BackForwardInstrument:  CHIME 

Instrument details
Acronym CHIME
Full name Copernicus Hyperspectral Imaging Mission for the Environment
Purpose Agricultural services and sustainable agricultural management, and raw materials. Also, ocean colour
Short description VIS/NIR/SWIR spectrometer covering the range 400-2500 nm with a Spectral Sampling Interval <= 10 nm [for radiometric performance, see details below].
Background Follow-on of the Sentinel-2 Multi-Spectral Imager (MSI)
Scanning Technique Pushbroom, swath 290 km.
Resolution 20-30 m at s.s.p.
Coverage / Cycle Global coverage in 10 days, in daylight.
Mass Power Data Rate

 

Providing Agency ESA
Instrument Maturity Flown on an R&D satellite
Utilization Period: TBD
Last update: 2021-10-25
Detailed characteristics

Wavelength

NEΔL  (for land)

SNR @ reference L (for sea)

400-430 nm

0.40 W sr-1 m-2 µm-1

 

400 nm

 

2188 @ 62.95 W sr-1 m-2 µm-1

412.5 nm

 

2061 @ 74.14 W sr-1 m-2 µm-1

430-450 nm

0.40 W sr-1 m-2 µm-1

 

442.5 nm

 

1811 @ 65.61 W sr-1 m-2 µm-1

490 nm

 

1541 @ 51.21 W sr-1 m-2 µm-1

500-600 nm

0.28 W sr-1 m-2 µm-1

 

510 nm

 

1488 @ 44.39 W sr-1 m-2 µm-1

560 nm

 

1280 @ 31.49 W sr-1 m-2 µm-1

600-830 nm

0.21 W sr-1 m-2 µm-1

 

753.5 nm

 

605 @ 10.33 W sr-1 m-2 µm-1

778.75 nm

 

812 @ 9.18 W sr-1 m-2 µm-1

830-890 nm

0.19 W sr-1 m-2 µm-1

 

890-940 nm

0.17 W sr-1 m-2 µm-1

 

940-1130 nm

0.14 W sr-1 m-2 µm-1

 

1130-1280 nm

0.10 W sr-1 m-2 µm-1

 

1280-1330 nm

0.085 W sr-1 m-2 µm-1

 

1330-1480 nm

best effort

 

1480-1520 nm

0.05 W sr-1 m-2 µm-1

 

1520-1760 nm

0.065 W sr-1 m-2 µm-1

 

1760-1950 nm

best effort

 

1950-2050 nm

0.05 W sr-1 m-2 µm-1

 

2050-2450 nm

0.035 W sr-1 m-2 µm-1

 

2450-2500 nm

best effort

 

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
  • Hyperspectral imager (for vegetation)
Mission objectives
Primary mission objectives
  • Biomass
  • Fraction of Absorbed PAR (FAPAR)
  • Fraction of vegetated land
  • Land cover
  • Leaf Area Index (LAI)
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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
Aerosol column burden4 - fairCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR (including the 760 nm band for high-level aerosol) and SWIR hyperspectral channels
Aerosol effective radius4 - fairCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR including the 760 nm band for high-level aerosol, and SWIR hyperspectral channels
Aerosol mass mixing ratio4 - fairCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR (including the 760 nm band for high-level aerosol) and SWIR hyperspectral channels
Aerosol Optical Depth4 - fairCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR (including the 760 nm band for high-level aerosol) and SWIR hyperspectral channels
Aerosol type4 - fairCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR (including the 760 nm band for high-level aerosol) and SWIR hyperspectral channels
Biomass3 - highCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR hyperspectral channels. Biomass inferred from NDVI and other vegetation indexes
Cloud cover4 - fairInfrequent coverage.. Daylight only.VIS, NIR and SWIR hyperspectral channels
Cloud optical depth2 - very highLow-density cloud only.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR hyperspectral channels
Cloud top height4 - fairInfrequent coverage.. Daylight only.NIR hyperspectral channels to estimate the total-column O2 above the cloud top as measured around 760 nm
Colour Dissolved Organic Matter (CDOM)2 - very highDaylight only.. Cloud sensitive.Many VIS channels of bandwidth <= 10 nm
Downward short-wave irradiance at Earth surface2 - very highCloud sensitive.. Highly indirect.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR hyperspectral channels
Earth surface albedo4 - fairCloud sensitive.. Infrequent coverage.VIS hyperspectral channels
Cloud type5 - marginalInfrequent coverage.. Daylight only.. Cloud sensitive.VIS, NIR and SWIR hyperspectral channels
Fire fractional cover2 - very highDaylight only.. Cloud sensitive.VIS channels with high resolution for boundary detection
Fraction of Absorbed PAR (FAPAR)3 - highHigh troposphere only.. Cloud sensitive.. Infrequent coverage.VIS channels including Red at 700 nm
Fraction of vegetated land1 - primaryCloud sensitive.. Daylight only.VIS, NIR and SWIR hyperspectral
Glacier cover3 - highCloud sensitive.. Long time for mapping.. Daylight only.VIS, NIR and SWIR channels, screening ice from clouds
Land cover1 - primaryCloud sensitive.. Daylight only.VIS, NIR and SWIR hyperspectral channels
Leaf Area Index (LAI)1 - primaryCloud sensitive.. Daylight only.. Infrequent coverage.VIS, NIR and SWIR hyperspectral channels
Normalised Difference Vegetation Index (NDVI)1 - primaryCloud sensitive.. Infrequent coverage.VIS and NIR hyperspectral channels
Ocean chlorophyll concentration 2 - very highDaylight only.. Cloud sensitive.Many VIS channels of bandwidth <= 10 nm
Ocean Diffuse Attenuation Coefficient (DAC)2 - very highDaylight only.. Cloud sensitive.Many VIS channels of bandwidth <= 10 nm
Ocean suspended sediments concentration2 - very highDaylight only.. Cloud sensitive.Many VIS channels of bandwidth <= 10 nm
Oil spill cover4 - fairCloud sensitive.. Daylight only.. Infrequent coverage.VIS hyperspectral channels
Photosynthetically Active Radiation (PAR)3 - highCloud sensitive.. Infrequent coverage.VIS channels, range accurately sampled
Sea-ice cover4 - fairCloud sensitive.. Daylight only.VIS, NIR (for contour enhancement) and SWIR (for discrimination from clouds) channels
Short-wave cloud reflectance4 - fairInfrequent coverage.VIS, NIR and SWIR channels. Unsuitable dynamic range (saturation)
Snow cover1 - primaryCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels, enabling screening snow from clouds
Soil moisture at surface5 - marginalCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR hyperspectral channels. Soil moisture inferred from differential brightness
Soil type1 - primaryCloud sensitive.. Daylight only.VIS, NIR and SWIR hyperspectral channels
Specific humidity4 - fairCloud sensitive.. Very coarse vertical resolution.. Infrequent coverage.. Daylight only.NIR hyperspectral channels including the ro-sigma-tau band of water vapour around 940 nm
Integrated Water Vapour (IWV)5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.NIR hyperspectral channels covering the 940 nm band
Upward short-wave irradiance at TOA5 - marginalSpectral interpolation needed.. Information on BRDF needed.. Infrequent coverage.VIS, NIR and SWIR hyperspectral channels
Vegetation type1 - primaryCloud sensitive.. Daylight only.VIS, NIR and SWIR hyperspectral channels
Aerosol volcanic ash4 - fairCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR hyperspectral channels including the 760 nm band for high-level ash
Aerosol volcanic ash Total Column4 - fairCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR hyperspectral channels including the 760 nm band for high-level ash