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  • Campaign

    Campaign

    CoSMOS 2006

    Coastal Current front

  • News - Data Release news

    News - Data Release news

    SMOS sea ice thickness reprocessed data now available

    The reprocessed SMOS level 3 and 4 sea ice thickness products over the Arctic are now available from the ESA SMOS Dissemination Service.

  • News - Success Stories

    News - Success Stories

    Satellite data predicts lower wheat crop yield

    Maria José Escorihuela, Principal Investigator for the ACCWA project at isardSAT, says: “Current drought observation warning sys...

  • News - Events and Proceedings

    News - Events and Proceedings

    Special event for 10th anniversary of SMOS

    Synergies with current and future EO missions The symposium is open to scientists and engineers interested in exploring the capabilities...

  • Event - Workshop

    Event - Workshop

    IDEAS+ Cal/Val Workshop 7

    Regular workshops are held every nine months with the whole IDEAS+ Task 3-Cal/Val team in order to review the status of current activit...

  • News - Success Stories

    News - Success Stories

    SMOS data improve estimates of rainfall in Africa

    Scientists have used soil moisture data from ESA’s SMOS mission to correct high-resolution satellite-based estimates of precipitation in Africa.

  • News - Success Stories

    News - Success Stories

    Transforming space data into climate action

    By combining high-quality data from both current and previous missions, scientists are improving their understanding of the long-term c...

  • Event - Workshop

    Event - Workshop

    Understanding the Carbon and Water Cycles using SMOS Data and Models

    To review the current advances on SMOS observations, products and capacity to improve the characterisation of the land surface processes...

  • Event - Training

    Event - Training

    EO Summer School 4

    Keynote lectures on global change issues are also given to discuss the current state of the science of global change and its relationsh...

  • Event - Meeting

    Event - Meeting

    VH-RODA and CEOS SAR workshop

    The workshop, hosted by ESA/ESRIN, provided an open forum for the presentation and discussion of current status and future developments...

  • Event - Training

    Event - Training

    EO Summer School 5

    Keynote lectures on global change issues are also given to discuss the current state of the science of global change and its relationsh...

  • Event - Training

    Event - Training

    Advanced Training Course in Land Remote Sensing 2012

    Objectives The objectives of this advanced Dragon training course were: To inform on past, current and future EO satellite missions and...

  • Instrument - Interferometric Radiometers

    Instrument - Interferometric Radiometers

    MIRAS

    The MIRAS instrument is a passive microwave 2-D interferometric radiometer onboard the SMOS satellite.

  • Mission - Earth Explorers

    Mission - Earth Explorers

    SMOS

    The Soil Moisture and Ocean Salinity (SMOS) mission is dedicated to making global observations of soil moisture over land and salinity over oceans.

  • Instrument - Interferometric Radiometers

    Instrument - Interferometric Radiometers

    SMOS product availability

    Short Current Year 2022 Previous Years

  • Mission - Heritage Missions, Third Party Missions

    Mission - Heritage Missions, Third Party Missions

    Landsat Series

    The Landsat Series is the world's longest running system of satellites for moderate-resolution optical remote sensing for land, coastal areas and shallow waters.

  • Activity - Quality

    Activity - Quality

    EDAP

    The ESA Earthnet Data Assessment Pilot (EDAP) project will perform assessments for various missions to ensure the delivered data is fit for purpose.

  • Data - Data Description

    Data - Data Description

    SMOS L1 and L2 Science data

    SMOS Level 1 data products are designed for scientific and operational users who need to work with calibrated MIRAS instrument measurements, while SMOS Level 2 data products are designed for scientific and operational users who need to work with geo-located soil moisture and sea surface salinity estimation as retrieved from the L1 dataset. Products from the SMOS Data Processing Ground Segment (DPGS) located at the European Space Astronomy Centre (ESAC), belonging to the latest processing baseline, have File Class OPER. Reprocessed SMOS data is tagged as REPR. The Level 1A product comprises all calibrated visibilities between receivers (i.e. the interferometric measurements from the sensor including the redundant visibilities), combined per integration time of 1.2s (snapshot). The snapshots are consolidated in a pole-to-pole product file (50 minutes of sensing time) with a maximum size of about 215MB per half orbit (29 half orbits per day). Access to this products is restricted to SMOS Cal/Val users. The Level 1B product comprises the result of the image reconstruction algorithm applied to the L1A data. As a result, the reconstructed image at L1B is simply the difference between the sensed scene by the sensor and the artificial scene. The brightness temperature image is available in its Fourier component in the antenna polarisation reference frame top of the atmosphere. Images are combined per integration time of 1.2 seconds (snapshot). The removal of foreign sources (Galactic, Direct Sun, Moon) is also included in the reconstruction. Snapshot consolidation is as per L1A, with a maximum product size of about 115MB per half orbit. ESA provides the Artificial Scene Library (ASL) to add the artificial scene in L1B for any user that wants to start from L1B products and derive the sensed scene. The Level 1C product contains multi-angular brightness temperatures in antenna frame (X-pol, Y-pol, T3 and T4) at the top of the atmosphere, geo-located in an equal-area grid system (ISEA 4H9 - Icosahedral Snyder Equal Area projection). The pixels are consolidated in a pole-to-pole product file (50 minutes of sensing time), with a maximum size of about 350MB per half orbit (29 half orbits per day). Spatial resolution is in the range of 30-50 km. For each L1C product there is also a corresponding Browse product containing brightness temperatures interpolated for an incidence angle of 42.5°. Two L1C products are available: Land for soil moisture retrieval and Sea for sea surface salinity retrieval. The Level 2 Soil Moisture (SM) product comprises soil moisture measurements geo-located in an equal-area grid system ISEA 4H9. The product contains not only the retrieved soil moisture, but also a series of ancillary data derived from the processing (nadir optical thickness, surface temperature, roughness parameter, dielectric constant and brightness temperature retrieved at top of atmosphere and on the surface) with the corresponding uncertainties. The pixels are consolidated in a pole-to-pole product file (50 minutes of sensing time), with a maximum size of about 7MB (25MB uncompressed data) per half orbit (29 half orbits per day). This product is available in both Earth Explorer and NetCDF formats. The Level 2 Ocean Salinity (OS) product comprises sea surface salinity measurements geo-located in an equal-area grid system ISEA 4H9. The product contains one single swath-based sea surface salinity retrieved with and without Land-Sea contamination correction, SSS anomaly based on WOA-2009 referred to Land-Sea corrected sea surface salinity, brightness temperature at the top of the atmosphere and at the sea surface with their corresponding uncertainties. The pixels are consolidated in a pole-to-pole product file (50 minutes of sensing time), with a maximum size of about 10MB (25MB uncompressed data) per half orbit (29 half orbits per day). This product is available in both Earth Explorer and NetCDF formats. For an optimal exploitation of the SMOS L1 and L2 datasets, please refer to the Resources section below in order to access Product Specifications, read-me-first notes, etc.

  • Mission - Earth Explorers

    Mission - Earth Explorers

    SMOS Objectives

    SMOS Science The SMOS mission is a direct response to the current lack of global observations of soil moisture and ocean salinity which ...

  • Mission - Earth Explorers

    Mission - Earth Explorers

    SMOS Overview

    Mission Background The SMOS mission is a direct response to the current lack of global observations of soil moisture and ocean salinity,...