIS aggregation parameters and Essential Variable names 2025-07-29 publication geonetwork.thesaurus.external.theme.NVS.OD1 L3 L3 L3 Cersat - Processing level Cersat - Processing level 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_processing_level Level 3 Level 3 Level 3 Processing level Processing level 2025-12-09 publication geonetwork.thesaurus.local.processing-level.myocean.processing-level Update Update None None Open Licence Open Licence Licence Ouverte "The SWOT L3_LR_SSH product, derived from the L2 SWOT KaRIn low rate ocean data products (NASA/JPL and CNES), is produced and made freely available by AVISO and DUACS teams as part of the DESMOS Science Team project". AVISO/DUACS, 2024. SWOT Level-3 KaRIn Low Rate SSH Unsmoothed (v2.0.1) [Data set]. CNES. https://doi.org/10.24400/527896/A01-2024.003. "The SWOT L3_LR_SSH product, derived from the L2 SWOT KaRIn low rate ocean data products (NASA/JPL and CNES), is produced and made freely available by AVISO and DUACS teams as part of the DESMOS Science Team project". AVISO/DUACS, 2024. SWOT Level-3 KaRIn Low Rate SSH Unsmoothed (v2.0.1) [Data set]. CNES. https://doi.org/10.24400/527896/A01-2024.003. aa2927ad-d1d6-4867-89d3-1311bc11e6bb 8c961685-cecb-41d9-b2d9-2a22cdd3d0c2 785031bd-c54f-4a9b-a10e-7f76df114481 grid 250 oceans -180.00 180.00 -80.00 80.00 2023-03-30 2025-03-09 pass L3 NetCDF NetCDF 4 https://tds-odatis.aviso.altimetry.fr/thredds/catalog/L3/SWOT_KARIN-L3_LR_SSH.html https://tds-odatis.aviso.altimetry.fr/thredds/catalog/L3/SWOT_KARIN-L3_LR_SSH.html WWW:LINK SWOT L3_LR_SSH Unsmoothed THREDDS THREDDS THREDDS https://swotst.aviso.altimetry.fr/fileadmin/user_upload/SWOTST2023/postersPI/faugere_ocean_l3_PIproject.pdf https://swotst.aviso.altimetry.fr/fileadmin/user_upload/SWOTST2023/postersPI/faugere_ocean_l3_PIproject.pdf WWW:LINK Other document Poster at SWOT Science Team 2023, Dibarboure et al. SWOT Level-3 Overview algorithms and examples Poster at SWOT Science Team 2023, Dibarboure et al. SWOT Level-3 Overview algorithms and examples https://swotst.aviso.altimetry.fr/fileadmin/user_upload/SWOTST2023/20230920_ocean_2_regional_calval/16h30-Dibarboure_level3.pdf https://swotst.aviso.altimetry.fr/fileadmin/user_upload/SWOTST2023/20230920_ocean_2_regional_calval/16h30-Dibarboure_level3.pdf WWW:LINK Other document Presentation at SWOT Science Team 2023, Dibarboure et al. SWOT Level-3 Overview algorithms and examples Presentation at SWOT Science Team 2023, Dibarboure et al. SWOT Level-3 Overview algorithms and examples https://swot-community.github.io/SWOT-galleries/cnes.html https://swot-community.github.io/SWOT-galleries/cnes.html WWW:LINK Software SWOT Ocean data tutorials SWOT Ocean data tutorials 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://www.aviso.altimetry.fr/fileadmin/documents/data/tools/hdbk_duacs_SWOT_L3.pdf https://www.aviso.altimetry.fr/fileadmin/documents/data/tools/hdbk_duacs_SWOT_L3.pdf WWW:LINK User guide Product User Manual (handbook) Product User Manual (handbook) Guide utilisateur (handbook) https://www.aviso.altimetry.fr/fileadmin/documents/data/tools/KaRIn_L3_v2content_20250115.pdf https://www.aviso.altimetry.fr/fileadmin/documents/data/tools/KaRIn_L3_v2content_20250115.pdf WWW:LINK Product notices SWOT L3_LR_SSH product: planned changes, rationale, expected improvements and known issues SWOT L3_LR_SSH product: planned changes, rationale, expected improvements and known issues https://doi.org/10.5194/os-21-283-2025 https://doi.org/10.5194/os-21-283-2025 https://doi.org/10.5194/os-21-283-2025 WWW:LINK-1.0-http--publication-URL Main publication link Dibarboure, G., Anadon, C., Briol, F., Cadier, E., Chevrier, R., Delepoulle, A., Faugère, Y., Laloue, A., Morrow, R., Picot, N., Prandi, P., Pujol, M.-I., Raynal, M., Tréboutte, A., and Ubelmann, C.: Blending 2D topography images from the Surface Water and Ocean Topography (SWOT) mission into the altimeter constellation with the Level-3 multi-mission Data Unification and Altimeter Combination System (DUACS), Ocean Sci., 21, 283–323 Dibarboure, G., Anadon, C., Briol, F., Cadier, E., Chevrier, R., Delepoulle, A., Faugère, Y., Laloue, A., Morrow, R., Picot, N., Prandi, P., Pujol, M.-I., Raynal, M., Tréboutte, A., and Ubelmann, C.: Blending 2D topography images from the Surface Water and Ocean Topography (SWOT) mission into the altimeter constellation with the Level-3 multi-mission Data Unification and Altimeter Combination System (DUACS), Ocean Sci., 21, 283–323 Dibarboure, G., Anadon, C., Briol, F., Cadier, E., Chevrier, R., Delepoulle, A., Faugère, Y., Laloue, A., Morrow, R., Picot, N., Prandi, P., Pujol, M.-I., Raynal, M., Tréboutte, A., and Ubelmann, C.: Blending 2D topography images from the Surface Water and Ocean Topography (SWOT) mission into the altimeter constellation with the Level-3 multi-mission Data Unification and Altimeter Combination System (DUACS), Ocean Sci., 21, 283–323 https://doi.org/10.24400/527896/A01-2024.003 https://doi.org/10.24400/527896/A01-2024.003 https://doi.org/10.24400/527896/A01-2024.003 DOI Digital Object Identifier (DOI) Production and distribution of the Unsmoothed SWOT L3_LR_SSH (250-m) version 1.0 product derived from the L2_LR_SSH version C for the Calibration (cycles 474 - 578) phase only. Production and distribution of the Unsmoothed SWOT L3_LR_SSH (250-m) version 1.0 product derived from the L2_LR_SSH version C for the Calibration (cycles 474 - 578) phase only. v1.0 2024-06-14 Updated product with the release of version 1.0.1 (also derived from L2_LR_SSH version C) to correct an inverted land/sea mask anomaly for both the Calibration (cycles 474 - 578) phase and the Science (cycles 1 - 6 only) phases. Updated product with the release of version 1.0.1 (also derived from L2_LR_SSH version C) to correct an inverted land/sea mask anomaly for both the Calibration (cycles 474 - 578) phase and the Science (cycles 1 - 6 only) phases. v1.0.1 2024-07-25 Updated product with the release of version 1.0.2 (also derived from L2_LR_SSH version C) for both the Calibration (cycles 474 - 578) phase and the Science (cycles 1 - 16 only) phases. Updated product with the release of version 1.0.2 (also derived from L2_LR_SSH version C) for both the Calibration (cycles 474 - 578) phase and the Science (cycles 1 - 16 only) phases. v1.0.2 2024-10-18 Updated product with the release of version 1.0.2 (also derived from L2_LR_SSH version C) for both the Calibration (cycles 474 - 578) phase and the Science (cycle 1 - ongoing) phases. Updated product with the release of version 1.0.2 (also derived from L2_LR_SSH version C) for both the Calibration (cycles 474 - 578) phase and the Science (cycle 1 - ongoing) phases. v2.0.1 2025-03-15