CATDS-PDC L3TB - Global polarised brightness temperature product from SMOS satellite

This product is a synthesis product of brightness temperatures for L-Band frequency. It includes all brightness temperatures acquired that very day by the SMOS satellite operating in full pol mode. Values correspond to those at the top of the atmosphere level, transformed to the ground polarisation reference frame, binned and averaged into fixed incidence angle classes. This product is available on each of the EASE2 grid projections (cylindrical and polar).

Date (Publication): 2024-06-11

Identifier: CATDS-PDC_L3TB

Identifier: DOI:10.12770/6294e08c-baec-4282-a251-33fee22ec67f

Credit: CATDS (CNES, IFREMER, CESBIO)

Author

CATDS

Principal investigator

CESBIO - Arnaud Mialon

Publisher

CATDS (CNES, IFREMER, CESBIO)

Thèmes Sextant

/Imagery/Satellite Imagery

GEMET - INSPIRE themes, version 1.0

Oceanographic geographical features

Theme

SMOS
CATDS
CPDC
L3TB
Brightness Temperature
Common Product

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: 2010-01-12

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: CYL-RE07-ASC ( WWW:DOWNLOAD )
CYL-RE07-ASC - Reprocessed products (01/2010 - 05/2021), cylindrical projection, ascending orbits

OnLine resource: CYL-RE07-DESC ( WWW:DOWNLOAD )
CYL-RE07-DESC - Reprocessed products (01/2010 - 05/2021), cylindrical projection, descending orbits

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

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

OnLine resource: POL-OPER-NORTH ( WWW:DOWNLOAD )
POL-OPER-NORTH - Operational products (06/2021 - now), polar projection, north hemisphere

OnLine resource: POL-RE07-SOUTH ( WWW:DOWNLOAD )
POL-RE07-SOUTH - Reprocessed products (01/2012 - 05/2021), polar projection, south hemisphere

OnLine resource: POL-OPER-SOUTH ( WWW:DOWNLOAD )
POL-OPER-SOUTH - Operational products (06/2021 - now), polar projection, south hemisphere

OnLine resource: POL-RE07-NORTH ( WWW:DOWNLOAD )
POL-RE07-NORTH - Reprocessed products (01/2012 - 05/2021), polar projection, north hemisphere

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 Common_products/GRIDDED/... (same paths as in above https links)

OnLine resource: SMOS Level 3 Brightness Temperature (TB) Users’manual and useful tips Quality assessment flags ( WWW:LINK )

OnLine resource: POL-RE08-NORTH ( WWW:DOWNLOAD )
POL-RE08-NORTH - Reprocessed products (01/2010 - 12/2011), polar projection, north hemisphere

OnLine resource: POL-RE08-SOUTH ( WWW:DOWNLOAD )
POL-RE08-SOUTH - Reprocessed products (01/2010 - 115/2011), polar projection, north hemisphere

OnLine resource: CATDS Sipad ( WWW:LINK )
CATDS Sipad - Web-based interactive tool which allows subsettings and temporal agregation.

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

OnLine resource: Reference ( WWW:LINK-1.0-http--publication-URL )
Al Bitar Ahmad, Mialon Arnaud, Kerr Yann H., Cabot Francois, Richaume Philippe, Jacquette Elsa, Quesney Arnaud, Mahmoodi Ali, Tarot Stephane, Parrens Marie, Al-Yaari Amen, Pellarin Thierry, Rodriguez-Fernandez Nemesio, Wigneron Jean-Pierre (2017). The global SMOS Level 3 daily soil moisture and brightness temperature maps. Earth System Science Data, 9(1), 293-315. Publisher's official version : http://doi.org/10.5194/essd-9-293-2017 , Open Access version : http://archimer.ifremer.fr/doc/00388/49941/

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

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 L3TB product includes all brightness temperatures from SMOS satellite acquired that day, at top of atmosphere level, transformed to ground polarisation reference frame, filtered when several acquisitions are available, and binned and averaged into fixed incidence angle classes (including a 40° incidence angle, to ease the comparison with SMAP data). This product is available on each of the EASE2 grid projections (cylindrical and polar).

For the cylindrical projection : Ascending and descending orbits are processed separately, and only in full polarisation. For the polar projections : Each orbit (equator to equator) is processed separately.

Products from reprocessing RE08 are available for the period 01/2010 - 03/2024. Products from operational (OPER) processing are available since 04/2024. Reprocessed products and operational products are derived using the same algorithm and configuration, hence ensuring the temporal continuity.

In this product, the brightness temperature values potentially contaminated by RFI or by the sun are not removed from the data. Instead, 2 counter fields (Nb_RFI_Flags and NB_SUN_Flags) are present, in order to count the number of views identified as contaminated. Therefore a low counter value means a low probability of contamination, and a high counter value means a high probability of contamination.

File naming :

SM_clas_MIR_CDF3Tx_startdate_enddate_vvv_ccc_7

- clas : File class (OPER : operational mode, REXX : reprocessing xx)

- x : A for ascending orbit, D for descending orbit, N for north pole, S for south pole

- 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)

Reference :

Al Bitar Ahmad, Mialon Arnaud, Kerr Yann H., Cabot Francois, Richaume Philippe, Jacquette Elsa, Quesney Arnaud, Mahmoodi Ali, Tarot Stephane, Parrens Marie, Al-Yaari Amen, Pellarin Thierry, Rodriguez-Fernandez Nemesio, Wigneron Jean-Pierre (2017). The global SMOS Level 3 daily soil moisture and brightness temperature maps. Earth System Science Data, 9(1), 293-315. Publisher's official version : http://doi.org/10.5194/essd-9-293-2017 , Open Access version : http://archimer.ifremer.fr/doc/00388/49941/

File identifier: 6294e08c-baec-4282-a251-33fee22ec67f XML

Metadata language: English

Character set: UTF8

Hierarchy level: Dataset

Date stamp: 2025-05-15T22:38:25.970076Z

Metadata standard name: ISO 19115-3 - SEXTANT

Metadata standard version: 1.0

Point of contact

IFREMER - Tarot Stephane

Centre Bretagne - ZI de la Pointe du Diable - CS 10070 - 29280 Plouzané , Brest , France

02 98 22 40 55

Overviews

Spatial extent

Provided by

Access to the portal

Read here the full details and access to the data.

Associated resources

Not available

Simple

Overviews

Spatial extent

Keywords

Provided by

Associated resources