CATDS-PDC L3OS 2P - Daily valid ocean salinity values product from SMOS satellite

This product is an intermediate product, that provides, in daily files, SSS with qualification flags (associated confidence classes) which allow selecting valid data before averaging. Ascending and descending orbits are processed separately

** This product is no longer available, see below **

 
Citation proposal
CATDS (2017) . CATDS-PDC L3OS 2P - Daily valid ocean salinity values product from SMOS satellite. CATDS (CNES, IFREMER, LOCEAN) https://services.mspdata.eu:/geonetwork/srv/api/records/77edd308-4296-4774-b6f3-5b38301cee18

Simple

Date ( Publication )
2017-05-24
Date
Identifier
CATDS-PDC_L3OS_2P
Identifier
DOI:10.12770/77edd308-4296-4774-b6f3-5b38301cee18
Credit
CATDS (CNES, IFREMER, LOCEAN)

  Author

  Principal investigator

  Publisher

Thèmes Sextant ( Theme )
  • /Imagery/Satellite Imagery
GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Orthoimagery
Keywords ( Theme )
  • SMOS , CATDS , CPDC , L3OS , Ocean Salinity , 2P , Ocean Product
Use limitation
Creative Commons license to apply : Attribution (BY) : http://creativecommons.org/licenses/?lang=en
Access constraints
License
Use constraints
License
Other constraints
Spatial representation type
Grid
Denominator
1
Metadata language
English
Character set
UTF8
Topic category
  • Geoscientific information
N
S
E
W


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
false
Distribution format
  • NetCDF (netcdf 3 with 64 bit offset option )

OnLine resource
ATBD L3OS  

Algorithm Theoretical Basis Document L3OS

OnLine resource
Pros/cons table  
OnLine resource
CATDS Sipad  

CATDS Sipad - Web-based interactive tool which allows subsettings and temporal agregation.

OnLine resource
CATDS Web portal  

CATDS Web portal

OnLine resource
DOI of the dataset  

DOI of the dataset

Hierarchy level
Dataset
Statement

This product is no longer available. Instead, we recommend to use the product CATDS-PDC L3OS 2Q - Debiased daily valid ocean salinity values product from SMOS satellite (https://doi.org/10.12770/12dba510-cd71-4d4f-9fc1-9cc027d128b0). However, if the L3OS 2Q product doesn't fit your need, and you really need access to the L3OS 2P product, please send us a message with the appropriate justification at support@catds.fr.

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 from ESA (European Space Agency).

From these, brightness temperatures at various incidence angles are reconstructed. The Sea Surface Salinity (SSS) are retrieved from multi-angular brightness temperatures through a maximum likehood Bayesian approach in which measured Tb and Tb simulated using a forward direct model are compared (see Zine et al. 2008 for a general description of the retrieval method, and pro_con table for a summary of the similarities/differences with respect to ESA level 2 ocean salinity processing).

The L3OS 2P product is an intermediate product, that provides, in daily files, SSS with qualification flags (associated confidence classes) which allow selecting valid data before averaging. Ascending and descending orbits are processed separately.

Products from reprocessing RE05 are available for the period 01/2010 - 03/2017. Products from operational (OPER) processing are available since 04/2017. Reprocessed products and operational products are derived using the same algorithm and configuration, hence ensuring the temporal continuity.

Note that Dual Polarisation (DP) configuration was used only during the commissioning phase (CP ; 01/2010 - 05/2010), alternately to Full Polarisation (FP) configuration.In order to ensure similar number of retrievals and errors on SSS maps during CP and after CP, DP and FP maps need to be averaged.

File naming :

SM_clas_MIR_CSp2Px_startdate_enddate_vvv_ccc_7

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

- p : F for full polarization, D for dual polarization

- 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)

Reference :

Zine, S., J. Boutin, J. Font, N. Reul, P. Waldteufel, C. Gabarró, J. Tenerelli, F. Petitcolin, J. L. Vergely, M. Talone, and S. Delwart (2008), Overview of the SMOS sea surface salinity prototype processor, IEEE T. Geosci. Remote Sensing, 46, 621-645.

Metadata

File identifier
77edd308-4296-4774-b6f3-5b38301cee18   XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2019-10-14T16:55:58
Metadata standard name
ISO 19115:2003/19139 - SEXTANT
Metadata standard version
1.0

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