| Acronym | Meaning |
 | GRID | Global Resource Information Database |
| GRID | Graphical Interactive Display |
| GRIP | Greenland Ice Project |
| GRM | Geopotential Research Mission |
| GRO | Global And Remote Observations Section |
| GRP | Geophysical Research Program |
| GSA | General Services Administration |
| GSD | Geographical Situation Display |
| GSD | Geometric Standard Deviation |
| GSE | Ground Support Equipment |
| GSF | Gross Square Feet |
| GSFC | Goddard Space Flight Center |
| GSN | Global Seismic Network |
| GSOP | Ground Systems Operations |
| GSOS | GPS Surface Observing System |
| GSP | Geophysical Statistics Project |
| GST | GPS Science And Technology Program |
| GSTS | Ground Surveillance And Tracking System |
| GSWM | Global Scale Wave Model |
| GTC | Gigatons Of Carbon |
| GTCP | Global Tropospheric Chemistry Program |
| GTCSM | Global Tropospheric Chemistry Systems Model |
| GTE | Global Tropospheric Experiment |
| GTE/TRACE | Global Tropospheric Experiment/Transport And Atmospheric Chemistry Near The Equator |
| GTF | Ground Test Facility |
| GTG | GARP Task Group |
| GTMS | Global Thermospheric Mapping Study |
| GTN | Germantown |
| GTOS | Global Terrestrial Observing System |
| GTP | Geophysical Turbulence Program |
| GTS | Global Telecommunication System |
| GUI | Graphical User Interface |
| GUISE | Group For Unidata Interface Software Exploration |
| GVAR | GOES Variable |
| GVHRR | Geosynchonous Very High Resolution Radiometer |
| GVHRR | Geostationary VHRR |
| GWC | Global Weather Center |
| GWE | Global Weather Experiment |
| GWEN | Ground Wave Emergency Network |
| GWP | Global Warming Potential |
| GWP | Global Warming Potential |
| GWPA | Ground Water Protection Act |
| GWS | Gateway Service |
| GZ | Ground Zero |
| H | Henry |
| H | Hecto |
| H/W | Hardware |
| HAC | Heads And Chairs |
| HADS | Hydrometeorological Automated Data System |
| HAILSWATH | South Dakota Hail Studies |
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