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	Eng ID	Term	Definition
	3621	orientation: basal	In PHOTOGRAMMETRY, the establishment of the POSITION of both ends of an AIR BASE with respect to a ground system of COORDINATES. In all,... more In PHOTOGRAMMETRY, the establishment of the POSITION of both ends of an AIR BASE with respect to a ground system of COORDINATES. In all, six elements are required. These are essentially the three-dimensional COORDINATES of each end of the BASE.
	3622	orientation: exterior	In PHOTOGRAMMETRY, the determining (analytically or in a photogrammetric instrument) of the POSITION of the CAMERA STATION and the attitude ... more In PHOTOGRAMMETRY, the determining (analytically or in a photogrammetric instrument) of the POSITION of the CAMERA STATION and the attitude of the taking CAMERA at the instant of EXPOSURE. In stereoscopic instrument practice, exterior orientation is divided into two parts, RELATIVE and ABSOLUTE ORIENTATION. Also called outer orientation.
	3623	orientation: inner	See ORIENTATION: INTERIOR.
	3624	orientation: interior	In PHOTOGRAMMETRY, the determining (analytically or in a photogrammetric instrument) of the interior perspective of the PHOTOGRAPH as it was... more In PHOTOGRAMMETRY, the determining (analytically or in a photogrammetric instrument) of the interior perspective of the PHOTOGRAPH as it was at the instant of EXPOSURE. Elements of interior orientation are the CALIBRATED FOCAL LENGTH, location of the calibrated PRINCIPAL POINT, and the calibrated LENS DISTORTION. Also called inner orientation.
	3625	orientation: outer	See ORIENTATION: EXTERIOR.
	3626	orientation: photogrammetric	The recreation of natural terrain features at a miniature SCALE by the optical projection of overlapping PHOTOGRAPHS. The model is formed wh... more The recreation of natural terrain features at a miniature SCALE by the optical projection of overlapping PHOTOGRAPHS. The model is formed when all corresponding LIGHT RAYS from the two PROJECTORS intersect in space. See also ORIENTATION: ABSOLUTE, ORIENTATION: BASAL, ORIENTATION: EXTERIOR, ORIENTATION: INTERIOR.
	3627	orientation: relative	In PHOTOGRAMMETRY, the determining (analytically or in a photogrammetric instrument) of the POSITION and attitude of one of a pair of over... more In PHOTOGRAMMETRY, the determining (analytically or in a photogrammetric instrument) of the POSITION and attitude of one of a pair of overlapping PHOTOGRAPHS with respect to the other PHOTOGRAPH.
	3628	orientation of plane table	Placing the PLANE TABLE in such a position that every line drawn on the SURVEY SHEET from the point which represents the POSITION of the tab... more Placing the PLANE TABLE in such a position that every line drawn on the SURVEY SHEET from the point which represents the POSITION of the table on the ground to any other point on the sheet, is parallel to the corresponding line in nature.
	3629	orientation of surveying instrument	Placing the instrument in such position that the HORIZONTAL CIRCLE reads 0° when the LINE OF COLLIMATION is parallel to the direction it ... more Placing the instrument in such position that the HORIZONTAL CIRCLE reads 0° when the LINE OF COLLIMATION is parallel to the direction it had at an earlier (initial) position of the instrument, or to a standard line of reference. If the line of reference is a MERIDIAN, the CIRCLE will show AZIMUTHS referred to that MERIDIAN.
	3630	origin	In SURVEYING, the reference position from which angles or distances are reckoned. See also COORDINATES: ORIGIN OF.
	3631	origin: false	See COORDINATES: FALSE.
	3632	original	See REPRODUCTION.
	3633	original chart	See CHART.
	3634	origin of coordinates	See COORDINATES: ORIGIN OF.
	3635	orography	The branch of physical geography which deals with the formation and features of MOUNTAINS; the description of MOUNTAINS.
	3636	oropesa sweep	Towed wire used for sweeping sea bottom when surveying SHOALS or WRECKS. It consists of a wire running from the stern of the vessel and held... more Towed wire used for sweeping sea bottom when surveying SHOALS or WRECKS. It consists of a wire running from the stern of the vessel and held out on the water by an OTTER which also pulls down against a towed FLOAT. The amount of wire between FLOAT and OTTER determines the DEPTH of the outer end of the sweep. The inner end of the sweep is held to the required DEPTH and in line with the stern of the vessel by a KITE.
	3637	orthochromatic	(adj.). Said of photographic surfaces sensitive to ultra-violet, blue, yellow, green and orange RAYS. Insensitive to red RAYS.
	3638	orthodrome	Any line on a CHART representing a GREAT CIRCLE TRACK between two points.
	3639	orthogonal	(adj.). At right angles; rectangularly meeting, crossing, or lying at right angles.
	3640	orthographic projection	See PROJECTION.
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