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	Eng ID	Term	Definition
	3361	mouse	In computer systems, a pointing device operated by moving on a flat surface. See also CURSOR, JOYSTICK.
	3362	mouth	The place of discharge of a STREAM into the OCEAN or ENTRANCE to a BAY from the OCEAN.
	3363	mud	Pelagic or terrigenous detrital material consisting mostly of silt and clay-sized particles (less than 0.06 millimetre) but often containin... more Pelagic or terrigenous detrital material consisting mostly of silt and clay-sized particles (less than 0.06 millimetre) but often containing varying amount of SAND and/or organic materials. It is a general term applied to any sticky fine-grained SEDIMENT whose exact size classification has not been determined.
	3364	mud: red	A reddish-brown terrigenous deep-sea MUD which accumulates on the SEAFLOOR in the neighbourhood of deserts and off the MOUTHS of great RIV... more A reddish-brown terrigenous deep-sea MUD which accumulates on the SEAFLOOR in the neighbourhood of deserts and off the MOUTHS of great RIVERS; contains calcium carbonate up to 25 per cent.
	3365	mud snapper	See SNAPPER.
	3366	multi-beam echo sounder	A type of SWATH(E) SOUNDING SYSTEM in which the equipment emits a timed PULSE of sound that is narrow in the fore-aft direction and wide in... more A type of SWATH(E) SOUNDING SYSTEM in which the equipment emits a timed PULSE of sound that is narrow in the fore-aft direction and wide in the across track direction. The reflected sound is received by several RECEIVERs arranged as an ARRAY. By use of SIGNAL processing of the SIGNAL received at combinations of the RECEIVERS a much larger number, potentially many hundreds, of ACOUSTIC receive BEAM angles are formed. For each receive BEAM the time interval between emission and reception of the reflected sound is converted into a RANGE. Geometry is then used to convert each RANGE and receive BEAM angle to DEPTHs and also to position these DEPTHs within the SWATH(E) on the SEAFLOOR. MBES systems may also be referred to as beam-formers.
	3367	multiple echo(es)	See ECHO.
	3368	multiple lens camera	See CAMERA.
	3369	multiple lens photograph	See PHOTOGRAPH.
	3370	multiple sea sampler	An instrument which comprises six WATER BOTTLES arranged so that they trip and take WATER SAMPLES at different selected DEPTHS from a vessel... more An instrument which comprises six WATER BOTTLES arranged so that they trip and take WATER SAMPLES at different selected DEPTHS from a vessel under way.
	3371	multiple tide staff	See TIDE STAFF.
	3372	multiplex	In PHOTOGRAMMETRY, an instrument for making a TOPOGRAPHIC MAP from AERIAL PHOTOGRAPHS. A three-dimensional optical model of the TERRAIN to... more In PHOTOGRAMMETRY, an instrument for making a TOPOGRAPHIC MAP from AERIAL PHOTOGRAPHS. A three-dimensional optical model of the TERRAIN to be mapped is produced, in miniature, by direct optical PROJECTION from a pair of overlapping PHOTOGRAPHS. This instrument uses the ANAGLYPH principle.
	3373	multispectral imagery	Images obtained simultaneously in a number of discrete bands in the electromagnetic spectrum.
	3374	multispectral scanner	A remote-sensing device which is capable of recording data in the ultraviolet and visible portions of the electromagnetic spectrum, as well... more A remote-sensing device which is capable of recording data in the ultraviolet and visible portions of the electromagnetic spectrum, as well as the infrared.
	3375	nadir	That point on the CELESTIAL SPHERE directly beneath the observer, and directly opposite to the ZENITH.
	3376	nadir: ground	The point on the GROUND vertically beneath the PERSPECTIVE CENTRE of the camera lens.
	3377	nadir: map	The map position for the GROUND NADIR.
	3378	nadir: photograph	In PHOTOGRAMMETRY, the point at which a vertical line through the PERSPECTIVE CENTRE of the camera lens pierces the plane of the PHOTOGRAPH.... more In PHOTOGRAMMETRY, the point at which a vertical line through the PERSPECTIVE CENTRE of the camera lens pierces the plane of the PHOTOGRAPH. Also called nadir point,or plumb point.
	3379	nadir point	See NADIR: PHOTOGRAPH.
	3380	nadir radial	See RADIAL.
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