WMO OSCAR | Details for Instrument Trasser

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Instrument: 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
Last update:	2018-03-19

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

Okean Operational 1 (NSAU)
- Okean-O1-3 (see instrument status) Oct 1988 - Jul 1990
Okean-O (NSAU)
- Okean-O-1 (see instrument status) Oct 1999 - Sep 2000

Instrument classification

Earth observation instrument
Passive optical radiometer or spectrometer
Moderate resolution optical imager

WIGOS Subcomponents No WIGOS subcomponents have been defined.

Mission objectives

Primary mission objectives

Aerosol Optical Depth
Aerosol column burden
Aerosol effective radius
Biomass
Cloud cover
Cloud top height
Colour Dissolved Organic Matter (CDOM)
Earth surface albedo
Fraction of Absorbed PAR (FAPAR)
Leaf Area Index (LAI)
Normalised Difference Vegetation Index (NDVI)
Ocean Diffuse Attenuation Coefficient (DAC)
Ocean chlorophyll concentration
Ocean suspended sediments concentration
Oil spill cover
Photosynthetically Active Radiation (PAR)

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.

Search:

Variable	Relevance for measuring this variable	Operational limitations	Explanation
Colour Dissolved Organic Matter (CDOM)*	1 - primary	Cloud sensitive.. Daylight only.. Along-track only.	Many narrow-bandwidth VIS channels, suitable for more water types, in open ocean and coastal zone
Ocean chlorophyll concentration *	1 - primary	Cloud 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)*	1 - primary	Cloud 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 concentration*	1 - primary	Cloud sensitive.. Daylight only.. Along-track only.	Many narrow-bandwidth VIS channels, suitable for more water types, in open ocean and coastal zone
Aerosol column burden*	3 - high	Cloud sensitive.. Daylight only.. Along-track only.	VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Aerosol effective radius*	3 - high	Daylight only.. Along-track only.. Cloud sensitive.	VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Aerosol mass mixing ratio	3 - high	Cloud sensitive.. Daylight only.. Along-track only.	VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Aerosol Optical Depth*	3 - high	Cloud sensitive.. Daylight only.. Along-track only.	VIS (with narrow bandwidth) and NIR channels including 760 nm for high-level aerosol
Fraction of Absorbed PAR (FAPAR)*	3 - high	Cloud sensitive.. Along-track only.	VIS channels including Red at 700 nm
Normalised Difference Vegetation Index (NDVI)*	3 - high	Cloud sensitive.. Along-track only.	VIS and NIR channels
Photosynthetically Active Radiation (PAR)*	3 - high	Cloud sensitive.. Along-track only.	VIS channels, range accurately sampled
Aerosol volcanic ash	3 - high	Cloud sensitive.. Daylight only.. Along-track only.	VIS and NIR channels including 760 nm for high-level ashes
Aerosol volcanic ash Total Column	3 - high	Cloud sensitive.. Daylight only.. Along-track only.	VIS and NIR channels including 760 nm for high-level ashes
Cloud optical depth	4 - fair	Low-density cloud only.. Daylight only.. Along-track only.	VIS and NIR channels
Leaf Area Index (LAI)*	4 - fair	Cloud sensitive.. Daylight only.. Along-track only.	VIS and NIR channels. LAI inferred from NDVI
Snow cover	4 - fair	Cloud sensitive.. Daylight only.. Along-track only.	VIS and NIR channels
Biomass*	5 - marginal	Cloud sensitive.. Index only.. Along-track only.. Daylight only.	VIS and NIR channels. Biomass inferred from NDVI
Cloud cover*	5 - marginal	Daylight only.. Along-track only.	VIS and NIR channels
Cloud top height*	5 - marginal	Daylight only.. Along-track only.	NIR channels to estimate the total-column O2 above the cloud top as measured around 760 nm
Cloud type	5 - marginal	Daylight only.. Along-track only.	VIS and NIR channels
Downward short-wave irradiance at Earth surface	5 - marginal	Cloud sensitive.. Highly indirect.. Along-track only.	VIS and NIR channels
Earth surface albedo*	5 - marginal	Cloud sensitive.. Along-track only.	VIS channels
Fire fractional cover	5 - marginal	Cloud sensitive.. Coarse spatial resolution.. Daylight only.. Along-track only.	VIS channels
Oil spill cover*	5 - marginal	Cloud sensitive.. Daylight only.. Along-track only.	VIS channels with narrow bandwidth
Short-wave cloud reflectance	5 - marginal	Along-track only.	VIS and NIR channels
Soil moisture at surface	5 - marginal	Cloud sensitive.. Index only.. Daylight only.. Along-track only.	VIS and NIR channels. Soil moisture inferred from differential brightness
Upward short-wave irradiance at TOA	5 - marginal	Spectral interpolation needed.. Information on BRDF needed.. Along-track only.	VIS and NIR channels
Sea-ice cover	5 - marginal	Cloud sensitive.. Daylight only.. Along-track only.	VIS and NIR (for contour enhancement) channels

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