BackForwardInstrument:  Végétation  

Instrument details
Acronym Végétation
Full name Végétation
Purpose Vegetation observation
Short description 4-channel VIS/NIR/SWIR radiometer [see detailed characteristics below]
Background New development
Scanning Technique Pushbroom, 1728 pixel/line, swath 2200 km
Resolution 1.15 km at s.s.p.
Coverage / Cycle Near-global coverage in one day
Mass 152 kg Power 200 W Data Rate 510 kbps

 

Providing Agency CNES
Instrument Maturity Flown on operational programme
Utilization Period: 1998 to 2015
Last update: 2022-08-08
Detailed characteristics
Central wavelength Spectral interval SNR @ specified albedo
0.450 µm 0.43 - 0.47 µm …... @ ….. % albedo
0.645 µm 0.61 - 0.68 µm …... @ ….. % albedo
0.835 µm 0.78 - 0.89 µm …... @ ….. % albedo
1.645 µm 1.58 - 1.75 µm …... @ ….. % albedo
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
  • Subcomponent 1
  • VIS/IR imagery; realisation of a Day/Night band [in SSO]
  • VIS/IR imager [in SSO]
Mission objectives
Primary mission objectives
  • Biomass
  • Leaf Area Index (LAI)
  • Normalised Difference Vegetation Index (NDVI)
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
Note: * Primary mission objective.
VariableRelevance for measuring this variableOperational limitationsExplanation
Biomass*4 - fairCloud sensitive.. Index only.. Daylight only.VIS, NIR and SWIR channels. Biomass inferred from NDVI and LAI
Cloud cover5 - marginalDaylight only.VIS and NIR channels
Cloud optical depth3 - highLow-density cloud only.. Daylight only.VIS, NIR and SWIR channels
Cloud type5 - marginalDaylight only.VIS and NIR channels
Downward short-wave irradiance at Earth surface3 - highCloud sensitive.. Highly indirect.VIS, NIR and SWIR channels
Fire fractional cover5 - marginalCloud sensitive.. Coarse spatial resolution.. Daylight only.VIS channels
Leaf Area Index (LAI)*2 - very highCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Normalised Difference Vegetation Index (NDVI)*3 - highCloud sensitive.VIS and NIR channels
Photosynthetically Active Radiation (PAR)5 - marginalCloud sensitive.VIS channels, range undersampled
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
Soil moisture at surface5 - marginalCloud sensitive.. Index only.. Daylight only.VIS, NIR and SWIR channels. Soil moisture inferred from differential brightness
Upward short-wave irradiance at TOA5 - marginalSpectral interpolation needed.. Information on BRDF needed.VIS, NIR and SWIR channels
Aerosol volcanic ash5 - marginalCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Aerosol volcanic ash Total Column5 - marginalCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Sea-ice cover4 - fairCloud sensitive.. Daylight only.VIS, NIR (for contour enhancement) and SWIR (for discrimination from clouds) channels