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Eng ID Term Definition
1021
contrast
In PHOTOGRAPHY, the actual difference in DENSITY between the highlights and the shadows on a NEGATIVE or POSITIVE. Contrast is not concerned... more
In PHOTOGRAPHY, the actual difference in DENSITY between the highlights and the shadows on a NEGATIVE or POSITIVE. Contrast is not concerned with the magnitude of DENSITY but only with the difference in DENSITIES. Also the rating of a photographic material corresponding to the relative density difference which it exhibits.
1022
control
A system of points with established POSITIONS or ELEVATIONS, or both, which are used as fixed references in positioning and correlating map ... more
A system of points with established POSITIONS or ELEVATIONS, or both, which are used as fixed references in positioning and correlating map features. Control is generally classified in four orders (with first order denoting highest quality) according to the PRECISION of the methods and instruments used in establishing it, and the ACCURACY of the resultant POSITIONS and ELEVATIONS. Often calledbasic control. Regulation or direction of a machine, electronic equipment, etc.; or the DIAL, knob, switch, etc. for performing this function. The exercise of directing influence over the movements of a craft or missile, with particular reference to changes in direction and SPEED.
1023
control: astronomical
CONTROL determined from ASTRONOMICAL OBSERVATIONS.
1024
control: basic
See CONTROL.
1025
control: geodetic
A system of CONTROL STATIONS established by geodetic methods. See SURVEY: GEODETIC.
1026
control: ground
CONTROL established by GROUND SURVEYS, as distinguished from CONTROL established by photogrammetric methods.
1027
control: horizontal
CONTROL that is determined in horizontal POSITION. The POSITION may be referred to any recognized geographic or plane coordinate system.
1028
control: minor
See CONTROL: PHOTOGRAMMETRIC.
1029
control: photogrammetric
CONTROL established by photogrammetric methods, as distinguished from CONTROL established by ground methods. Also called minor control.
1030
control: supplemental
Points established by subordinate SURVEYS, to relate AERIAL PHOTOGRAPHS used in mapping with the system of GEODETIC CONTROL. The points must... more
Points established by subordinate SURVEYS, to relate AERIAL PHOTOGRAPHS used in mapping with the system of GEODETIC CONTROL. The points must be positively photo-identified, that is, the points on the GROUND must be positively correlated with their IMAGES on the PHOTOGRAPHS.
1031
control: vertical
CONTROL determined in ELEVATION relative to a DATUM PLANE.
1032
controlled mosaic
See MOSAIC.
1033
controlling depth
See DEPTH.
1034
control mark
A specific object on the ground whose position and/or elevation has been determined or is to be determined.
1035
control point
A point on the ground whose position (horizontal and vertical) is used as a base for a dependent survey. Also referred to as control statio... more
A point on the ground whose position (horizontal and vertical) is used as a base for a dependent survey. Also referred to as control station.- 2. In photogrammetry, any point in a horizontal and vertical control system that is identified on a photograph and used for correlating the data shown on that photograph. More specific terms are photo-control point, picture control point and ground control point.
1036
control station
See CONTROL POINT .
1037
convection
In general, mass motions within a fluid resulting in TRANSPORT and mixing of the properties of that fluid. In the ATMOSPHERE, organized inte... more
In general, mass motions within a fluid resulting in TRANSPORT and mixing of the properties of that fluid. In the ATMOSPHERE, organized internal motions within a LAYER of air, leading to vertical transport of heat, momentum, etc.
1038
convection: forced
In the ATMOSPHERE, CONVECTION caused by mechanical forces, such as those arising from air motion over a rough or sloping surface.
1039
convection: free
In the ATMOSPHERE, CONVECTION caused by density differences within the air.
1040
convergence
In OCEANOGRAPHY, a situation whereby waters of different origins come together at a point or, more commonly, along a line known as a converg... more
In OCEANOGRAPHY, a situation whereby waters of different origins come together at a point or, more commonly, along a line known as a convergence line. Along such a line the denser water from one side sinks under the lighter water from the other side. See SINKING.