69d1b17d-78ab-44d2-b2fe-cf1a655d03c6 CERSAT Exploitation fpaf@ifremer.fr editor 2026-06-24T09:11:50.899163Z ISO 19115-3:2018 - Remote Sensing http://www.opengis.net/def/crs/EPSG/0/4326 IWWOC Global Ocean Directional Wave Parameters Level 2S from SWIM onboard CFOSAT version 2 2026-01-01 creation 2026-01-01 publication v2 IWWOC_SWI_L2S___ The main objective of the SWIM Level 2S (L2S) product is to provide along-track directional wave spectra measures, as well as the integrated parameters of the associated wave systems (wave length, significant wave height, direction), over the global ocean, as observed with SWIM instrument onboard CFOSAT. CFOSAT (Chinese French Ocean SATellite) is a french-chinese mission launched in 2018, whose aim is to provide wind (SCAT instrument) and wave (SWIM instrument) measurements over the sea surface. The wave spectra and their associated partitions are provided independently for each SWIM incidence (from 2° to 10°), together with the sigma0 resampled at a 20m resolution. They are complemented with information from the nadir beam such as the sigma0, wind speed, significant wave height or rain flag. The SWIM level 2S (L2S) product is generated in delayed mode, a few days after acquisition. It complements the Near-Real Time (NRT) L2 product delivered by the CWWIC center by providing an alternative and evolutive processing to test and implement quickly new algorithms for the wave inversion over the whole mission archive. These evolutions may take advantage of better ancillary data not available in NRT (ice mask product, best estimates of wind or wave model), of the combination with wind measurements from the onboard SCAT scatterometer. The product is also designed to handle complex situations such as coastal areas and heterogeneous seas. These complex situations are by nature of particular scientific interest (e.g. wind wave interactions, wave evolution in coastal region). This version 2 improves the previous release in particular through a new empirical modulation transfer function (MTF) and better partitioning. The dataset is also lighter in size. It has been completely reprocessed from SWIM Level 1 archive. Note that the dataset is split on the access server in two different sub-versions (**2.0** for the L2S using Level 1 in OP06 version, **2.1** for the L2S using Level 1 in OP07 version). No major differences are expected. The SWIM L2S product is generated and distributed by Ifremer / CERSAT in the frame of the Ifremer Wind and Wave Operation Center (IWWOC) co-funded by Ifremer and CNES and dedicated to the processing of the delayed mode data of CFOSAT mission. onGoing Gilles Guitton OceanDataLab author CERSAT help desk Ifremer / CERSAT cersat@ifremer.fr pointOfContact Ifremer / CERSAT cersat@ifremer.fr originator Ifremer / CERSAT cersat@ifremer.fr distributor CNES funder Ifremer / CERSAT funder Gilles Guitton OceanDataLab principalInvestigator https://sextant.ifremer.fr/geonetwork/srv/api/records/69d1b17d-78ab-44d2-b2fe-cf1a655d03c6/attachments/CFOSAT_L2S_quicklook.jpg Oceanographic geographical features GEMET - INSPIRE themes, version 1.0 2018-07-27T14:39:48 publication 2018-07-27 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Ocean Waves Cersat - Parameter 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_parameter CFOSAT IWWOC Cersat - Project 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_project Less than 4 days Cersat - Latency 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_latency /Ocean Waves/Swells /Ocean Waves /Ocean Waves/Sea State /Ocean Waves/Wave Speed/Direction /Ocean Waves/Wave Period /Ocean Waves/Wave Spectra Cersat - GCMD parameter 2024-01-04 publication geonetwork.thesaurus.external.theme.GCMDparameter CDS-CERSAT Centre de données ODATIS 2026-01-19 publication geonetwork.thesaurus.local.theme.odatis_centre_donnees Variables ODATIS 2023-10-13 publication 2023-10-13 publication geonetwork.thesaurus.local.theme.odatis_variables /Observational data/satellite Type de jeux de donnée ODATIS 2025-12-09 publication geonetwork.thesaurus.local.theme.type_jeux_donnee Waves ODATIS aggregation parameters and Essential Variable names 2025-07-29 publication geonetwork.thesaurus.external.theme.NVS.OD1 None CC-BY (Creative Commons - Attribution) Ifremer / CERSAT. 2025. Global Ocean Directional Wave Parameters Level 2S from SWIM onboard CFOSAT for IWWOC project. Ver. 1.0. Ifremer, Plouzane, France. Dataset accessed [YYYY-MM-DD]. DOI: https://doi.org/10.12770/69d1b17d-78ab-44d2-b2fe-cf1a655d03c6 grid 70 oceans -180.00 180.00 -90.00 90.00 orbit L2S NetCDF 4 https://data-cersat.ifremer.fr/projects/iwwoc/swi_l2s/ WWW:LINK Ifremer HTTP server HTTP https://gitlab.ifremer.fr/cersat/recipes/-/blob/main/cfosat/opensearch.ipynb WWW:LINK Software Jupyter notebook: searching IWWOC SWIM L2S data files over an area of interest https://gitlab.ifremer.fr/cersat/recipes/-/blob/main/cfosat/l2s_ribbon_map.ipynb WWW:LINK Software Jupyter notebook: reading and displaying IWWOC SWIM L2S data https://doi.org/10.12770/69d1b17d-78ab-44d2-b2fe-cf1a655d03c6 DOI Digital Object Identifier (DOI) Initial version V1.0 2022-01-11