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Total record count: 6269.

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	Eng ID	Term	Definition
	2141	ground control	See CONTROL.
	2142	ground control point	See CONTROL POINT.
	2143	ground distance	The great-circle distance between two ground positions, as contrasted with SLANT DISTANCE. Also called ground range.
	2144	ground effects	Influence exerted by the GROUND on the propagation of ELECTROMAGNETIC WAVES.
	2145	ground ice	See ANCHOR ICE.
	2146	ground layer	Thin layer of air adjacent to the EARTH's surface and of a depth which has been variously given as 10 m to 100 m. Also called surface bound... more Thin layer of air adjacent to the EARTH's surface and of a depth which has been variously given as 10 m to 100 m. Also called surface boundary layer.
	2147	ground log	See LOG.
	2148	ground nadir	See NADIR.
	2149	ground parallel	See PARALLEL.
	2150	ground photograph	See PHOTOGRAPH: TERRESTRIAL.
	2151	ground plane	In PHOTOGRAMMETRY, the horizontal plane passing through the GROUND NADIR of a CAMERA STATION.
	2152	ground range	See GROUND DISTANCE.
	2153	ground resolution	See RESOLUTION.
	2154	ground speed	In AIR NAVIGATION, the rate of motion of an aircraft along its TRACK with relation to the GROUND. See also AIR SPEED.
	2155	ground survey	See SURVEY.
	2156	ground swell	A long high ocean swell; also, this SWELL as it rises to prominent HEIGHT in SHALLOW WATER, however, usually not so high or dangerous as BLI... more A long high ocean swell; also, this SWELL as it rises to prominent HEIGHT in SHALLOW WATER, however, usually not so high or dangerous as BLIND ROLLERS.
	2157	ground truth	The information acquired by a field study to calibrate or verify geographical data acquired by remote sensing.
	2158	ground wave	See WAVE.
	2159	group	A term distinguishing a LIGHT exhibiting two or more flashes or OCCULTATIONS from one exhibiting a single flash or single OCCULTATION.
	2160	group velocity	The VELOCITY of a wave disturbance as a whole, i.e., of an entire group of component simple harmonic waves.
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