Minimize Dataset Details
Earth Topics (Applications)
  • Land
  • soil

  • Ocean and Coast
  • Sea Surface Salinity

    Instrument
    Mission
    Operators:
    ESA
    Date of Launch:
    2 November 2009
    Mission Status:
    Operating nominally
    Orbit Height:
    758 km
    Orbit type:
    Sun-synchronous, dawn/dusk, circular orbit
    Swath Width:
    900 km
    SMOS Science Products
    SMOS
    (1662) recent views
    Last update: 23 August 2018

    Level 1 SMOS data products are designed for scientific and operational users who need to work with calibrated MIRAS instrument measurements, while Level 2 SMOS 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 Level 1 dataset.

    SMOS Level 1

    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).

    The Level 1B product comprises the result of the image reconstruction algorithm applied to the L1A data. 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 1.2s (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.

    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). Two L1C products are available: Land for soil moisture retrieval and Sea for sea surface salinity retrieval. 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°.

    • Temporal coverage: 12-01-2010 - current day
    • Current Processor Version: v6.2.0

    SMOS Level 2

    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). Spatial resolution is in the range of 30-50 km.

    • Temporal coverage: 01-06-2010 - current day
    • Current Processor Version: v6.5.0

    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). Spatial resolution is in the range of 30-50 km.

    • Temporal coverage: 01-06-2010 - current day
    • Current Processor Version: v6.6.2

    Level 1 and Level 2 products are coming from the operational pipeline in the SMOS Data Processing Ground Segment (DPGS) located at the European Space Astronomy Centre (ESAC).

    Operational products have File Class "OPER". Reprocessed data is tagged as "REPR".

    The following Science data products belonging to the latest processing baseline are openly available to all users:

    • MIR_SC_F1B/MIR_SC_D1B: Level 1B product, FULL/DUAL polarisation mode, in Earth Explorer format
    • MIR_SCLF1C/MIR_SCLD1C: Level 1C product over Land, FULL/DUAL polarisation mode, in Earth Explorer format
    • MIR_SCSF1C/MIR_SCSD1C: Level 1C product over Sea, FULL/DUAL polarisation mode, in Earth Explorer format
    • MIR_BWLF1C/MIR_BWLD1C: Level 1C Browse product over Land, FULL/DUAL polarisation mode, in Earth Explorer format
    • MIR_BWSF1C/MIR_BWSD1C: Level 1C Browse product over Sea, FULL/DUAL polarisation mode, in Earth Explorer format
    • MIR_SMUDP2: Level 2 Soil Moisture product, in Earth Explorer and NetCDF format
    • MIR_OSUDP2: Level 2 Sea Surface Salinity product, in Earth Explorer and NetCDF format

    The following Science data products belonging to the latest processing baseline are available to CalVal users only:

    • MIR_SC_F1A/MIR_SC_D1A: Level 1A product, FULL/DUAL polarisation mode, in Earth Explorer format
    • MIR_SMDAP2: Level 2 Soil Moisture analysis product, in Earth Explorer
    • MIR_OSDAP2: Level 2 Sea Surface Salinity analysis product, in Earth Explorer

    Detailed information on the SMOS products is available.

    Processing level
    Level 1
    Level 2
    How to access this data
    Resources

    PDF

    SMOS Level 1 and Auxiliary Data Products Specifications

    PDF

    SMOS Level 2 and Auxiliary Data Products Specifications