BackForwardInstrument:  S-VISSR (FY-2A/B) 

Instrument details
Acronym S-VISSR (FY-2A/B)
Full name Stretched Visible and Infrared Spin Scan Radiometer
Purpose Multi-purpose imagery and wind derivation by tracking clouds and water vapour features
Short description 3 VIS/TIR channels [see detailed characteristics below]
Background Similar to the Meteosat MVIRI
Scanning Technique Mechanical, spinning satellite, E-W continuous, S-N stepping
Resolution 5.0 km for IR channels; 1.25 km for the VIS channel
Coverage / Cycle Full disk every 30 min.  Limited areas in correspondingly shorter time intervals
Mass 82 kg Power 75 W Data Rate 14 Mbps

 

Providing Agency CMA
Instrument Maturity Flown on operational programme
Utilization Period: 1997 to 2006-02-01
Last update: 2017-03-27
Detailed characteristics

Spectral interval

SNR or NEΔT @ specified input

0.55 - 1.05 µm

43 @ 95 % albedo

6.20 - 7.60 µm

1.0 K @ 300 K

10.5 - 12.5 µm

0.5 K@ 300K

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 optical radiometer or spectrometer
  • Moderate resolution optical imager
Mission objectives
Primary mission objectives
  • Cloud cover
  • Cloud top height
  • Cloud top temperature
  • Cloud type
  • Integrated Water Vapour (IWV)
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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 temperature5 - marginalCloud sensitive.TIR window channel(s) around 11 micrometers .
Wind (horizontal)3 - highCloud or water vapour tracers needed.VIS channel(s) and TIR channels around 6.3 and 11 micrometers. Frequent sampling (GEO) enables inference from cloud or water vapour pathces motion
Aerosol volcanic ash (Total column)1 - primaryCloud sensitive.TIR channel(s). Frequent sampling (GEO) enables early detection of ash plumes
Integrated Water Vapour (IWV)4 - fairCloud sensitive.. Middle troposphere dominant.TIR channels in the water vapour band around 6.3 micrometers
Cloud cover4 - fairNo specific limitation.VIS and TIR channels
Cloud top temperature3 - highNo specific limitation.TIR channels in window and water vapour band (for emissivity)
Cloud top height3 - highNo specific limitation.TIR channels in window and water vapour band (for emissivity) to estimate cloud top height from its temperature
Cloud type4 - fairDaylight only.VIS and TIR channels
Precipitation intensity at surface (liquid or solid)3 - highConvective precipitation dominant.. Calibration by MW needed.TIR channel(s) in the 11 micrometers window. Frequent sampling (GEO) consistent with precipitation temporal variability
Accumulated precipitation (over 24 h)3 - highConvective precipitation dominant.. Calibration by MW needed.TIR channel(s) in the 10-13 micrometers range. Frequent sampling (GEO) is essential for accumulated precipitation
Soil moisture at surface4 - fairCloud sensitive.. Index only.VIS and TIR window channels. Soil moisture inferred from thermal inertia, that is accurately measured by frequent sampling (GEO)
Fire fractional cover4 - fairCloud sensitive.. Coarse spatial resolution.VIS and TIR channels
Fire temperature5 - marginalCloud sensitive.. Coarse spatial resolution.TIR channels. Frequent sampling (GEO) enables early detection
Fire radiative power5 - marginalCloud sensitive.. Coarse spatial resolution.TIR channels. Frequent sampling (GEO) enables early detection
Snow cover5 - marginalCloud sensitive.. Daylight only.VIS channel(s). Frequent sampling (GEO) improves probability of cloud-free views