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GAW Global Atmosphere Watch (WMO Atmospheric Research Environment Programme)
GCOM Global Change Observation Mission (NASDA)
GCOS Global Climate Observing System
GDPT Chinese Delayed Picture Transmission Format (Global Data) (FY-1C)
GDS Ground Data System
GEO Inter-governmental Group on Earth Observations
GEOSS Global Earth Observation System of Systems
GERB Geostationary Earth Radiation Budget (MSG, EUMETSAT)
GESN Global Education and Science Network
GEWEX Global Energy and Water Cycle Experiment (WCRP)
GFCS Global Framework for Climate Services
GIFTS Geosynchronous Imaging Fourier Transform Spectrometer (NASA)
GISC Global Information System Centre (WIS, WMO)
GIMTACS GOES I-M Telemetry and Command System
GLI Generation Global Imager (GCOM)
GLM Geostationary Lightning Mapper (GOES, NOAA)
GLOBUS Multichannel scanning radiometer (Meteor-3M N2)
Glory CCRI global distribution of natural and anthropogenic aerosols mission (NASA)
GMES Global Monitoring for Environment and Security (EU)
GMR GOES Meteosat Relay
GMS Geostationary Meteorological Satellite (Japan)
GNSS Global Navigation Satellite System
GOCE Gravity Field and Steady State Ocean Circulation Explorer (ESA)
GOES Geostationary Operational Environmental Satellite (USA)
GOME Global Ozone Monitoring Experiment (Metop, ERS)
GOMS Geostationary Operational Meteorological Satellite (Russ. Fed.)
GOMAS Geostationary Observatory for Microwave Atmospheric Sounding (WMO)
GOOS Global Ocean Observing System (IOC, UNEP, WMO, ICSU)
GOS Global Observing System (WMO)
GOSAT Greenhouse Gases Observing Satellite (JAXA/Jap. Min. of Environment)
GSLMP Global Sea Level Monitoring Programme
GPCP Global Precipitation Climatology Project
GPM Global Precipitation Measurement (JAXA/NASA)
GPS Global Positioning System
GRA GOOS Regional Alliances
GRACE Gravity Recovery and Climate Experiment (NASA/DLR)
GRAS GNSS Receiver for Atmospheric Sounding
GRIB Data representation form for General Regularly-distributed Information in Binary (WMO)
GRP GEWEX Radiation Panel (GEWEX, WCRP)
GSICS Global Satellite Intercalibration System
GTS Global Telecommunication System (WMO)
GVAR GOES Variable (data format) (USA)