Use the “Quick Search” box to locate your required term and/or definition. The following “Search conditions” can be used to refine your search: “Contains”, “Begins with”, “Ends with”, “Equals”, “Does not contain” or “Does not equal.”
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 o... 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 glac... 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.