BackForwardInstrument:  COCTS2 

Instrument details
Acronym COCTS2
Full name China Ocean Colour & Temperature Scanner 2
Purpose Ocean colour and sea surface temperature
Short description 18 channels (2 UV channels, 13 narrow-bandwidth in VNIR, 3 in TIR) [see detailed characteristics below].
Background Updated instrument from COCTS.
Scanning Technique 3000 km swath
Resolution Grond sampling <500m
Coverage / Cycle 1 pass per day for ocean colour and 2 for SST
Mass Power Data Rate

 

Providing Agency NSOAS
Instrument Maturity Flown on operational programme
Utilization Period: 2023 to 2031
Last update: 2023-12-01
Detailed characteristics

Central wavelength

Bandwidth

S/N 

360 nm

20 nm

>1000

385 nm

20 nm

>1000

412 nm

20 nm

>1000

443 nm

20 nm

>1000

490 nm

20 nm

>1000

520 nm

20 nm

>1000

565 nm

20 nm

>1000

620 nm

15 nm

>1000

665 nm

15 nm

>1000

681 nm

15 nm

>1400

705 nm

20 nm

>1000

744 nm

20 nm

>400

865 nm

40 nm

>600

1245 nm

40 nm

>250

1640 nm

80 nm

>180

3.74 μm

190 nm

11.0 μm

1.0 μm

12.0 μm

1.1 μm

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
  • Narrow-band or hyperspectral imagers
  • Narrow-band imager (for ocean colour)
  • High-resolution multi-spectral VIS/IR imagers
  • High-resolution multi-spectral VIS/IR imager
Mission objectives
Primary mission objectives
  • Ocean chlorophyll concentration
  • Ocean suspended sediments concentration
  • Sea surface temperature
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
Biomass4 - fairCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels. Biomass inferred from NDVI and LAI
Cloud cover2 - very highInfrequent coverage.Channels in VIS, NIR, SWIR and the TIR window around 11 micrometers
Cloud drop effective radius3 - highAt cloud top.. Daylight only.. Infrequent coverage.Channels in VIS, NIR and the MWIR window around 3.7 micrometers (for differentiation)
Cloud ice effective radius3 - highAt cloud top.. Daylight only.. Infrequent coverage.Channels in VIS, NIR and the MWIR window around 3.7 micrometers (for differentiation)
Cloud optical depth3 - highLow-density cloud only.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels
Cloud top height4 - fairInfrequent coverage.TIR window channels around 11 micrometers to estimate cloud top height from its temperature
Cloud top temperature4 - fairInfrequent coverage.TIR window channels around 11 micrometers
Cloud type2 - very highInfrequent coverage.Channels in VIS, SWIR and the MWIR and TIR windows around 3.7 and 11 micrometers
Earth surface albedo5 - marginalCloud sensitive.. Infrequent coverage.VIS channels
Fire fractional cover1 - primaryCloud sensitive.. Infrequent coverage.VIS and TIR channels
Fire radiative power1 - primaryCloud sensitive.. Infrequent coverage.MWIR and TIR window channels around 3.7 and 11 micrometers
Fire temperature1 - primaryCloud sensitive.. Infrequent coverage.MWIR and TIR window channels around 3.7 and 11 micrometers
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 channels
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 channels
Land surface temperature3 - highCloud sensitive.. Infrequent coverage.MWIR and TIR window channels around 3.7 and 11 micrometers (high sensitivity to high temperature, cloud impact reduction, water vapour correction)
Leaf Area Index (LAI)2 - very highCloud sensitive.. Daylight only.. Infrequent coverage.VIS, NIR and SWIR channels
Normalised Difference Vegetation Index (NDVI)2 - very highCloud sensitive.. Infrequent coverage.VIS and NIR channels
Photosynthetically Active Radiation (PAR)3 - highCloud sensitive.. Infrequent coverage.VIS channels, range accurately sampled
Sea surface temperature*2 - very highCloud sensitive.. Infrequent coverage.MWIR and TIR window channels (cloud impact reduction, water vapour correction)
Sea-ice cover2 - very highCloud sensitive.VIS, NIR (for contour enhancement), SWIR (for discrimination from clouds) and TIR 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 surface4 - fairCloud sensitive.. Index only.. Infrequent coverage.VIS, NIR, MWIR and TIR channels. Soil moisture inferred from differential brightness and thermal inertia
Soil type1 - primaryCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Integrated Water Vapour (IWV)4 - fairCloud sensitive.. Low troposphere dominant.. Infrequent coverage.TIR channels in the 11 micrometers split window
Upward short-wave irradiance at TOA5 - marginalSpectral interpolation needed.. Information on BRDF needed.. Infrequent coverage.VIS, NIR and SWIR channels
Vegetation type2 - very highCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Aerosol volcanic ash5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels
Aerosol volcanic ash Total Column5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels