BackForwardInstrument:  SEVIRI 

Instrument details
Acronym SEVIRI
Full name Spinning Enhanced Visible Infra-Red Imager
Purpose Multi-purpose imagery and wind derivation by tracking clouds and water vapour features
Short description 12 channels (11 narrow-bandwidth, 1 high-resolution broad-bandwidth VIS) [see detailed characteristics below]
Background New development
Scanning Technique Mechanical, spinning satellite, E-W continuous, S-N stepping
Resolution 4.8 km IFOV, 3 km sampling for narrow channels; 1.6 km IFOV, 1 km sampling for broad VIS channel
Coverage / Cycle Full disk every 15 min.  Limited areas in correspondingly shorter time intervals
Mass 260 kg Power 150 W Data Rate 3.26 Mbps

 

Providing Agency EUMETSAT
Instrument Maturity Flown on operational programme
Utilization Period: 2004-01-09 to ≥2022
Last update: 2016-10-24
Detailed characteristics
Central wavelength Spectral interval (99 % encircled energy) SNR or NEΔT @ specified input
N/A (broad bandwidth channel) 0.6 - 0.9 µm 4.3 @ 1 % albedo
0.635 µm 0.56 - 0.71 µm 10.1 @ 1 % albedo
0.81 µm 0.74 - 0.88 µm 7.28 @ 1 % albedo
1.64 µm 1.50 - 1.78 µm 3 @ 1 % albedo
3.92 µm 3.48 - 4.36 µm 0.35 K @ 300 K
6.25 µm 5.35 - 7.15 µm 0.75 K @ 250 K
7.35 µm 6.85 - 7.85 µm 0.75 K @ 250 K
8.70 µm 8.30 - 9.10 µm 0.28 K @ 300 K
9.66 µm 9.38 - 9.94 µm 1.50 K @ 255 K
10.8 µm 9.80 - 11.8 µm 0.25 K @ 300 K
12.0 µm 11.0 - 13.0 µm 0.37 K @ 300 K
13.4 µm 12.4 - 14.4 µm 1.80 K @ 270 K
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 optical depth
  • Cloud top height
  • Cloud top temperature
  • Cloud type
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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
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
Biomass4 - fairCloud sensitive. Index only. Daylight only. VIS, NIR and SWIR channels. Biomass inferred from NDVI and LAI
Cloud cover1 - primaryNo specific limitation. VIS, NIR, SWIR, MWIR and TIR channels
Cloud drop effective radius4 - fairAt cloud top. Daylight only. VIS, NIR, SWIR and MWIR channels (for differentiation)
Cloud ice effective radius4 - fairAt cloud top. Daylight only. VIS, NIR, SWIR and MWIR channels (for differentiation)
Cloud optical depth4 - fairLow-density cloud only. Daylight only. VIS, NIR and SWIR channels
Cloud top height2 - very highNo specific limitation. TIR channels in window and water vapour band (for emissivity) for temperature; and in CO2 band for atmospheric column above cloud top
Cloud top temperature2 - very highNo specific limitation. TIR channels in window and water vapour band (for emissivity)
Cloud type1 - primaryNo specific limitation. VIS, NIR, SWIR, MWIR and TIR channels
Downward short-wave irradiance at Earth surface4 - fairCloud sensitive. Highly indirect. VIS, NIR and SWIR channels
Downward long-wave irradiance at Earth surface5 - marginalCloud sensitive. Highly indirect. MWIR and TIR channels including water vapour and CO2 bands
Earth surface albedo3 - highCloud sensitive. VIS channel with changing solar incidence angles as daylight progresses
Earth surface short-wave bidirectional reflectance4 - fairCloud sensitive. VIS, NIR and SWIR channels with changing solar incidence angles as daylight progresses
Fire fractional cover2 - very highCloud sensitive. Coarse spatial resolution. VIS, MWIR and TIR channels. Frequent sampling (GEO) enables early detection
Fire radiative power2 - very highCloud sensitive. Coarse spatial resolution. MWIR and TIR channels. Frequent sampling (GEO) enables early detection
Fire temperature2 - very highCloud sensitive. Coarse spatial resolution. MWIR and TIR channels. Frequent sampling (GEO) enables early detection
Land surface temperature4 - fairCloud sensitive. MWIR and TIR window channels (high sensitivity to high temperature, cloud impact reduction, water vapour correction)
Leaf Area Index (LAI)2 - very highCloud sensitive. Daylight only. VIS, NIR and SWIR channels
Normalised Difference Vegetation Index (NDVI)2 - very highCloud sensitive. Daylight only. VIS and NIR channels
O3 (Total column)4 - fairCloud sensitive. TIR channel(s). Ozone lines in band around 9.7 micrometers. Frequent sampling (GEO) enables monitoring diurnal variations
Photosynthetically Active Radiation (PAR)5 - marginalCloud sensitive. VIS channels, range undersampled
Precipitation intensity at surface (liquid or solid)4 - fairConvective precipitation dominant. Calibration by MW needed. TIR channels in the 11 micrometers window, and SWIR and the MWIR 3.7 window channel for cloud microphysics. Frequent sampling (GEO) consistent with precipitation temporal variability
Sea surface temperature2 - very highCloud sensitive. MWIR and TIR window channels around 3.7 and 11 micrometers (cloud impact reduction, water vapour correction)
Short-wave cloud reflectance4 - fairNo specific limitation. VIS, NIR and SWIR channels
Snow cover2 - very highCloud sensitive. Daylight only. VIS, NIR and SWIR channels enabling screening snow from clouds. Frequent sampling improves probability of cloud-free views
Soil moisture at surface3 - highCloud sensitive. Index only. VIS, NIR, SWIR, MWIR and TIR channels. Soil moisture inferred from differential brightness and thermal inertia, that are accurately measured by frequent sampling (GEO)
Specific humidity4 - fairCloud sensitive. Coarse vertical resolution. Middle troposphere only. TIR channels in the water vapour band around 6.3 micrometers
Integrated Water Vapour (IWV)2 - very highCloud sensitive. TIR channels around 6.3 micrometers and in the 11 micrometers split window
Upward short-wave irradiance at TOA3 - highSpectral interpolation needed. VIS, NIR and SWIR channels with changing solar incidence angles as daylight progresses
Upward long-wave irradiance at TOA4 - fairSpectral interpolation needed. MWIR and TIR channels in windows around 3.7 and 11 micrometers, and in water vapour and CO2 bands around 6.3 and 15 micrometers
Upward long-wave irradiance at Earth surface5 - marginalCloud sensitive. Highly indirect. MWIR and TIR channels in windows around 3.7 and 11 micrometers, and in the water vapour band around 6.3 micrometers
Aerosol volcanic ash5 - marginalCloud sensitive. Daylight only. VIS, NIR and SWIR channels
Aerosol volcanic ash (Total column)2 - very highCloud sensitive. TIR channel(s). Frequent sampling (GEO) enables early detection of ash plumes
Wind (horizontal)2 - very highCloud or water vapour tracers needed. VIS channel(s) and TIR channels around 6.3 and 11 micrometers, and 13.3 micrometers for more accurate height assignment. Frequent sampling (GEO) enables inference from cloud or water vapour pathces motion