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Instrument details
Acronym
IIR
Full name
Imaging Infrared Radiometer
Purpose
To support the CALIPSO mission (main instrument: CALIOP, nadir-viewing). Specific for cirrus clouds
Short description
Three-channel IR radiometer [see detailed characteristics below]
Background
Consolidated technology
Scanning Technique
Push-broom, swath 64 km surrounding the CALIOP viewing area
Resolution
1 km
Coverage / Cycle
Global coverage in 16 d (orbit repeat cycle) for cells of 100 km side
Mass
24 kg
Power
27 W
Data Rate
50 kbps
Providing Agency
CNES
Instrument Maturity
Flown on an R&D satellite
Utilization Period:
2006-07-05 to ≥2021
Last update:
2012-09-06
Detailed characteristics
Central wavelength Spectral interval NEΔT @ specified scene temperature 8.65 µm
8.25 - 9.05 µm
0.3 K @ 300 K
10.60 µm
10.2 - 11.0 µm
0.3 K @ 300 K
12.00 µm
11.6 - 12.4 µm
0.3 K @ 300 K
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
No WIGOS subcomponents have been defined.
Mission objectives
Primary mission objectives Cloud cover Cloud top height Cloud top temperature Integrated Water Vapour (IWV) Secondary mission objectives
Opportunity objectives Fire fractional cover Fire radiative power Fire temperature Wind (horizontal) Show all Show fewer
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
Variable Relevance for measuring this variable Operational limitations Explanation
Cloud cover 5 - marginal No specific limitation. TIR channel(s)
Cloud top height 3 - high No specific limitation. TIR channels in window and water vapour band (for emissivity) to estimate cloud top height from its temperature
Cloud top temperature 2 - very high No specific limitation. TIR channels in window and water vapour band (for emissivity)
Fire fractional cover 5 - marginal Cloud sensitive.. Coarse spatial resolution. TIR channels
Fire radiative power 5 - marginal Cloud sensitive.. Coarse spatial resolution. TIR channels
Fire temperature 5 - marginal Cloud sensitive.. Coarse spatial resolution. TIR channels
Land surface temperature 4 - fair Cloud sensitive. TIR split window channels around 11 micrometers for water vapour correction
Sea surface temperature 4 - fair Cloud sensitive. TIR split window channels around 11 micrometers for water vapour correction
Integrated Water Vapour (IWV) 2 - very high Cloud sensitive. TIR channels around 6.3 micrometers and in the 11 micrometers split window
Wind (horizontal) 4 - fair Limited to high latitudes.. Cloud or water vapour tracers needed. TIR channels in the 11 micrometers window and the 6.3 micrometers water vapour band
Instrument: IIR