EO·Atlas
Geostationary Environment Monitoring Spectrometer (GEMS)
Compiled from public sources on 2026-06-16. Not independently verified by Ball Aerospace (BAE Systems Space).
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Geostationary atmospheric-composition spectrometer flown on GEO-KOMPSAT-2B.
Geostationary Environment Monitoring Spectrometer (GEMS) is an operational geostationary UV-visible hyperspectrometer on GEO-KOMPSAT-2B, launched in February 2020.[1][2] It measures sulfur dioxide, nitrogen dioxide, ozone, formaldehyde, and aerosols over East and Southeast Asia from geostationary orbit.[1] Its documented instrument class is a UV/VIS grating imaging spectrometer with a 300-500 nm range, spectral resolution below 0.6 nm, hourly daylight coverage over 5 S to 45 N and 75 E to 145 E, and 5 km resolution over Korea.[2]
Tropospheric nitrogen dioxide and sulfur dioxide column retrieval is demonstrated on GEO-KOMPSAT-2B.[1] Peer-reviewed validation work documents GEMS polarization characteristics and a correction algorithm, which matters for users evaluating radiometric stability and trace-gas retrieval quality in the UV-visible range.[3] GEMS supports regional air-quality and atmospheric-composition monitoring that needs frequent daylight geostationary refresh over Asia rather than global polar-orbit coverage.[1][2]
Pricing not publicly listed by operator
Compositional position
- Tropospheric column mapping (NO2/SO2)via GEO-KOMPSAT-2B
GEMS demonstrates geostationary tropospheric column mapping for air-quality species on GEO-KOMPSAT-2B.
None on record.
- [1]Introduction to GEMS onboard GK-2Bagency doc2026-06-16
- [2]WMO OSCAR instrument record: GEMSagency doc2026-06-16
- [3]Geostationary Environment Monitoring Spectrometer (GEMS) polarization characteristics and correction algorithmpeer reviewed2026-06-16
- [4]GEMS factsheetoperator datasheet2026-06-16