BackForwardInstrument:  MADPI 

Instrument details
Acronym MADPI
Full name Multi-Angle Dual Polarisation Imaging sensor
Purpose Aerosol observation
Short description 3-channel VIS/NIR radiometer operating in the intervals 480-500 nm, 650-675 nm, and 860-880 nm. Two polarisations.
Background New development
Scanning Technique Pushbroom, 2444 x 888 detectors for each polarisation, swath 130 km. Each pixel is viewed under 7 different angles as the satellite moves
Resolution 40 m at s.s.p.
Coverage / Cycle Global in 20 days
Mass Power Data Rate

 

Providing Agency CAST
Instrument Maturity Flown on operational programme
Utilization Period: ≥2017 to ≥2022
Last update: 2016-10-16
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
Mission objectives
Primary mission objectives
  • Aerosol Optical Depth
  • Aerosol column burden
  • Aerosol mass mixing ratio
  • Aerosol type
  • 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
Aerosol column burden5 - marginalCloud sensitive.. Daylight only.VIS (with narrow bandwidth) and NIR channels
Aerosol effective radius5 - marginalCloud sensitive.. Daylight only.VIS (with narrow bandwidth) and NIR channels
Aerosol mass mixing ratio5 - marginalCloud sensitive.. Daylight only.VIS (with narrow bandwidth) and NIR channels
Aerosol Optical Depth5 - marginalCloud sensitive.. Daylight only.VIS (with narrow bandwidth) and NIR channels
Aerosol type5 - marginalCloud sensitive.. Daylight only.VIS (with narrow bandwidth) and NIR channels
Biomass5 - marginalCloud sensitive.. Index only.. Daylight only.VIS and NIR channels. Biomass inferred from NDVI
Cloud cover5 - marginalDaylight only.VIS and NIR channels
Cloud drop effective radius4 - fairAt cloud top.. Daylight only.VIS and NIR channels and different viewing angles (for differentiation).
Cloud ice effective radius4 - fairAt cloud top.. Daylight only.VIS and NIR channels with different viewing angles (for differentiation).
Cloud optical depth3 - highLow-density cloud only.. Daylight only.VIS and NIR channels with different viewing angles
Cloud type3 - highDaylight only.VIS and NIR channels viewing under more angles
Downward short-wave irradiance at Earth surface5 - marginalCloud sensitive.. Highly indirect.VIS and NIR channels
Earth surface albedo2 - very highCloud sensitive.VIS channels with many viewing angles to account for anisotropic reflectivity
Fire fractional cover5 - marginalCloud sensitive.. Coarse spatial resolution.. Daylight only.VIS channels
Leaf Area Index (LAI)5 - marginalCloud sensitive.. Daylight only.VIS and NIR channels. LAI inferred from NDVI
Normalised Difference Vegetation Index (NDVI)2 - very highCloud sensitive.VIS and NIR channels
Photosynthetically Active Radiation (PAR)4 - fairCloud sensitive.VIS channels, range undersampled; a few different viewing angles for irradiance reconstruction
Sea-ice cover5 - marginalCloud sensitive.. Daylight only.VIS and NIR (for contour enhancement) channels
Short-wave cloud reflectance2 - very highNo specific limitation.VIS and NIR channels with multi-viewing and multi-polarisation capabiliy to account for anisotropical reflectance
Snow cover5 - marginalCloud 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 TOA3 - highSpectral interpolation needed.VIS and NIR channels with multi-viewing and multi-polarisation capability to account for anisotropical reflectance
Aerosol volcanic ash5 - marginalCloud sensitive.. Daylight only.VIS and NIR channels
Aerosol volcanic ash (Total column)5 - marginalCloud sensitive.. Daylight only.VIS and NIR channels