BackForwardInstrument:  CLIM 

Instrument details
Acronym CLIM
Full name Cloud Imager
Purpose To provide cloud information in support of the CO2M instruments
Short description 3-channel VIS/NIR/SWIR radiometer [see details below]
Background Operating in association with a Multi-Angle Polarimeter (MAP) in support of the Combined Carbon Dioxide and Nitrogen Dioxide Imager.
Scanning Technique Pushbroom scanning, swath 465 km.
Resolution 174 m (VIS and NIR) and 348 m (SWIR) at s.s.p.
Coverage / Cycle
Mass Power Data Rate

 

Providing Agency ESA
Instrument Maturity Flown on an R&D satellite
Utilization Period: TBD
Last update: 2021-10-11
Detailed characteristics

Channel

Wavelenght

Bandwidth

SNR @ specified input radiance

IFOV at s.s.p.

CLIM-1

670 nm

20 nm

… @ … W m-2 sr-1 µ-1

174 m

CLIM-2

753 nm

9 nm

… @ … W m-2 sr-1 µ-1

174 m

CLIM-3

1370 nm

15 nm

… @ … W m-2 sr-1 µ-1

348 m

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 optical depth
  • Cloud top height
  • Cloud type
Secondary mission objectives
  • Aerosol volcanic ash Total Column
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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
Biomass4 - 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 top height5 - marginalDaylight only.NIR channels to estimate the total-column O2 above the cloud top as measured around 760 nm
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
Sea-ice cover4 - fairCloud sensitive.. Daylight only.VIS, NIR (for contour enhancement) and SWIR (for discrimination from clouds) channels
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