BackForwardInstrument:  HAOC 

Instrument details
Acronym HAOC
Full name High Accuracy On-board Calibrator
Purpose To provide an absolute radiance reference for VIS/SWIR observations.
Short description A VIS/SWIR imaging spectrometer. Through its high-precision spectral imaging observations of the Earth and the Moon, it can achieve radiation reference transfer to other optical imagers on different platforms. Spectral range: 440 to 1,060 nm with 4-nm sampling. Radiometric accuracy 2%.
Background Instrument to support climate quality radiance measurements in the VIS/SWIR spectral regions.
Scanning Technique Push broom
Resolution Spatial resolution <250 m
Coverage / Cycle 50 km wide swath comprised of 536 discrete pixels segmented into 268 FOVs
Mass Power Data Rate

 

Providing Agency CMA
Instrument Maturity Demonstration pending
Utilization Period: 2023 to 2028
Last update: 2024-02-05
Detailed characteristics
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
  • Subcomponent 1
  • On-orbit measurement reference standards for VIS/NIR, IR, MW absolute calibration.
  • On-orbit measurement reference standards for VIS/NIR, IR, MW absolute calibration.
Mission objectives
Primary mission objectives
  • Earth surface albedo
  • Short-wave cloud reflectance
  • Upward short-wave irradiance at TOA
  • Upward spectral radiance at TOA
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
Biomass5 - marginalCloud sensitive.. Index only.. Daylight only.VIS and NIR channels. Biomass inferred from NDVI
Cloud cover5 - marginalDaylight only.VIS and NIR channels
Cloud optical depth4 - fairLow-density cloud only.. Daylight only.VIS and NIR channels
Cloud type5 - marginalDaylight only.VIS and NIR channels
Downward short-wave irradiance at Earth surface5 - marginalCloud sensitive.. Highly indirect.VIS and NIR channels
Earth surface albedo*5 - 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)4 - fairCloud sensitive.. Daylight only.VIS and NIR channels. LAI inferred from NDVI
Normalised Difference Vegetation Index (NDVI)3 - highCloud sensitive.VIS and NIR channels
Photosynthetically Active Radiation (PAR)3 - highCloud sensitive.VIS channels, range accurately sampled
Short-wave cloud reflectance*5 - marginalNo specific limitation.VIS and NIR channels
Snow cover4 - fairCloud sensitive.. Daylight only.VIS and NIR channels
Soil moisture at surface5 - marginalCloud sensitive.. Index only.. Daylight only.VIS and NIR channels. Soil moisture inferred from differential brightness
Upward short-wave irradiance at TOA*5 - marginalSpectral interpolation needed.. Information on BRDF needed.VIS and NIR channels
Aerosol volcanic ash5 - marginalCloud sensitive.. Daylight only.VIS and NIR channels
Aerosol volcanic ash Total Column5 - marginalCloud sensitive.. Daylight only.VIS and NIR channels