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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 PHOTOGRAPH... 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 in... 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.