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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
5.76 km for IR channels; 1.44 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 1998-04-08
Last update:
2019-05-30
Detailed characteristics
Spectral interval
SNR or NEΔT @ specified input
0.55 - 1.05 µm
43 @ 95 % albedo
6.30 - 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
WIGOS Subcomponents
No WIGOS subcomponents have been defined.
Mission objectives
Primary mission objectives Cloud cover Cloud top height Cloud top temperature Cloud type Integrated Water Vapour (IWV)
Secondary mission objectives Aerosol volcanic ash Total Column Precipitation intensity at surface (liquid or solid) Sea surface temperature Opportunity objectives Accumulated precipitation (over 24 h) Fire fractional cover Fire radiative power Fire temperature Snow cover Soil moisture at surface Show all Show fewer
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
Variable Relevance for measuring this variable Operational limitations Explanation
Cloud cover 4 - fair No specific limitation. VIS and TIR channels
Cloud top height 3 - high No specific limitation. TIR channels in window and water vapour band (for emissivity) to estimate cloud top height from its temperature
Cloud top temperature 3 - high No specific limitation. TIR channels in window and water vapour band (for emissivity)
Cloud type 4 - fair Daylight only. VIS and TIR channels
Fire fractional cover 4 - fair Cloud sensitive.. Coarse spatial resolution. VIS and TIR channels
Fire radiative power 5 - marginal Cloud sensitive.. Coarse spatial resolution. TIR channels. Frequent sampling (GEO) enables early detection
Fire temperature 5 - marginal Cloud sensitive.. Coarse spatial resolution. TIR channels. Frequent sampling (GEO) enables early detection
Precipitation intensity at surface (liquid or solid) 3 - high Convective precipitation dominant.. Calibration by MW needed. TIR channel(s) in the 11 micrometers window. Frequent sampling (GEO) consistent with precipitation temporal variability
Sea surface temperature 5 - marginal Cloud sensitive. TIR window channel(s) around 11 micrometers .
Snow cover 5 - marginal Cloud sensitive.. Daylight only. VIS channel(s). Frequent sampling (GEO) improves probability of cloud-free views
Soil moisture at surface 4 - fair Cloud sensitive.. Index only. VIS and TIR window channels. Soil moisture inferred from thermal inertia, that is accurately measured by frequent sampling (GEO)
Integrated Water Vapour (IWV) 4 - fair Cloud sensitive.. Middle troposphere dominant. TIR channels in the water vapour band around 6.3 micrometers
Aerosol volcanic ash Total Column 1 - primary Cloud sensitive. TIR channel(s). Frequent sampling (GEO) enables early detection of ash plumes
Wind (horizontal) 3 - high Cloud 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
Accumulated precipitation (over 24 h) 4 - fair Convective precipitation dominant.. Calibration by MW needed. TIR channel(s) in the 10-13 micrometers range. Frequent sampling (GEO) is essential for accumulated precipitation.
Instrument: S-VISSR (FY-2A/B)