BackForwardInstrument:  Trasser 

Instrument details
Acronym Trasser
Full name Polarisation spectro-radiometer
Purpose Study of vegetation processes, ocean colour, aerosol
Short description Based on collinear diffraction of light by ultrasonic waves propagating in an anisotropic crystal (principle of Acousto-Optic Tunable Filters). Spectral range: 430-800 nm; 62 channel, each with V and H polarisation. Spectral resolution ranging from 3 nm at 430 nm to 12 nm at 800 nm
Background New development
Scanning Technique Non-scanning. Pointing 20° ahead, along-track
Resolution 50 km
Coverage / Cycle Global in 10 days for cells of 100 km side
Mass 30 kg Power 285 W Data Rate

 

Providing Agency Roscosmos
Instrument Maturity Flown on operational programme
Utilization Period: 1988 to 2000-09-15
Last update: 2017-03-27
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
  • Biomass
  • Cloud cover
  • Cloud top height
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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.. Daylight only.. Along-track only.VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Aerosol mass mixing ratio5 - marginalCloud sensitive.. Daylight only.. Along-track only.VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Aerosol Optical Depth4 - fairCloud sensitive.. Daylight only.. Along-track only.VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Biomass5 - marginalCloud sensitive.. Index only.. Along-track only.. Daylight only.VIS and NIR channels. Biomass inferred from NDVI
Cloud cover5 - marginalDaylight only.. Along-track only.VIS and NIR channels
Cloud optical depth5 - marginalLow-density cloud only.. Daylight only.. Along-track only.VIS and NIR channels
Cloud top height5 - marginalDaylight only.. Along-track only.NIR channels to estimate the total-column O2 above the cloud top as measured around 760 nm
Cloud type5 - marginalDaylight only.. Along-track only.VIS and NIR channels
Colour Dissolved Organic Matter (CDOM)2 - very highCloud sensitive.. Daylight only.. Along-track only.Many narrow-bandwidth VIS channels, suitable for more water types, in open ocean and coastal zone
Downward short-wave irradiance at Earth surface5 - marginalCloud sensitive.. Highly indirect.. Along-track only.VIS and NIR channels
Earth surface albedo5 - marginalCloud sensitive.. Along-track only.VIS channels
Fire fractional cover5 - marginalCloud sensitive.. Coarse spatial resolution.. Daylight only.. Along-track only.VIS channels
Fraction of Absorbed PAR (FAPAR)3 - highCloud sensitive.. Along-track only.VIS channels including Red at 700 nm
Leaf Area Index (LAI)5 - marginalCloud sensitive.. Daylight only.. Along-track only.VIS and NIR channels. LAI inferred from NDVI
Normalised Difference Vegetation Index (NDVI)3 - highCloud sensitive.. Along-track only.VIS and NIR channels
Ocean chlorophyll concentration 2 - very highCloud sensitive.. Daylight only.. Along-track only.Many narrow-bandwidth VIS channels, suitable for more water types, in open ocean and coastal zone
Ocean Diffuse Attenuation Coefficient (DAC)2 - very highCloud sensitive.. Daylight only.. Along-track only.Many narrow-bandwidth VIS channels, suitable for more water types, in open ocean and coastal zone
Ocean suspended sediments concentration2 - very highCloud sensitive.. Daylight only.. Along-track only.Many narrow-bandwidth VIS channels, suitable for more water types, in open ocean and coastal zone
Oil spill cover4 - fairCloud sensitive.. Daylight only.. Along-track only.VIS channels with narrow bandwidth
Photosynthetically Active Radiation (PAR)3 - highCloud sensitive.. Along-track only.VIS channels, range accurately sampled
Sea-ice cover5 - marginalCloud sensitive.. Daylight only.. Along-track only.VIS and NIR (for contour enhancement) channels
Short-wave cloud reflectance5 - marginalAlong-track only.VIS and NIR channels
Snow cover5 - marginalCloud sensitive.. Daylight only.. Along-track only.VIS and NIR channels
Soil moisture at surface5 - marginalCloud sensitive.. Index only.. Daylight only.. Along-track only.VIS and NIR channels. Soil moisture inferred from differential brightness
Upward short-wave irradiance at TOA5 - marginalSpectral interpolation needed.. Information on BRDF needed.. Along-track only.VIS and NIR channels
Aerosol volcanic ash4 - fairCloud sensitive.. Daylight only.. Along-track only.VIS and NIR channels including 760 nm for high-level ashes
Aerosol volcanic ash (Total column)4 - fairCloud sensitive.. Daylight only.. Along-track only.VIS and NIR channels including 760 nm for high-level ashes