BackForwardInstrument:  GMI (GF-5) 

Instrument details
Acronym GMI (GF-5)
Full name Greenhouse-gases Monitoring Instrument
Purpose CO2 and CH4 profiles
Short description 4-band NIR/SWIR grating spectrometer [see detailed characteristics below]
Background Heritage of the Orbiting Carbon Observatory (OCO), flown on OCO-2
Scanning Technique Mechanical cross-track scanning. Five cross-track samples at about 150 km distance, along-track sampling at about 130 km distance. Swath about 800 km
Resolution 10.3 km at the s.s.p.
Coverage / Cycle Global in 5 days, in daylight
Mass 109 kg Power 120 W Data Rate 30 Mbps


Providing Agency CNSA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2018 to 2030
Last update: 2021-06-16
Detailed characteristics


Central wavelength

Spectral range

Spectral resolution

SNR @ 30 % albedo


765 nm

759-769 nm

0.027 nm



1575 nm

1568-1583 nm

0.067 nm



1650 nm

1642-1658 nm

0.067 nm



2050 nm

2043-2058 nm

0.113 nm


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
  • Cross-nadir shortwave (UV/VIS) sounder
WIGOS Subcomponents
  • Subcomponent 1
  • UV/VIS/NIR sounders, nadir and limb
  • UV/VIS/NIR nadir sounder
Mission objectives
Primary mission objectives
  • CH4
  • CO2
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
CH4*1 - primaryCloud sensitive.. Daylight only.Very-high resolution SWIR spectrometry. CH4 lines around 1.65 micrometers. Specifically designed for CH4.
CO2*1 - primaryCloud sensitive.. Daylight only.Very-high resolution SWIR spectrometry CO2 lines around 1.6 and 2.1 micrometers. Specifically designed for CO2.