BackForwardInstrument:  OCI 

Instrument details
Acronym OCI
Full name Ocean Color Instrument
Purpose Ocean colour, vegetation, aerosol, cloud properties
Short description 24 channels with positions and bandwidths selectable [see detailed characteristics below] - WARNING: specs substantially changes. Those here quoted will be revised.
Background New development
Scanning Technique Pushbroom, swath 1500 km.  Off-nadir view to avoid sun glint
Resolution 1 km
Coverage / Cycle Global coverage in two days, in daylight
Mass 241 kg Power 270 W Data Rate

 

Providing Agency NASA
Instrument Maturity Backed by strong heritage
Utilization Period: TBD
Last update: 2018-06-20
Detailed characteristics
Central wavelength Bandwidth SNR @ specified input spectral radiance
360 nm 15 nm 1125 @ 72.2 W m-2 sr-1 μm-1
385 nm 15 nm 1500 @ 61.1 W m-2 sr-1 μm-1
412 nm 15 nm 1500 @ 78.6 W m-2 sr-1 μm-1
425 nm 15 nm 1500 @ 69.5 W m-2 sr-1 μm-1
443 nm 15 nm 1500 @ 72.2 W m-2 sr-1 μm-1
460 nm 15 nm 1500 @ 68.3 W m-2 sr-1 μm-1
475 nm 15 nm 1500 @ 61.9 W m-2 sr-1 μm-1
490 nm 15 nm 1500 @ 53.1 W m-2 sr-1 μm-1
510 nm 15 nm 1500 @ 45.8 W m-2 sr-1 μm-1
532 nm 15 nm 1500 @ 39.2 W m-2 sr-1 μm-1
555 nm 15 nm 1500 @ 33.9 W m-2 sr-1 μm-1
583 nm 15 nm 1500 @ 28.1 W m-2 sr-1 μm-1
617 nm 15 nm 1500 @ 21.8 W m-2 sr-1 μm-1
640 nm 10 nm 1500 @ 19.0 W m-2 sr-1 μm-1
655 nm 15 nm 1500 @ 16.7 W m-2 sr-1 μm-1
665 nm 10 nm 1500 @ 16.0 W m-2 sr-1 μm-1
678 nm 10 nm 1500 @ 14.5 W m-2 sr-1 μm-1
710 nm 15 nm 1500 @ 11.9 W m-2 sr-1 μm-1
748 nm 10 nm 600 @ 9.3 W m-2 sr-1 μm-1
765 nm 40 nm 600 @ 8.3 W m-2 sr-1 μm-1
820 nm 15 nm 600 @ 5.9 W m-2 sr-1 μm-1
865 nm 40 nm 600 @ 4.5 W m-2 sr-1 μm-1
1245 nm 20 nm 300 @ 0.9 W m-2 sr-1 μm-1
1640 nm 40 nm 250 @ 0.3 W m-2 sr-1 μm-1
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
Mission objectives
Primary mission objectives
  • Aerosol Optical Depth
  • Aerosol column burden
  • Cloud cover
  • Cloud optical depth
  • Cloud type
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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 burden3 - highCloud sensitive.. Daylight only.UV (for absorbing aerosol), VIS (with narrow bandwidth), NIR and SWIR channels including 760 nm for high-level aerosol
Aerosol effective radius3 - highCloud sensitive.. Daylight only.UV (for absorbing aerosol), VIS (with narrow bandwidth), NIR and SWIR channels including 760 nm for high-level aerosol
Aerosol mass mixing ratio3 - highCloud sensitive.. Daylight only.UV (for absorbing aerosol), VIS (with narrow bandwidth), NIR (including 760 nm for high-level aerosol) and SWIR channels
Aerosol Optical Depth3 - highCloud sensitive.. Daylight only.UV (for absorbing aerosol),VIS (with narrow bandwidth), NIR and SWIR channels including 760 nm for high-level aerosol
Aerosol type3 - highCloud sensitive.. Daylight only.UV (for absorbing aerosol), VIS (with narrow bandwidth), NIR and SWIR channels including 760 nm for high-level aerosol
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
Colour Dissolved Organic Matter (CDOM)1 - primaryCloud sensitive.. Daylight only.Many narrow-bandwidth VIS channels, suitable for more water types, in open ocean and coastal zone
Downward short-wave irradiance at Earth surface3 - highCloud sensitive.. Highly indirect.VIS, NIR and SWIR channels
Earth surface albedo5 - marginalCloud sensitive.VIS channels
Fire fractional cover5 - marginalCloud sensitive.. Coarse spatial resolution.. Daylight only.VIS channels
Fraction of Absorbed PAR (FAPAR)3 - highCloud sensitive.VIS channels including Red at 700 nm
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
Ocean chlorophyll concentration 1 - primaryCloud sensitive.. Daylight only.Many narrow-bandwidth VIS channels, suitable for more water types, in open ocean and coastal zone
Ocean Diffuse Attenuation Coefficient (DAC)1 - primaryCloud sensitive.. Daylight only.Many narrow-bandwidth VIS channels, suitable for more water types, in open ocean and coastal zone
Ocean suspended sediments concentration1 - primaryCloud sensitive.. Daylight only.Many narrow-bandwidth VIS channels, suitable for more water types, in open ocean and coastal zone
Oil spill cover5 - marginalCloud sensitive.. Daylight only.VIS channels with narrow bandwidth
Photosynthetically Active Radiation (PAR)3 - highCloud sensitive.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 - 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 TOA4 - fairSpectral interpolation needed.. Information on BRDF needed.UV, VIS, NIR and SWIR channels
Aerosol volcanic ash3 - highCloud sensitive.. Daylight only.UV, VIS, NIR and SWIR channels, including 760 nm for high-level ashes
Aerosol volcanic ash Total Column3 - highCloud sensitive.. Daylight only.UV (specifically sensitive to ash), VIS, NIR and SWIR channels, including 760 nm for high-level ashes