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	Eng ID	Term	Definition
	1801	field examination	A special purpose hydrographic, wire drag, or side scan sonar survey of very limited area; i.e., usually an investigation of one or more ind... more A special purpose hydrographic, wire drag, or side scan sonar survey of very limited area; i.e., usually an investigation of one or more individual and scattered items.
	1802	field inspection	In PHOTOGRAMMETRY, the process of comparing AERIAL PHOTOGRAPHS with conditions as they exist on the GROUND, and of obtaining information to... more In PHOTOGRAMMETRY, the process of comparing AERIAL PHOTOGRAPHS with conditions as they exist on the GROUND, and of obtaining information to supplement or clarify that not readily discernible on the PHOTOGRAPHS themselves.
	1803	field position	See POSITION.
	1804	field sheet	The hydrographer's or topographer's work sheet; it presents a graphic display of all surface and subsurface features in the area being surve... more The hydrographer's or topographer's work sheet; it presents a graphic display of all surface and subsurface features in the area being surveyed. See also BOAT SHEET.
	1805	field stop	The physical element (such as an APERTURE STOP, DIAPHRAGM or lens periphery) of an OPTICAL SYSTEM which limits the field of view covered by ... more The physical element (such as an APERTURE STOP, DIAPHRAGM or lens periphery) of an OPTICAL SYSTEM which limits the field of view covered by the system.
	1806	field work	All activities in the field required for a hydrographic survey.
	1807	figure of the earth	The defining elements of the mathematical surface which approximates the surface of the GEOID. The figure of the earth has been proved to be... more The defining elements of the mathematical surface which approximates the surface of the GEOID. The figure of the earth has been proved to be approximately an OBLATE SPHEROID. See also GEOID and SPHEROID.
	1808	file	An entity of data for a specific task or purpose stored on a mass storage device.
	1809	filter	In optics, any transparent material which, by absorption, selectively modifies the light transmitted through an OPTICAL SYSTEM. In ocean-wa... more In optics, any transparent material which, by absorption, selectively modifies the light transmitted through an OPTICAL SYSTEM. In ocean-wave forecasting, a set of formulas that define the particular wave frequencies and directions in the fetch area which are of significance at the point of forecast.
	1810	filtering	The process of selecting specific data from a specific source in accordance with certain rules, formulae, or algorithms.
	1811	final great circle course	See COURSE: GREAT CIRCLE.
	1812	fiord (or fjord)	A long narrow ARM OF THE SEA, running up between high BANKS or CLIFFS, as on the COAST of Norway. Often has a relatively shallow SILL acro... more A long narrow ARM OF THE SEA, running up between high BANKS or CLIFFS, as on the COAST of Norway. Often has a relatively shallow SILL across its ENTRANCE.
	1813	firn	Old SNOW which has become granular and dense under the action of various processes of melting and refreezing, also including sublimation.
	1814	first nodal point	See NODAL POINT.
	1815	first order triangulation	See TRIANGULATION CLASSIFICATION.
	1816	first point of Aries	See EQUINOX.
	1817	first point of Cancer	See SOLSTICE.
	1818	first point of Capricorn	See SOLSTICE.
	1819	first point of Libra	See EQUINOX.
	1820	first quarter	See PHASES OF THE MOON.
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