BackForwardInstrument:  IRMSS-2 (HJ) 

Instrument details
Acronym IRMSS-2 (HJ)
Full name Infrared Multispectral Scanner - 2
Purpose Land observation for natural disasters monitoring
Short description 4-channnel NIR/SWIR/MWIR/TIR radiometer [see detailed characteristics below]
Background Developed after the IRMSS flown on HJ-1 A/B
Scanning Technique Pushbroom. Swath 720 km
Resolution 48 m at s.s.p.
Coverage / Cycle Global coverage in 4 days
Mass Power Data Rate

 

Providing Agency CAST
Instrument Maturity Flown on operational programme
Utilization Period: 2020 to 2025
Last update: 2021-06-16
Detailed characteristics

Central wavelength

Spectral interval

SNR or NEΔT @ specified input

0.925 µm

0.75-1.1 µm

…… @ ….. % albedo

1.65 µm

1.55-1.75 µm

…… @ ….. % albedo

3.7 µm

3.50-3.90 µm

…… @ ….. % albedo

11.5 µm

10.5-12.5 µm

….. K @ …… 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
  • High resolution optical imager
WIGOS Subcomponents
  • Subcomponent 1
  • High-resolution multi-spectral VIS/IR imagers
  • High-resolution multi-spectral VIS/IR imager
Mission objectives
Primary mission objectives
  • Fire fractional cover
  • Fire radiative power
  • Fire temperature
  • Land surface temperature
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
Cloud cover3 - highInfrequent coverage.Channels in SWIR and the MWIR and TIR windows around 3.7 and 11 micrometers
Cloud top temperature5 - marginalInfrequent coverage.TIR window channel(s) around 11 micrometers
Cloud type4 - fairInfrequent coverage.MWIR and TIR window channels around 3.7 and 11 micrometers
Fire fractional cover*1 - primaryInfrequent coverage.. Cloud sensitive.. Daylight only.MWIR and TIR window channels around 3.7 and 11 micrometers
Fire radiative power*1 - primaryCloud sensitive.. Infrequent coverage.MWIR and TIR window channels around 3.7 and 11 micrometers
Fire temperature*1 - primaryCloud sensitive.. Infrequent coverage.MWIR and TIR window channels around 3.7 and 11 micrometers
Land surface temperature*3 - highCloud sensitive.. Infrequent coverage.MWIR and TIR window channels around 3.7 and 11 micrometers (high sensitivity to high temperature, cloud impact reduction, water vapour correction)
Leaf Area Index (LAI)3 - highCloud sensitive.. Daylight only.. Infrequent coverage.NIR and SWIR channels
Sea surface temperature4 - fairCloud sensitive.. Infrequent coverage.. Affected by sunlight.MWIR window channel(s) (cloud impact reduction)