EGM2008 Earth Gravitational Model 2008

ENSO El Niño/Southern Oscillation

EOP Earth Orientation Parameters

EPA Environmental Protection Agency

ERS European Remote Sensing

ESA European Space Agency

ETS Episodic Tremor and Slip

FAA Federal Aviation Administration

FEMA Federal Emergency Management Agency

FGCS Federal Geodetic Control Subcommittee

FGDC Federal Geographic Data Committee

GDA Geocentric Datum of Australia

GDGPS Global Differential GPS

GPS Global Positioning System

GEO Group on Earth Observation

GEOINT Geospatial Intelligence

GEOSS Global Earth Observation System of Systems

GFO GeoSat Follow-on Mission

GFZ GeoForschungs Zentrum

GGOS Global Geodetic Observing System

GIA Glacial isostatic adjustment

GIS Geographic Information System

GLONASS Russian GNSS, also known as GLObal’naya NAvigatsionnaya Sputnikovaya Sistema

GMSL Global Mean Sea Level

GNSS Global Navigational Satellite System

GOCE Gravity Field and Steady-state Ocean Circulation Explorer

GPS Global Positioning System

GR General Relativity

GRACE Gravity Recovery and Climate Experiment

GRAIL Gravity Recovery and Interior Laboratory

GRASP Geodetic Reference Antenna in Space

GRAV-D Gravity for the Redefinition of the American Vertical Datum

GRGS Groupe de Raecherche de Géodésie Spatiale

HARNs High Accuracy Reference Networks

HF High Frequency

IAG International Association of Geodesy

IAS International Altimeter Service

ICESat Ice, Cloud, and land Elevation Satellite

IDS International DORIS Service

IERS International Earth Rotation and Reference Systems Service

IGFS International Gravity Field Service

IGN Institut Géographique National

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