BackForwardInstrument:  WVC-2 

Instrument details
Acronym WVC-2
Full name Wide View CCD camera - 2
Purpose High-resolution land observation
Short description 4-channel camera in VIS/NIR. Two parallel cameras [see detailed characteristics below]
Background Improved after WVC flown on HJ-1 A/B.
Scanning Technique Pushbroom. Swath 360 km each camera, 720 km total
Resolution 16 m at s.s.p.
Coverage / Cycle Global coverage in 4 days
Mass Power Data Rate

 

Providing Agency CAST
Instrument Maturity Flown on operational programme
Utilization Period: 2020 to 2025
Last update: 2021-06-16
Detailed characteristics
Central wavelength Spectral interval SNR @ specified albedo
0.47 µm 0.43 - 0.52 µm ……  @  ….. % albedo
0.56 µm 0.52 - 0.60 µm ……  @  ….. % albedo
0.66 µm 0.63 - 0.69 µm ……  @  ….. % albedo
0.83 µm 0.76 - 0.90 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
  • High resolution optical imager
WIGOS Subcomponents
  • Subcomponent 1
  • High-resolution multi-spectral VIS/IR imagers
  • High-resolution multi-spectral VIS/IR imager
Mission objectives
Primary mission objectives
  • Biomass
  • Fraction of Absorbed PAR (FAPAR)
  • Fraction of vegetated land
  • Land cover
  • Leaf Area Index (LAI)
  • Normalised Difference Vegetation Index (NDVI)
  • Vegetation type
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*5 - marginalCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS and NIR channels. Biomass inferred from NDVI
Cloud cover5 - marginalInfrequent coverage.. Daylight only.VIS and NIR channels
Cloud optical depth4 - fairLow-density cloud only.. Infrequent coverage.. Daylight only.VIS and NIR channels
Earth surface albedo5 - marginalCloud sensitive.. Infrequent coverage.VIS channels
Fire fractional cover2 - very highDaylight only.. Cloud sensitive.VIS channels with high resolution for boundary detection
Fraction of Absorbed PAR (FAPAR)*4 - fairCloud sensitive.. Infrequent coverage.VIS channels including Red at 700 nm
Fraction of vegetated land*2 - very highCloud sensitive.. Daylight only.VIS and NIR channels
Glacier cover4 - fairCloud sensitive.. Long time for mapping.. Daylight only.VIS and NIR channels
Glacier topography5 - marginalCloud sensitive.. Long time for mapping.. Daylight only.VIS channel(s) and cross-track steering capability for stereoscopy between images from neighbour orbits
Ice sheet topography5 - marginalCloud sensitive.. Long time for mapping.. Daylight only.VIS channel(s) and cross-track steering capability for stereoscopy between images from neighbour orbits
Land cover*2 - very highCloud sensitive.. Daylight only.VIS and NIR channels
Land surface topography5 - marginalCloud sensitive.. Long time for mapping.. Daylight only.VIS channel(s) and cross-track steering capability for stereoscopy between images from neighbouring orbits
Leaf Area Index (LAI)*4 - fairCloud sensitive.. Daylight only.. Infrequent coverage.VIS and NIR channels. LAI inferred from NDVI
Normalised Difference Vegetation Index (NDVI)*2 - very highCloud sensitive.. Infrequent coverage.VIS and NIR channels
Photosynthetically Active Radiation (PAR)4 - fairCloud sensitive.. Infrequent coverage.VIS channels, range undersampled
Short-wave cloud reflectance5 - marginalInfrequent coverage.VIS and NIR channels. Unsuitable dynamic range (saturation)
Snow cover4 - fairCloud sensitive.. Infrequent coverage.. Daylight only.VIS and NIR channels
Soil moisture at surface5 - marginalCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS and NIR channels. Soil moisture inferred from differential brightness
Soil type2 - very highCloud sensitive.. Daylight only.VIS and NIR channels
Upward short-wave irradiance at TOA5 - marginalSpectral interpolation needed.. Information on BRDF needed.. Infrequent coverage.VIS and NIR channels
Vegetation type*3 - highCloud sensitive.. Daylight only.VIS and NIR channels
Aerosol volcanic ash5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.VIS and NIR channels
Aerosol volcanic ash Total Column5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.VIS and NIR channels
Sea-ice cover5 - marginalCloud sensitive.. Daylight only.VIS and NIR (for contour enhancement) channels