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	Eng ID	Term	Definition
	1301	delineation	In CARTOGRAPHY, the visual selection and distinguishing of mapworthy features on various possible source materials by outlining the features... more In CARTOGRAPHY, the visual selection and distinguishing of mapworthy features on various possible source materials by outlining the features on the source material, or on a map manuscript (as when operating a STEREOSCOPIC PLOTTING INSTRUMENT); also a preliminary step in COMPILATION.
	1302	delta	An area of alluvial DEPOSIT, usually triangular in outline, near the MOUTH of a RIVER.
	1303	demagnetize	(v.t.). To remove MAGNETISM. The opposite is MAGNETIZE.
	1304	densitometer	An electric instrument designed to accurately measure optical DENSITY or tone values and used in place of the human eye for such purposes.
	1305	density	In PHOTOGRAPHY, a measure of the degree of blackening of an exposed film, PLATE or paper after development, or the direct IMAGE (in the case... more In PHOTOGRAPHY, a measure of the degree of blackening of an exposed film, PLATE or paper after development, or the direct IMAGE (in the case of a print-out material). It is defined strictly as the logarithm of the optical OPACITY. In OCEANOGRAPHY, density is equivalent to SPECIFIC GRAVITY and represents the ratio, at ATMOSPHERIC PRESSURE, of the WEIGHT of a given volume of SEA WATER to that of an equal volume of distilled water at 4.0°C.
	1306	density layer	A LAYER of water in which DENSITY increases with DEPTH enough to increase the BUOYANCY of a submarine.
	1307	density of soundings	Intervals between LINES OF SOUNDING and SOUNDINGS in the same line. Density of soundings mostly depends on the SCALE and nature of the SURVE... more Intervals between LINES OF SOUNDING and SOUNDINGS in the same line. Density of soundings mostly depends on the SCALE and nature of the SURVEY. Also called frequency of soundings.
	1308	departure	The distance between two MERIDIANS at any given PARALLEL OF LATITUDE expressed in linear units, usually NAUTICAL MILES. The distance to the ... more The distance between two MERIDIANS at any given PARALLEL OF LATITUDE expressed in linear units, usually NAUTICAL MILES. The distance to the east or west made good by a vessel in proceeding from one point to another.
	1309	departure: point of	The point from which the initial COURSE to reach the point of destination begins.
	1310	deposit	Accumulations of solid material (of any type or from any source) on the sea bottom which eventually may become compacted and consolidated an... more Accumulations of solid material (of any type or from any source) on the sea bottom which eventually may become compacted and consolidated and form sedimentary ROCK.
	1311	depressed pole	See POLE.
	1312	depressor	A device to maintain a towfish at a given depth.
	1313	depression	Any HOLLOW or relatively sunken area. In METEOROLOGY, a region of the ATMOSPHERE in which the pressure is low relative to the surrounding re... more Any HOLLOW or relatively sunken area. In METEOROLOGY, a region of the ATMOSPHERE in which the pressure is low relative to the surrounding region at the same level. It is represented on a WEATHER CHART by a system of ISOBARS at a specified level or of CONTOURS at a specified pressure which enclose relatively low values of pressure or level. Also calledlowor cyclone.
	1314	depression: angle of	See ANGLE OF DEPRESSION.
	1315	depression contour	See CONTOUR.
	1316	depression of the horizon	See DIP.
	1317	depth	The vertical distance from a given water level to the BOTTOM.
	1318	depth: charted	The vertical distance from the CHART DATUM to the BOTTOM.
	1319	depth: compensation	The DEPTH at which the light intensity is just sufficient to bring about a balance between the oxygen produced by ALGAE through PHOTOSYNTHES... more The DEPTH at which the light intensity is just sufficient to bring about a balance between the oxygen produced by ALGAE through PHOTOSYNTHESIS and that consumed by them through respiration.
	1320	depth: controlling	The least DEPTH in the approach or CHANNEL to an area, such as a PORT or ANCHORAGE, governing the maximum DRAFT of vessels that can enter.
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