316e77af-cb72-4312-96a3-3011cc5068d4 Tarot Stephane IFREMER 02 98 22 40 55 Centre Bretagne - ZI de la Pointe du Diable - CS 10070 - 29280 Plouzané Brest France Stephane.Tarot@ifremer.fr pointOfContact 2026-01-16T12:10:50.389617Z ISO 19115-3 - SEXTANT 1.0 3 1388 584 14 false WGS 84 / NSIDC EASE-Grid 2.0 Global (EPSG:6933) EPSG 8.6 CATDS-PDC L4SM RZSM - 1 day global map of root zone soil moisture values from SMOS satellite 2022-12-07 publication CATDS-PDC_L4SM_RZSM DOI:10.12770/316e77af-cb72-4312-96a3-3011cc5068d4 This product is a daily product of root zone soil moisture representative of the 0-1 m depth of the soil. CATDS (CNES, IFREMER, CESBIO) CATDS support@catds.fr author Yann Kerr CESBIO yann.kerr@cnes.fr principalInvestigator CATDS (CNES, IFREMER, CESBIO) support@catds.fr publisher https://sextant.ifremer.fr/geonetwork/srv/api/records/316e77af-cb72-4312-96a3-3011cc5068d4/attachments/RZSM.png https://sextant.ifremer.fr/geonetwork/srv/api/records/9cef422f-ed3f-4090-9556-b2e895ba2ca8/attachments/SM_1day_asc.png /Imagery/Satellite Imagery Thèmes Sextant 2025-12-09 publication geonetwork.thesaurus.local.theme.sextant-theme Orthoimagery GEMET - INSPIRE themes, version 1.0 2018-07-27T14:39:48 publication 2018-07-27 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme SMOS CATDS CPDC L3SM Soil Moisture Filtered Land Product RZSM Root Zone Soil Moisture Humidity ODATIS aggregation parameters and Essential Variable names 2025-07-29 publication geonetwork.thesaurus.external.theme.NVS.OD1 /Observational data/satellite Type de jeux de donnée ODATIS 2025-12-09 publication geonetwork.thesaurus.local.theme.type_jeux_donnee Project name 2025-12-09 publication geonetwork.thesaurus.local.theme.emodnet-bathymetry.projectname Creative Commons license to apply : Attribution (BY) : http://creativecommons.org/licenses/?lang=en grid 1 utf8 geoscientificInformation -180.00 180.00 -83.50 83.50 2010-01-17 NetCDF netcdf 3 with 64 bit offset option https://data.catds.fr/cpdc/Land_products/GRIDDED/L4SM/OPER/MIR_CLF4RD WWW:DOWNLOAD OPER-DESC OPER-DESC - Operational products (06/2021 - now), descending orbits https://doi.org/10.12770/316e77af-cb72-4312-96a3-3011cc5068d4 DOI DOI of the dataset DOI of the dataset http://doi.org/10.5281/zenodo.4298572 WWW:LINK-1.0-http--publication-URL Reference Al Bitar Ahmad, & Mahmoodi Ali. (2020, November 30). Algorithm Theoretical Basis Document (ATBD) for the SMOS Level 4 Root Zone Soil Moisture (Version v30_01). Zenodo. http://doi.org/10.5281/zenodo.4298572 ; ftp://ftp.ifremer.fr/ WWW:DOWNLOAD FTP Access FTP Access - All products are also available by ftp : server ftp.ifremer.fr, login ext-catds-cpdc, passwd catds2010, path Land_products/GRIDDED/... (same relative paths as the https links) https://data.catds.fr/cpdc/Land_products/GRIDDED/L4SM/OPER/MIR_CLF4RA WWW:DOWNLOAD OPER-ASC OPER-ASC - Operational products (06/2021 - now), ascending orbits https://data.catds.fr/cpdc/Land_products/GRIDDED/L4SM/RE07/MIR_CLF4RA WWW:DOWNLOAD RE07-ASC RE07-ASC - Reprocessed products (01/2010 - 05/2021), ascending orbits https://data.catds.fr/cpdc/Land_products/GRIDDED/L4SM/RE07/MIR_CLF4RD WWW:DOWNLOAD RE07-DESC RE07-DESC - Reprocessed products (01/2010 - 05/2021), descending orbits https://doi.org/10.1109/ACCESS.2024.3404123 WWW:LINK-1.0-http--publication-URL Publication N. Ojha, A. Mahmoodi, A. Mialon, P. Richaume, S. Ferrant and Y. H. Kerr, "Assessment of SMOS Root Zone Soil Moisture: A Comparative Study Using SMAP, ERA5, and GLDAS," in IEEE Access, vol. 12, pp. 76121-76132, 2024, https://doi.org/10.1109/ACCESS.2024.3404123 ; https://www.catds.fr/ WWW:LINK CATDS Web portal CATDS Web portal The base products, for all the CATDS-PDC (Centre Aval de Traitement des Données SMOS - Production & Dissemination Center) processing chains, are the SMOS L1B products - https://doi.org/10.57780/SM1-e20cf57 - from ESA (European Space Agency). The L4SM RZSM is the daily product of root zone soil moisture (m3/m3) representative of the 0-1 m depth of the soil. The product contains also a quality index taking into account the presence of Radio Frequency Interference (RFI), low quality of retrieval of the input surface soil moisture, and a high fraction of non-nominal surfaces. Products from reprocessing RE07 are available for the period 01/2010 - 05/2021. Products from operational (OPER) processing are available since 06/2021. Reprocessed products and operational products are derived using the same algorithm and configuration, hence ensuring the temporal continuity. File naming : SM_clas_MIR_CLF4Rx_startdate_enddate_vvv_ccc_7 - clas : File class (OPER : operational mode, REXX : reprocessing xx) - x : A for ascending orbit, D for descending orbit - startdate : sensing start date/time of the data (format yyyymmddThhmiss) - enddate : sensing end date/time of the data (format yyyymmddThhmiss) - vvv : version number of the processor generating the product - ccc : file counter File format : In each archive file (.tgz extension), there are two files - A Header file (.HDR), which is a text file, in XML Earth Explorer Header format - A Data file (.DBL.nc), which is a netcdf file, format variant 2 (netcdf 3 with 64 bits offset option)