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Introduction

All the three Swarm satellite are equipped with a set of six instruments:

  • ASM - Absolute Scalar Magnetometer
  • VFM - Vector Field Magnetometer
  • STR - Star Tracker
  • EFI - Electric Field Instrument
  • GPSR - GPS Receiver
  • ACC - Accelerometer
Figure 1: Swarm side annotation

Pages from ESA's Magnetic Field Mission Brochure

 
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SMOS data quality reports and technical notes, data verification reports, animated maps for both operational (OPER) and reprocessed (REPR) dataset are available on this page.

The SMOS Monthly Quality report for operational (OPER) dataset provides:

  • summary of the main mission events occurred at flight segment and ground segment impacting the data quality during the reporting period
  • long-term analysis of the evolution of the instrument calibration parameters
  • processors and auxiliary files configuration updates
  • product quality disclaimers

The SMOS Data Quality Control report for reprocessed (REPR) dataset provides:

  • summary of the Data Quality Control analysis performed on the reprocessed dataset
  • long-term analysis of the evolution of selected quality control indicators
  • detailed information regarding data gaps and data degradation into the reprocessed dataset
  • product quality disclaimers

The SMOS Data Verification report for reprocessed (REPR) dataset provides:

  • summary of the results obtained by the Expert Support laboratories to verify the quality of the SMOS level 2 data

To access the reports and the animated maps see the links in the following tables:

SMOS Monthly Quality Reports
2017 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2016 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2015 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2014 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2013 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2012 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2011 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Impact of ECMWF forecast cycle 41r2 on the SMOS level 2 sea surface salinity and soil moisture products

SMOS Mission Reprocessing Reports for the products baseline V6
  Data Quality Control Reports Data Verification Reports
L1 Products L1 V620 QC  
L2 Sea Surface Salinity Product L2 OS V622 QC L2 OS V622
L2 OS V662 QC L2 OS V662
L2 Soil Moisture Product L2 SM V620 QC L2 SM V620
L2 SM V650 QC  

The brightness temperature maps for Land and Sea surface provide an overview of the average weekly signal sensed by SMOS. The maps are derived from the level 1 browse products and are computed for selected Stokes parameters at ascending and descending passes. The data in the maps are not filtered by RFI and other anomalies therefore strong signal corruption can be observed for some period, in some region over the Earth surface. The maps are generated for quality control purposes mainly to check the data coverage and the long term brightness temperature value consistency.

To access the SMOS level 1 maps see the links in the following table:

SMOS Brightness Temperature weekly maps - Land Surface
(since January 2010 onwards)
Ascending Stokes-1 Stokes-3 Stokes-4
Descending Stokes-1 Stokes-3 Stokes-4
SMOS Brightness Temperature weekly maps - Sea Surface
(since January 2010 onwards)
Ascending Stokes-1 Stokes-3 Stokes-4
Descending Stokes-1 Stokes-3 Stokes-4


The soil moisture maps provide an overview of the average weekly soil moisture retrieved from SMOS level 1 brightness temperature. The maps are derived from the level 2 SM products and are computed for ascending and descending passes. The level 1 measurements contaminated by the RFI are filtered out by the level 2 processor. For that reason the data coverage can be impacted in the area affected by permanent RFI sources. The soil moisture retrieval is also impacted by frozen / thawing soil therefore the global coverage of soil moisture data has a seasonal evolution as shown in the maps. The maps are generated for quality control purposes mainly to check the data coverage and the long term soil moisture value consistency.

To access the SMOS level 2 soil moisture maps see the links in the following table:

SMOS Soil Moisture weekly maps
Ascending Soil Moisture
Descending Soil Moisture


The sea surface salinity maps provide an overview of the average weekly sea surface salinity retrieved from SMOS level 1 brightness temperature. The maps are derived from the level 2 OS products and are computed for ascending and descending passes. The level 1 measurements contaminated by the RFI, and instrument anomalies are filtered out by the level 2 processor. The maps show only data retrieved with good quality for the Sea Surface Salinity (SSS) retrieved with and without Land-Sea contamination correction and SSS anomaly based on WOA-2009 referred to Land-Sea corrected SSS. The maps are generated for quality control purposes mainly to check the data coverage and the long term sea surface salinity values consistency.

To access the SMOS level 2 sea surface salinity maps see the links in the following table:

SMOS Sea Surface Salinity weekly maps
Ascending Salinity LSC Salinity Salinity LSC anomaly
Descending Salinity LSC Salinity Salinity LSC anomaly

 


Introduction

Swarm Data Quality Workshops (SDQWs), for which presentations can be downloaded via Swarm DQW FTP site:

  • 3rd SDQW - 3rd Swarm Data Quality Workshop
  • 4th SDQW - 4th Swarm Data Quality Workshop
  • 5th SDQW - 5th Swarm Data Quality Workshop
  • 6th SDQW - 6th Swarm Data Quality Workshop
  • 7th SDQW - 7th Swarm Data Quality Workshop
 


The Earth Observation Weekly Newsletter is sent by email every week - usually on Fridays - and contains information about the latest technical news, ERS and Envisat planning activities, special images, planned events, documentation and tools related to ESA and ESA supported Third Party Earth Observation missions.

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Latest EO Weekly Newsletter
17 November 2017 - Week 46/2017


SMOS nominal production resumed on 16 November 2017

17 November 2017

The SMOS nominal production resumed after the successful deployment of the new L2SM v650 processor.

The Level-0, NRT, and Level-1 production was restarted on 15 November. The Level-2 production was activated on 16 November at approximately 17:00 UTC. Observations with sensing time from 2017-11-15T00:00:00 onwards have been processed with the new L2SM 650 version.


SMOS nominal production delayed on 15 November 2017

15 November 2017

Due to the operational deployment of the new L2SM v650 processor, SMOS nominal production will be delayed on 15 November 2017. Production is expected to be fully reestablished on 16 November.

Further information will be provided as soon as the the upgrade is completed.


Two new Earth Explorer concepts to understand our rapidly changing world

15 November 2017

Web Content Image

ESA has chosen two concepts, FORUM and SKIM, to be developed further and compete to be the ninth Earth Explorer mission.

Thanks to new technical developments, the Far-infrared Outgoing Radiation Understanding and Monitoring (FORUM) candidate would measure radiation emitted from Earth across the entire far-infrared part of the electromagnetic spectrum. Significantly, it measures in the 15-100 micron range, which has never been done from space before.

These observations are important because Earth emits infrared radiation to space, which is affected by water vapour and cirrus clouds, which, in turn, play key roles in Earth's temperature.

FORUM's benchmark measurements would improve our understanding of the greenhouse effect and, importantly, contribute to the accuracy of climate change assessments that form the basis for policy decisions.

The Sea-surface Kinematics Multiscale monitoring (SKIM) candidate would carry a novel wide-swath scanning multibeam radar altimeter to measure ocean-surface currents. Uniquely, it uses a Doppler technique, which offers more direct measurements than conventional satellite altimeters.

These new measurements would improve our understanding of vertical and horizontal ocean–surface dynamics over the global ocean every few days. This would lead to better knowledge of how the ocean and atmosphere interact - for example, how atmospheric carbon dioxide is drawn down into the ocean.

SKIM would have particular relevance for understanding the rapidly changing Arctic Ocean, and for observing equatorial regions where conventional satellite altimeters are unable to provide useful measurements of currents.

Read more

RUS offers free Webinars for training in Sentinel data exploitation

17 November 2017

The ESA/EC RUS (Research and User Support for the Sentinel Core Products) service aims at fostering the handling of Sentinel data and offers training activities, tailored for users at any level of proficiency. Monthly webinars are regularly designed and organised to introduce the basics for downloading, visualizing, analyzing and processing Sentinel data using Open Source Toolboxes.

The next webinar will illustrate the use of Sentinel-2 for burned area mapping. It will be held on Tuesday, 05 December 2017, at 15:00 CET.

To register to this free webinar, please visit the training website.

To re-play previous webinars (Ship Detection and Flood Mapping), or to subscribe to the RUS training newsletter for information on forthcoming webinars and events visit the RUS training website.

Follow RUS Copernicus on Twitter or visit the RUS-Copernicus website for further information.


Web Content Image

2nd Mapping Water Bodies (MWBS 2018)

27 - 28 March 2018

The European Space Agency is organising the 2nd Mapping Water Bodies from Space Conference. This conference will be held at ESA-ESRIN in Frascati, Italy, on 27 and 28 March 2018.

The purpose of this conference is to provide scientists and data users with the opportunity to present first-hand and up-to-date results from their on-going research and application development activities by using data from past and current satellites.

The conference is open to ESA Principal Investigators and Co-investigators, Sentinel users, Scientists, Students, Representatives from national, European and international space agencies, research labs and value adding industries.


Abstract submission deadline: 10 January 2018


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LPVE2018 - Workshop on Land Product Validation and Evolution

27 February - 01 March 2018

Following the successful LPVE 2014, the European Space Agency (ESA) is inviting scientists and Cal/Val experts to present the latest results from their on-going research, including the evolution of products, the latest development in validation, the inter-comparison methodologies and the evolution of algorithms, at the 2018 Workshop on Land Product Validation and Evolution (LPVE 2018).

The workshop will be held at ESA/ESRIN, Frascati, Italy, from 27 February to 01 March 2018; it intends to address the following objectives:

  • Provide an overview on current land product Cal/Val approaches and protocols and their evolution
  • Revisit existing calibration and validation protocols and standards in the light of newly available satellite data, including Sentinel-2 and Sentinel-3
  • Present land product inter-comparison methodologies (in situ, satellite-satellite)
  • Discuss data harmonisation approaches across sensors
  • Identify key recommendations for ESA land product algorithm evolution
  • Formulate recommendations for future land products and future Cal/Val activities
  • Encourage close collaboration between Cal/Val and research groups

Extended abstract submission deadline: 30 November 2017


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Proba-V Symposium 2018

29 - 31 May 2018

The European Space Agency (ESA) in cooperation with the Belgian Science Policy Office (BELSPO) have organised the second Proba-V Symposium, which will take place in Ostend, Belgium, from 29 to 31 May 2018.

The symposium will promote the scientific and operational exploitation of Proba-V data and is open to Proba-V users, scientists, students, representatives from national, European and international agencies, operational end-users and value adding industries.


Registration opens: February 2018


This page provides a structured access to all available information related to the SMOS mission data products.

The links in the following tables provides a quick access to the main resources.

Access to SMOS data SMOS data availability SMOS data reader software
To access SMOS data see here For SMOS data availability see here For SMOS data reader software see here
The SMOS Data Products information brochure in PDF is available here
The access to the SMOS data portal is available here
SMOS data products quality information is available here

The following SMOS data products description provides detailed information and links to exhaustive documentation: read-me-first notes, Algorithm Theoretical Baseline Documents, Product Specification Documents and Data Quality Reports. The definition of the data products is based on the the CEOS (Committee on Earth Observation Satellites) conventions.

 

Raw data

These are SMOS Payload data in their original format (CCSDS packets) comprised of instrument observation data and housekeeping telemetry, as received from the satellite.

 

Level 0 data products

These are SMOS payload data in so-called Source Packets with added Earth Explorer product headers. They are chronologically sorted by Source Packet type: Observation Data and Housekeeping Telemetry. Detailed description of the SMOS L0 data format is available in the Level 0 data product specifications document (PDF).

 

Level 1 data products

The level 1 data products are for scientific users and are generated by the L1OP Processor integrated in the Data Processing Ground Segment. They are available in Earth Explorer format.

For an optimal exploitation of the current SMOS L1 data set V620 consult the read-me-first note available here.

Level 1A data products Level 1B data products Level 1C data products
Reformatted and calibrated observation and housekeeping data in engineering units. Scientific SMOS Level 1A products are the so-called calibrated visibilities between the individual antenna receivers prior to applying image reconstruction, and in full polarisation. Output of the image reconstruction of the SMOS observation measurements and consist of Fourier components of brightness temperatures in the antenna polarisation reference frame. Multi-incidence angle brightness temperatures at the top of the atmosphere, geolocated in an equal-area grid system (15Km, ISEA 4H9 grid). Separate dataset are available for sea and land pixels. Information is available per pixel and per snapshot. For each Level 1C product there is also a browse product containing the brightness temperatures averaged for an incidence angle of 42.5°.
For further information about the level 1 processing algorithms see the Data Processing Model documents:
SMOS L1A Data Processing Model Document (PDF) SMOS L1B Data Processing Model Document (PDF) SMOS L1C Data Processing Model Document (PDF)
Detailed descriptions of the SMOS L1 data format is available in the Level 1 and Auxilliary Data Product Specification Document (PDF)
For Level 1 product quality status see the SMOS data products quality page
SMOS L1OP Processor maintainer's website

Previous level 1 data products V505 read-me-first note is available here

 

Level 1 Near Real Time data products

The level 1 Near Real Time (NRT) data products are similar to the L1C product but adjusted to requirements of operational meteorological agencies. The NRT products are generated by the NRT Processor integrated in the Data Processing Ground Segment in BUFR format. NRT data is avaialble from ESA, NRT light is avaialble from EUMETCast Europe and WMO GTS within three hours from sensing time.

For an optimal exploitation of the current SMOS L1 data set V620 consult the read-me-first note available here.

NRT product NRT light product
Multi-incidence angle brightness temperatures at the top of the atmosphere, geolocated in an equal-area grid system (15Km, ISEA 4H9 grid) with reduced spatial resolution over the Ocean (30Km ISEA 4H8 grid). Multi-incidence angle brightness temperatures at the top of the atmosphere, geolocated on a N256 gaussian grid with a spatial resolution in the range of 30 - 50 Km. The product consist of Land pixel only.
Detailed description of the SMOS L1 NRT data format is available in the product specifcations documents: NRT Product Format Specifications Document (PDF) and NRT BUFR Speciifcation (PDF)

 

Level 2 data products

The level 2 data products are for scientific users and are generated by the L2OP Processors integrated in the Data Processing Ground Segment. They are available in Earth Explorer format and netCDF format.

For an optimal exploitation of the current SMOS L2 data set V6 consult the read-me-first notes available for V650 soil moisture data and V662 sea surface salinity data.

Level 2 soil moisture data product Level 2 sea surface salinity data product
The product contains the retrieved swath-based soil moisture, vegetation optical depth and other ancillary data derived during the processing (surface temperature, roughness parameter, dielectric constant, brightness temperature at the top of the atmosphere and at the surface) with their corresponding uncertainties. The product contains one single swath based Sea Surface Salinity (SSS) retrieved with and without Land-Sea contamination correction, SSS anomaly based on WOA-2009 referred to Land-Sea corrected SSS, brightness temperature at the top of the atmosphere and at the sea surface with their corresponding uncertainties.
For further information about the level 2 processing algorithms see the Algorithm Theoretical Basis documents:
SMOS L2 SM Algorithm Theoretical Basis Document (ATBD) SMOS L2 OS Algorithm Theoretical Basis Document (ATBD)
SMOS L2 Soil Moisture Processor maintainer's website SMOS L2 Sea Surface Salinity Processor maintainer's website
Detailed descriptions of the SMOS L2 data format is available in the Level 2 and Auxilliary Data Product Specification Document (PDF)
For Level 2 product quality status see the SMOS data products quality page

Previous level 2 SM data products V620 read-me-first note is available here

Previous level 2 SM data products V551 read-me-first note is available here

Previous level 2 OS data products V622 read-me-first note is available here

Previous level 2 OS data products V550 read-me-first note is available here

 

Level 2 Soil Moisture Near Real Time Neural Network data

The Soil Moisture Near Real Time Neural Network product (SM-NRT-NN) provides fast access (within four hours from sensing time) of soil moisture measurements. The soil moisture is retrieved from the multi-angular brightness temperature as available inside the SMOS level 1 Near Real Time BUFR product. The retrieval is based on a neural network schema trained using the level 2 soil moisture data set generated by the operational L2 soil moisture processor V620. The SM-NRT-NN product is avaialble from EUMETCast Europe, WMO GTS and SMOS data portal in netCDF format.

For an optimal exploitation of the current SM-NRT-NN product V100 consult the read-me-first note available here.

Soil Moisture NRT Neural Network product
The product contains the retrieved swath-based soil moisture and its uncertainty on the SMOS ISEA 4H9 grid for a slightly reduced swath width of about 915 Km.
Detailed description of the SMOS L2 SM-NRT-NN data format is available in the read-me-first note available here.

 

Level 3 and 4 data products

ESA's mandate for the provision of data products ends at level 2. For Sea Surface Salinity and Soil Moisture level 3 and 4 data products see the national French and Spanish processing entities: Centre Aval de Traitement des Données SMOS (CATDS) and SMOS CP34.

For Sea Ice thickness level 3 data products see the Integrated Climate Data Center (ICDC)

 

Auxiliary data


Level 1 auxiliary data

This type of data comprises the Discrete Global Grid (DGG), the land-sea mask, flat target transformation measurements, known RFI (Radio Frequency Interference) sources, etc. More information/downloads: http://www.smos.com.pt/project_data_adf.html

Level 2 soil moisture auxiliary data

These static or dynamically updated auxiliary files contain information needed for generating soil moisture products, such as ECOCLIMAP surface cover information, ECMWF forecast geophysical fields, vegetation optical thickness, etc. More information/downloads: http://smos.array.ca:8080/web/smos/adfs

Level 2 ocean salinity auxiliary data

These datasets are used for generating ocean salinity products. Examples include ocean target transformation lookup tables, roughness information, long-term salinity climatologies, etc. More information/downloads: https://smos.argans.co.uk/


Version 3.10