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	Eng ID	Term	Definition
	4181	radarsonde	Equipment used for determining high-level WINDS, by means of RADAR aimed at a TARGET carried by a free balloon.
	4182	radar target	An object which reflects a sufficient amount of a radar signal to produce an echo signal on the radar screen.
	4183	radar view	A depiction (photographic reproduction or drawing) of appearance of LANDMARKS on the PPI scope of a radar set at a particular geographic loc... more A depiction (photographic reproduction or drawing) of appearance of LANDMARKS on the PPI scope of a radar set at a particular geographic location, intended to facilitate the identification of the COAST. This can aid the navigator to identify or match his own radar image of these same LANDMARKS.
	4184	radial	A straight line extending outward from a centre. In PHOTOGRAMMETRY, a line or direction from the RADIAL CENTRE to any point on a PHOTOGRAP... more A straight line extending outward from a centre. In PHOTOGRAMMETRY, a line or direction from the RADIAL CENTRE to any point on a PHOTOGRAPH. The RADIAL CENTRE is assumed to be the PRINCIPAL POINT, unless otherwise designated (e.g., NADIR RADIAL). See also ISORADIAL.
	4185	radial: nadir	A RADIAL from the nadir point. See NADIR: PHOTOGRAPH.
	4186	radial centre	In PHOTOGRAMMETRY, the selected point on a PHOTOGRAPH from which RADIALS (directions) to various IMAGE POINTS are drawn or measured (i.e.,... more In PHOTOGRAMMETRY, the selected point on a PHOTOGRAPH from which RADIALS (directions) to various IMAGE POINTS are drawn or measured (i.e., the origin of RADIALS). The radial centre is either the PRINCIPAL POINT, the nadir point, the ISOCENTRE, or a SUBSTITUTE CENTRE.
	4187	radial distortion	See under DISTORTION.
	4188	radial plot	See RADIAL TRIANGULATION.
	4189	radial triangulation	The aerotriangulation procedure, either graphical or analytical, in which directions from the RADIAL CENTRE, or approximate RADIAL CENTRE, o... more The aerotriangulation procedure, either graphical or analytical, in which directions from the RADIAL CENTRE, or approximate RADIAL CENTRE, of each overlapping PHOTOGRAPH are used for horizontal-control extension by the successive INTERSECTION and RESECTION of these direction lines. A radial triangulation also is correctly called a radial plot or a minor-control plot. If made by analytical methods, it is called an analytical radial triangulation. A radial triangulation is assumed to be graphical unless prefixed by the word analytical.
	4190	radian	The unit of plane angles in the SI SYSTEM.
	4191	radiant energy	See ENERGY.
	4192	radiant flux	See FLUX.
	4193	radiation	Emission or transfer of energy in the form of ELECTROMAGNETIC WAVES or particles. The energy itself is also termed RADIANT ENERGY.
	4194	radiation fog	A major type of FOG, produced over a land area when radiational cooling reduces the air temperature to or below its DEW POINT.
	4195	radio	Communication by ELECTROMAGNETIC WAVES, without a connecting wire. A RADIO RECEIVER. Sometimes called wireless particularly in British termi... more Communication by ELECTROMAGNETIC WAVES, without a connecting wire. A RADIO RECEIVER. Sometimes called wireless particularly in British terminology.
	4196	radio aids	An aid to navigation transmitting information by radio waves.
	4197	radio acoustic ranging	Determining distance by a combination of RADIO and SOUND, the RADIO being used to determine the instant of transmission or reception of the ... more Determining distance by a combination of RADIO and SOUND, the RADIO being used to determine the instant of transmission or reception of the SOUND, and distance being determined by the TIME of transit of SOUND, usually in water. Also called radio acoustic sound ranging. See DISTANCE FINDING STATION, ECHO RANGING, SONOBUOY.
	4198	radio acoustic sound ranging	See RADIO ACOUSTIC RANGING.
	4199	radio altimeter	See ALTIMETER.
	4200	radiobeacon	A RADIO TRANSMITTER which emits a distinctive or characteristic SIGNAL used for the determination of BEARINGS, COURSES or location. One ... more A RADIO TRANSMITTER which emits a distinctive or characteristic SIGNAL used for the determination of BEARINGS, COURSES or location. One intended to mark a specific location is called MARKER BEACON.
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