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	Eng ID	Term	Definition
	2041	geomagnetic field	The MAGNETIC FIELD of the EARTH. Also called terrestrial magnetic field or earth's magnetic field.
	2042	geomagnetism	The MAGNETISM of the EARTH. Also called terrestrial magnetism.
	2043	geomatics	The science and technology of spatial information management, including the acquisition, storage, analysis and processing, display and dis... more The science and technology of spatial information management, including the acquisition, storage, analysis and processing, display and dissemination of geo-referenced information.
	2044	geometric dilution of precision	See DILUTION OF PRECISION.
	2045	geometric latitude	See LATITUDE: PARAMETRIC.
	2046	geometric projection	See PROJECTION: PERSPECTIVE.
	2047	geomorphology	A branch of both geography and geology that deals with the form of the earth, the general configuration of its surface, and the changes that... more A branch of both geography and geology that deals with the form of the earth, the general configuration of its surface, and the changes that take place in the evolution of land forms.
	2048	geophysics	The study of the physical characteristics and properties of the EARTH.
	2049	geosphere	The solid and liquid portions of the EARTH; the LITHOSPHERE plus the HYDROSPHERE.
	2050	geostationary satellite	An earth satellite moving eastward in an equatorial, circular orbit at an altitude (approximately 35,900 kilometers) such that its period ... more An earth satellite moving eastward in an equatorial, circular orbit at an altitude (approximately 35,900 kilometers) such that its period of revolution is exactly equal to (synchronous with) the rotational period of the earth. Such a satellite will remain fixed over a point on the earth's equator. Although geostationary satellites are frequently called geosynchronous or synchronous satellites, the orbit of an eastward moving synchronous satellite must be equatorial if the satellite is to remain fixed over a point on the equator. Otherwise, the satellite moves daily in a figure-eight pattern relative to the earth. Also called fixed satellite.
	2051	geostrophic wind	That horizontal wind velocity for which the Coriolis force exactly balances the horizontal pressure force.
	2052	gibbous	adj.). See PHASES OF THE MOON.
	2053	gimbals	A device consisting of two rings pivoted at right angles to each other, for supporting anything, such as an instrument, in such a manner tha... more A device consisting of two rings pivoted at right angles to each other, for supporting anything, such as an instrument, in such a manner that it will remain essentially horizontal when the support tilts. Also called cardanic suspension.
	2054	glacier	A mass of SNOW and ICE continuously moving from higher to lower GROUND or, if afloat, continuously spreading. The principal forms of g... more A mass of SNOW and ICE continuously moving from higher to lower GROUND or, if afloat, continuously spreading. The principal forms of glaciers are: ICE SHEETS, ICE SHELVES, ICE CAPS, ICE PIEDMONTS, and various types of mountain glaciers.
	2055	glacier ice	Any ICE floating on the SEA as an ICEBERG, which originates from a land GLACIER. Also called land ice.
	2056	glacier tongue	Projecting seaward extension of GLACIER, usually afloat.
	2057	glaciology	The study of SNOW and ICE on the EARTH's surface, with specific concentration on the regime of active GLACIERS.
	2058	glen	A narrow, secluded VALLEY.
	2059	glitter	The spots of light reflected from a point source by the surface of the SEA.
	2060	Global Positioning System (GPS)	A satellite-based NAVIGATION system designed to provide highly accurate POSITION and velocity information in three dimensions and precise t... more A satellite-based NAVIGATION system designed to provide highly accurate POSITION and velocity information in three dimensions and precise time and time interval on a global basis continuously. GPS is operated by the United States Government. GPS to which differential corrections have been applied is known as DIFFERENTIAL GPS (DGPS). See also GLOBAL NAVIGATION SATELLITE SYSTEM.
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