BackForwardInstrument:  GF-4 imager 

Instrument details
Acronym GF-4 imager
Full name Imager of GaoFen-4
Purpose Disaster monitoring from geostationary orbit
Short description Detailed instrument description not yet available. It should be a two-channel imager, one panchromatic, one in the MWIR around 3.7 μm.
Background New development
Scanning Technique Whiskbroom, scanning areas of 400 km x 400 km size, addressable within a Field Of Regard of 7000 km x 7000 km centred over China, with temporal resolution at minute-level
Resolution Panchromatic: 50 m; MWIR: 400 m; over the Chinese area
Coverage / Cycle Local coverage over China at minute-level
Mass Power Data Rate

 

Providing Agency CNSA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2016-06-13 to ≥2023
Last update: 2017-03-29
Detailed characteristics
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
Mission objectives
Primary mission objectives
  • Fire fractional cover
  • Fire radiative power
  • Fire temperature
  • Land surface temperature
  • Sea surface temperature
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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
VariableRelevance for measuring this variableOperational limitationsExplanation
Cloud cover5 - marginalInfrequent coverage.. Daylight only.Panchromatic channel
Fire fractional cover2 - very highInfrequent coverage.. Cloud sensitive.. Daylight only.MWIR window channel(s) around 3.7 micrometers
Fire radiative power3 - highCloud sensitive.. Infrequent coverage.MWIR window channel(s) around 3.7 micrometers
Fire temperature3 - highCloud sensitive.. Infrequent coverage.MWIR window channel(s) around 3.7 micrometers
Glacier cover5 - marginalCloud sensitive.. Long time for mapping.. Daylight only.Panchromatic channel with high resolution, for glacier boundary detection
Land surface temperature4 - fairCloud sensitive.. Infrequent coverage.. Affected by sunlight.MWIR window channel(s) around 3.7 micrometers (high sensitivity to high temperature, cloud impact reduction)
Sea surface temperature4 - fairCloud sensitive.. Infrequent coverage.. Affected by sunlight.MWIR window channel(s) (cloud impact reduction)
Snow cover5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.Panchromatic channel