| Acronym | Meaning |
 | GEOSIF | Geoscientific Information Framework |
| GEU | Gyro Electronics Unit |
| GEWEX | Global Energy And Water Cycle Experiment |
| GEWEX | Continental-Scale Project |
| GF | Gigaflops |
| GFDL | Geophysical Fluid Dynamics Laboratory |
| GFE | Government Furnished Equipment |
| GFLOPS | Gigaflops |
| GFP | Government Furnished Property |
| GFS | Global Forecast System |
| GFY | Government Fiscal Year |
| GGEM | Gravity Gradiometer Explore Mission |
| GGI | GPS Geoscience Instrument |
| GGNS | Grand Gulf Nuclear Station |
| GGS | Global Geospace Science Program |
| GGS | Global Geospace Study |
| GHB | Goddard Handbook |
| GHOST | Global Horizontal Sounding Technique |
| GHRS | Goddard High Resolution Spectograph |
| GHZ | Giga Hertz |
| GIF | Graphics Interchange Format |
| GIIS | General Instrument Interface Specification |
| GIMMS | Global Inventory And Monitoring And Modeling Study |
| GIMPAP | GOES Product Assurance Plan |
| GINI | GOES Ingest & NOAAPORT Interface |
| GIPS | Billions Of Instructions Per Second |
| GIS | Geographic Information Systems |
| GISMOS | Global Incoherent Scatter Measurements Of Substorms |
| GISP | Greeland Ice Sheet Program |
| GISS | Goddard Institute For Space Studies |
| GISST | Global Sea Ice And Sea Surface Temperature |
| GKS | Graphic Kernal System |
| GLA | Goddard Laboratory Of The Atmospheres |
| GLAS | Goddard Laboratory For Atmospheric Science |
| GLERL | Great Lakes Environmental Research Lab |
| GLGS | GOES Local Groundstation System |
| GLIS | Global Land Information System |
| GLOBE | Global Learning And Observations To Benefit The Environment |
| GLOBEC | Global Ocean Ecosystems Dynamics |
| GLOCHEM | Global Atmospheric Chemistry (or Chemical) Survey |
| GLOMAC | Part Of EUROTRAC |
| GLONET | Global Ozone Observing System |
| GLRS | Geodynamics (or Geoscience) Laser Ranging System |
| GLS | GOMR Limb Sounder |
| GLWQA | Great Lakes Water Quality Agreement |
| GM | General Motors |
| GMCC | Geophysical Monitoring For Climatic Change |
| GMD | Geometric Mean Diameter |
| GMD-1 | N/A |
| GMP | Ground Water Monitoring Plan |
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