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	Eng ID	Term	Definition
	5821	valley line	See TALWEG.
	5822	vane	A device to indicate the direction from which the WIND blows. Also called weather vane, wind vane. See ANEMOMETER. A SIGHT on an instrument ... more A device to indicate the direction from which the WIND blows. Also called weather vane, wind vane. See ANEMOMETER. A SIGHT on an instrument used for observing BEARINGS, as on a PELORUS, BEARING CIRCLE, etc. Also called sight (or sighting) vane. A device to indicate the direction toward which the CURRENT flows.
	5823	vanishing line	In PHOTOGRAMMETRY, the straight line on a PHOTOGRAPH upon which lie all the VANISHING POINTS of all systems of parallel lines parallel to o... more In PHOTOGRAMMETRY, the straight line on a PHOTOGRAPH upon which lie all the VANISHING POINTS of all systems of parallel lines parallel to one plane.
	5824	vanishing point	In PHOTOGRAMMETRY, the IMAGE in the plane of a PHOTOGRAPH, of the point toward which a system of parallel lines in the object space conver... more In PHOTOGRAMMETRY, the IMAGE in the plane of a PHOTOGRAPH, of the point toward which a system of parallel lines in the object space converges.
	5825	vanishing tide	See TIDE.
	5826	variate	A variate is a quantity that may take on any of the values of a specified set with a specified relative frequency or probability often known... more A variate is a quantity that may take on any of the values of a specified set with a specified relative frequency or probability often known as random variable. It is to be regarded as defined not merely by a set of permissible values, but by an associated frequency (probability) function expressing how often those values appear in a given situation.
	5827	variation	The angle between the MAGNETIC and GEOGRAPHICAL MERIDIANS at any place, expressed in DEGREES east or west to indicate the direction of MAG... more The angle between the MAGNETIC and GEOGRAPHICAL MERIDIANS at any place, expressed in DEGREES east or west to indicate the direction of MAGNETIC NORTH from TRUE NORTH. Also calledmagnetic variation,or magnetic declination.
	5828	variation: grid	Angular difference in direction between GRID NORTH and MAGNETIC NORTH. It is measured east or west from GRID NORTH. Also called grivation, ... more Angular difference in direction between GRID NORTH and MAGNETIC NORTH. It is measured east or west from GRID NORTH. Also called grivation, or grid magnetic angle.
	5829	variation of the pole	A wandering of the POLES of the FIGURE OF THE EARTH with respect to its POLES of ROTATION.
	5830	variometer	An instrument for comparing magnetic forces, especially of the EARTH's MAGNETIC FIELD.
	5831	varsol	An oil used as the liquid in some modern MAGNETIC COMPASSES.
	5832	varve	A sedimentary DEPOSIT, bed, or lamination deposited in one season. It is usually distinguished by colour or composition and used as an inde... more A sedimentary DEPOSIT, bed, or lamination deposited in one season. It is usually distinguished by colour or composition and used as an index to changes in the depositional environment.
	5833	vectograph	A stereoscopic PHOTOGRAPH composed of two superimposed IMAGES which polarize light in planes 90° apart. When these IMAGES are viewed through... more A stereoscopic PHOTOGRAPH composed of two superimposed IMAGES which polarize light in planes 90° apart. When these IMAGES are viewed through polaroid spectacles with the polarization axes at right angles, an impression of depth is obtained.
	5834	vector	Direct connection between two points, either given as two sets of coordinates (points), or by direction and distance from one given set of ... more Direct connection between two points, either given as two sets of coordinates (points), or by direction and distance from one given set of coordinates; or a point in a vector space defined by one set of coordinates relative to the origin of a coordinate system.
	5835	vector airborne magnetometer	See MAGNETOMETER.
	5836	vector data presentation	Method of representing image features digitally by points, lines and polygons given through their coordinates and appropriate code(s).
	5837	vectorial angle	See COORDINATES: PLANE POLAR.
	5838	veering wind	Clock-wise change of WIND direction, in either hemisphere.
	5839	vein	A narrow LEAD or lane in PACK ICE. In mineralogy, a crack or fissure in the ROCKS of the EARTH's CRUST in which highly heated waters from be... more A narrow LEAD or lane in PACK ICE. In mineralogy, a crack or fissure in the ROCKS of the EARTH's CRUST in which highly heated waters from below have deposited from solution crystalline minerals (especially vein quartz) and, under certain circumstances, metallic minerals of economic importance.
	5840	velocimeter	An instrument used for the 'in situ' measurement of the SPEED of SOUND in the SEA and other natural waters.
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