First global map of soil moisture and ocean salinity

SMOS data overview

The following SMOS Mission Data Products definitions are based on the CEOS (Committee on Earth Observation Satellites) conventions and have been specifically tailored to the SMOS mission.

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.

These are SMOS Payload data in Source Packets with added Earth Explorer product headers. They are chronologically sorted by Source Packet type: Observation Data and Housekeeping Telemetry.

These are the SMOS reformatted and calibrated Observation and Housekeeping data in engineering units. Level-1a products are physically consolidated in pole-to-pole time-based segments. Scientific SMOS level-1a products are the 'Calibrated Visibilities'.

The SMOS level 1b products are the output of the image reconstruction of the SMOS observation measurements and consist of Fourier Components of Brightness Temperatures in the antenna polarisation reference frame.

Since level-1b products are arranged as snapshots and not geographically sorted, SMOS level-1c products constitute reprocessed level-1b, which are geographically sorted, that is swath-based maps of Brightness Temperature.

Level-2 products are of two separate types:

  • Soil Moisture swath-based maps
  • Ocean Salinity swath-based maps

Global maps using level-3 data are produced in the next processing step.

Last update: 2 November 2010

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