CATDS-PDC L4SM RZSM - 1 day global map of root zone soil moisture values from SMOS satellite

This product is a daily product of root zone soil moisture representative of the 0-1 m depth of the soil.

Date (Publication): 2022-12-07

Identifier: CATDS-PDC_L4SM_RZSM

Identifier: DOI:10.12770/316e77af-cb72-4312-96a3-3011cc5068d4

Credit: CATDS (CNES, IFREMER, CESBIO)

Author

CATDS

Principal investigator

CESBIO - Yann Kerr

Publisher

CATDS (CNES, IFREMER, CESBIO)

Thèmes Sextant

/Imagery/Satellite Imagery

GEMET - INSPIRE themes, version 1.0

Orthoimagery

Theme

SMOS
CATDS
CPDC
L3SM
Soil Moisture
Filtered
Land Product
RZSM
Root Zone Soil Moisture

Use limitation: Creative Commons license to apply : Attribution (BY) : http://creativecommons.org/licenses/?lang=en

Access constraints: License

Use constraints: License

Spatial representation type: grid Grid

Denominator: 1

Metadata language: English

Character set: utf8 UTF8

Topic category

Geoscientific information

Begin date: 2010-01-17

Reference system identifier: EPSG / WGS 84 / NSIDC EASE-Grid 2.0 Global (EPSG:6933) / 8.6

Number of dimensions: 3

Dimension name: Column

Dimension size: 1388

Dimension name: Vertical

Dimension size: 584

Dimension name: Sample

Dimension size: 14

Cell geometry: Area

Transformation parameter availability: No

Distribution format

NetCDF ( netcdf 3 with 64 bit offset option )

OnLine resource: OPER-DESC ( WWW:DOWNLOAD )
OPER-DESC - Operational products (06/2021 - now), descending orbits

OnLine resource: ATBD L4SM RZSM ( WWW:LINK )

OnLine resource: DOI of the dataset ( DOI )
DOI of the dataset

OnLine resource: Reference ( WWW:LINK-1.0-http--publication-URL )
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 ;

OnLine resource: FTP Access ( WWW:DOWNLOAD )
FTP Access - All products are also available by ftp : server ftp.ifremer.fr, login ext-catds-cpdc, passwd catds2010, path Land_products/GRIDDED/... (same paths as in above https links)

OnLine resource: OPER-ASC ( WWW:DOWNLOAD )
OPER-ASC - Operational products (06/2021 - now), ascending orbits

OnLine resource: RE07-ASC ( WWW:DOWNLOAD )
RE07-ASC - Reprocessed products (01/2010 - 05/202), ascending orbits

OnLine resource: RE07-DESC ( WWW:DOWNLOAD )
RE07-DESC - Reprocessed products (01/2010 - 05/202), descending orbits

OnLine resource: Publication ( WWW:LINK-1.0-http--publication-URL )
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 ;

OnLine resource: CATDS Web portal ( WWW:LINK )
CATDS Web portal

Hierarchy level: Dataset

Statement: 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)