BackForwardInstrument:  SGLI 

Instrument details
Acronym SGLI
Full name Second-generation Global Imager
Purpose Ocean colour, vegetation indexes, aerosol
Short description 19-channel radiometer, 17 narrow-bandwidth in VIS/NIR/SWIR and two broadband in the Thermal IR.  Two channels with three polarisations [see detailed characteristics below]
Background Evolution of GLI flown on ADEOS-2 (2002-2003)
Scanning Technique VNIR: pushbroom; SWIR/TIR: whiskbroom   Swath 1150 km (VNIR and polarimetric channels) or 1400 km (SWIR and TIR channels). Cross-track: 3 CCD of 2000 pixels each of 250 m s.s.p. (non polarimetric channels) and 1 CCD of 1000 pixels of 1 km s.s.p. (polarimetric channels). Along-track tilting capability of ± 45° to avoid sunglint
Resolution 250 m to 1.0 km (see below)
Coverage / Cycle Global coverage in 3 days (in daylight)
Mass 400 kg Power 480 W Data Rate 139 Mbps

 

Providing Agency JAXA
Instrument Maturity Backed by strong heritage
Utilization Period: 2018 to 2025
Last update: 2022-08-01
Detailed characteristics
Central wavelength Bandwidth SNR or NEΔT @ specified input IFOV at s.s.p.
380 nm 10 nm 250 @ 60 W m-2 sr-1 µm-1 250 m
412 nm 10 nm 400 @ 75 W m-2 sr-1 µm-1 250 m
443 nm 10 nm 300 @ 64 W m-2 sr-1 µm-1 250 m
490 nm 10 nm 400 @ 53 W m-2 sr-1 µm-1 250 m
530 nm 20 nm 250 @ 41 W m-2 sr-1 µm-1 250 m
565 nm 20 nm 400 @ 33 W m-2 sr-1 µm-1 250 m
673.5 nm 20 nm 400 @ 23 W m-2 sr-1 µm-1 250 m
673.5 nm 20 nm 250 @ 25 W m-2 sr-1 µm-1 250 m
763 nm 12 nm 1200 @ 40 W m-2 sr-1 µm-1 (@ 1 km) 250 m
868.5 nm 20 nm 400 @ 8 W m-2 sr-1 µm-1 250 m
868.5 nm 20 nm 200 @ 30 W m-2 sr-1 µm-1 250 m
673.5 nm   3 pol 20 nm 250 @ 25 W m-2 sr-1 µm-1 1000 m
868.5 nm   3 pol 20 nm 250 @ 30 W m-2 sr-1 µm-1 1000 m
1050 nm 20 nm 500 @ 57 W m-2 sr-1 µm-1 1000 m
1380 nm 20 nm 150 @ 8 W m-2 sr-1 µm-1 1000 m
1630 nm 200 nm 57 @ 3 W m-2 sr-1 µm-1 250 m
2210 nm 50 nm 211 @ 1.9 W m-2 sr-1 µm-1 1000 m
10.8 µm 0.7 µm 0.2 K @ 300 K 500 m
12.0 µm 0.7 µm 0.2 K @ 300 K 500 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
  • Narrow-band or hyperspectral imagers
  • Narrow-band imager (for ocean colour)
Mission objectives
Primary mission objectives
  • Cloud cover
  • Cloud optical depth
  • Cloud top height
  • Cloud top temperature
  • Cloud type
  • Colour Dissolved Organic Matter (CDOM)
  • Ocean Diffuse Attenuation Coefficient (DAC)
  • Ocean chlorophyll concentration
  • Ocean suspended sediments concentration
  • Oil spill cover
  • Sea-ice cover
Evaluation of Measurements