Second Generation Global Imager (SGLI)

The Second Generation Global Imager is a passive optical multi-channel radiometer carried by GCOM-C / Shikisai.^[1][2] It combines VNR and IRS components across 19 channels, covering 380 nm to 12 um.^[1][3] The VNR side includes 11 non-polarization nadir channels plus two polarization/slant-view channels; the IRS side includes four SWIR and two thermal infrared channels.^[1][3] Native spatial resolution is channel dependent, from 250 m to 1 km, with WMO listing the thermal infrared channels at 500 m.^[1][3] Swath is roughly 1000 km or more depending on channel, with VNR and polarimetric channels documented at 1150 km and SWIR/TIR channels at 1400 km.^[1][3] Demonstrated uses include ocean-colour water-leaving radiance, multi-angle polarimetry, sea-surface-temperature retrieval and vegetation-index mapping on GCOM-C.^[1][3][2] SGLI succeeds GLI on ADEOS-II and is useful where one payload needs ocean, land, atmosphere, snow, ice and thermal observations from a consistent mission series.^[1][3]