BackForwardInstrument:  MERSI-2 

Instrument details
Acronym MERSI-2
Full name Medium Resolution Spectral Imager -2
Purpose Multi-purpose imagery, including ocean colour
Short description 25-channel VIS/IR spectro-radiometer [see details in table below]
Background Replacing and merging MERSI-1 on FY-3A/3B and VIRR on FY-3A//3B/3C
Scanning Technique Cross-track: 2048 samples for channels at 1000 m resolution at nadir, or 8192 samples for channels at 250 m resolution, swath 2900 km - Along-track: ten 1-km lines every 1.5 s.
Resolution 250 m or 1.0 km at s.s.p.
Coverage / Cycle Global coverage once/day (VIS/NIR/SWIR channels), twice/day (MWIR/TIR).
Mass Power Data Rate

 

Providing Agency CMA
Instrument Maturity Backed by strong heritage
Utilization Period: 2018 to 2025
Last update: 2021-06-17
Detailed characteristics

Center wavelength

Bandwidth

SNR or NEΔT @ specified input

IFOV at s.s.p.

412 nm

20 nm

300 @ 44.9 W m-2 sr-1 μm-1

1000 m

443 nm

20 nm

300 @ 41.9 W m-2 sr-1 μm-1

1000 m

470 nm

50 nm

100 @ 35.3 W m-2 sr-1 μm-1

250 m

490 nm

20 nm

300 @ 32.1 W m-2 sr-1 μm-1

1000 m

550 nm

50 nm

100 @ 29.0 W m-2 sr-1 μm-1

250 m

555 nm

20 nm

500 @ 21 W m-2 sr-1 μm-1

1000 m

650 nm

50 nm

100 @ 22 W m-2 sr-1 μm-1

250 m

670 nm

20 nm

500 @ 10 W m-2 sr-1 μm-1

1000 m

709 nm

20 nm

500 @ 6.9 W m-2 sr-1 μm-1

1000 m

746 nm

20 nm

500 @ 9.6 W m-2 sr-1 μm-1

1000 m

865 nm

20 nm

500 @ 6.4 W m-2 sr-1 μm-1

1000 m

865 nm

50 nm

100 @ 25 W m-2 sr-1 μm-1

250 m

905 nm

20 nm

200 @ 10.0 W m-2 sr-1 μm-1

1000 m

936 nm

20 nm

100 @ 3.6 W m-2 sr-1 μm-1

1000 m

940 nm

50 nm

200 @ 15.0 W m-2 sr-1 μm-1

1000 m

1240 or 1030 nm

(1030 on FY-3F)

20 nm

100 @ 5.4 W m-2 sr-1 μm-1

1000 m

1380 nm

20 or 30 nm

(30 on FY-3F)

60/100 @ 6 W m-2 sr-1 μm-1

1000 m

1640 nm

50 nm

200 @ 7.3 W m-2 sr-1 μm-1

1000 m

2130 nm

50 nm

100 @ 1.2 W m-2 sr-1 μm-1

1000 m

3.80 μm

0.18 μm

0.25 K @ 270 K

1000 m

4.05 μm

0.155 μm

0.25 K @ 300/380 K

1000 m

7.20 μm

0.50 μm

0.30 K @ 270 K

1000 m

8.55 μm

0.30 μm

0.25 K @ 270 K

1000 m

10.8 μm

1.0 μm

0.4 K @ 300 K

250 m

12.0 μm

1.0 μm

0.4 K @ 300 K

250 m

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
  • Subcomponent 1
  • VIS/IR imagery; realisation of a Day/Night band [in SSO]
  • VIS/IR imager [in SSO]
  • Narrow-band or hyperspectral imagers
  • Narrow-band imager (for ocean colour)
Mission objectives
Primary mission objectives
  • Biomass
  • Cloud cover
  • Cloud optical depth
  • Cloud top height
  • Cloud top temperature
  • Cloud type
  • Fraction of Absorbed PAR (FAPAR)
  • Integrated Water Vapour (IWV)
  • Leaf Area Index (LAI)
  • Normalised Difference Vegetation Index (NDVI)
  • Sea surface temperature
  • Sea-ice cover
Evaluation of Measurements