BackForwardInstrument:  SMAP 

Instrument details
Acronym SMAP
Full name Soil Moisture Active-Passive (intended as payload)
Purpose Soil moisture in the roots region
Short description MW radiometer, frequency 1.41 GHz, co-aligned with SAR at 1.26 GHz - Full polarisation for the radiometer, VV, HH and HV for the SAR. Single antenna of 6 m diameter
Background New development, re-designed after the previous "Hydros" project.
Scanning Technique Conical scanning, 14.6 rpm, or 30 km/scan; incidence angle 40°, swath 1000 km
Resolution Radiometer: 40 km; SAR: 30 km (unprocessed, real aperture), 3 km (processed)
Coverage / Cycle Global coverage in 1.5 days
Mass 356 kg Power 448 W Data Rate 40 Mbps

 

Providing Agency NASA
Instrument Maturity Demonstration pending
Utilization Period: 2015-05-19 to ≥2020
Last update: 2014-09-18
Detailed characteristics
Satellites this instrument is flying on

Note: a red tag indicates satellites no longer operational, a green tag indicates operational satellites, a blue tag indicates future satellites

Instrument classification
  • Earth observation instrument
  • Passive microwave radiometer
  • Conical scanning microwave radiometer
Mission objectives
Primary mission objectives
  • Sea surface salinity
  • Soil moisture (in the roots region)
  • Soil moisture at surface
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Tentative Evaluation of Measurements

The following list indicates which measurements can typically be retrieved from this category of instrument. To see a full Gap Analysis by Variable, click on the respective variable.

Note: table can be sorted by clicking on the column headers
VariableRelevance for measuring this variableOperational limitationsExplanation
Sea surface salinity1 - primaryNo specific limitation.MW polarimetric L-band radiometer (1.4 GHz) associated to a co-aligned L-band SAR (1.26 GHz) for roughness correction
Soil moisture (in the roots region)1 - primaryCoarse spatial resolution.MW channels around 1.4 GHz
Soil moisture at surface1 - primaryCoarse spatial resolution.MW channels around 1.4 GHz