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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:
2020-12-27 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 imager
Mission objectives
Primary mission objectives Fire fractional cover Fire radiative power Fire temperature Land surface temperature Secondary mission objectives
Opportunity objectives Cloud cover Cloud top temperature Cloud type 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 3 - high Infrequent coverage. Channels in SWIR and the MWIR and TIR windows around 3.7 and 11 micrometers
Cloud top temperature 5 - marginal Infrequent coverage. TIR window channel(s) around 11 micrometers
Cloud type 4 - fair Infrequent coverage. MWIR and TIR window channels around 3.7 and 11 micrometers
Fire fractional cover 1 - primary Infrequent coverage.. Cloud sensitive.. Daylight only. MWIR and TIR window channels around 3.7 and 11 micrometers
Fire radiative power 1 - primary Cloud sensitive.. Infrequent coverage. MWIR and TIR window channels around 3.7 and 11 micrometers
Fire temperature 1 - primary Cloud sensitive.. Infrequent coverage. MWIR and TIR window channels around 3.7 and 11 micrometers
Land surface temperature 3 - high Cloud 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 - high Cloud sensitive.. Daylight only.. Infrequent coverage. NIR and SWIR channels
Sea surface temperature 4 - fair Cloud sensitive.. Infrequent coverage.. Affected by sunlight. MWIR window channel(s) (cloud impact reduction)
Instrument: IRMSS-2 (HJ)