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	Eng ID	Term	Definition
	2401	ice rise	A mass of ICE resting on ROCK and surrounded either by an ICE SHELF or partly by an ICE SHELF and partly by SEA. No ROCK is exposed and the... more A mass of ICE resting on ROCK and surrounded either by an ICE SHELF or partly by an ICE SHELF and partly by SEA. No ROCK is exposed and there may be none above SEA LEVEL. Ice rises often have a dome-shaped surface. The largest known is about 100 km across.
	2402	ice sheet	A continuous mass of ICE and SNOW of considerable thickness and large area. Ice sheets may be resting on ROCK (see INLAND ICE SHEET) or floa... more A continuous mass of ICE and SNOW of considerable thickness and large area. Ice sheets may be resting on ROCK (see INLAND ICE SHEET) or floating (see ICE SHELF). Ice sheets of less than 40,000 sq. km resting on ROCK are called ice caps.
	2403	ice shelf	A floating ICE SHEET of considerable thickness. Ice shelves are usually of great horizontal extent and have a level or gently undulating su... more A floating ICE SHEET of considerable thickness. Ice shelves are usually of great horizontal extent and have a level or gently undulating surface. They are nourished by local snow accumulation and often also by the seaward extension of land glaciers. Limited areas may be aground. The initial stage is called BAY ICE until the surface is more than about 2 m above SEA LEVEL. The seaward edge is termed an ICE FRONT.
	2404	ice storm	Intense formation of ICE on objects by the freezing, on impact, of drops of RAIN or DRIZZLE.
	2405	ice wall	An ice cliff forming the seaward margin of an INLAND ICE SHEET, ICE PIEDMONT or ICE RISE. The rock basement may be at or below SEA LEVEL. Se... more An ice cliff forming the seaward margin of an INLAND ICE SHEET, ICE PIEDMONT or ICE RISE. The rock basement may be at or below SEA LEVEL. See ICE FRONT.
	2406	identification beacon	See BEACON.
	2407	IEC	International Electrotechnical Commission
	2408	igneous rock	ROCK formed by solidification of molten material or MAGMA.
	2409	illuminated contours	An application of ILLUMINATED RELIEF in which CONTOURS appear lighter on illuminated SLOPES and darker on the shadow SLOPES.
	2410	illuminated relief	The representation of RELIEF with the appearance of lighting from one or more directions, giving a three-dimensional impression. Also called... more The representation of RELIEF with the appearance of lighting from one or more directions, giving a three-dimensional impression. Also called shaded relief.
	2411	illumination (at a point of a surface)	Quotient of the LUMINOUS FLUX incident on an infinitesimal element of the surface containing the point under consideration, by the area of... more Quotient of the LUMINOUS FLUX incident on an infinitesimal element of the surface containing the point under consideration, by the area of that element.
	2412	image	The optical counterpart of an object.
	2413	image: erect	An IMAGE that appears upright or in the same relative position as the object.
	2414	image: inverted	An IMAGE that appears upside down in relation to the object.
	2415	image: real	An IMAGE actually produced and capable of being shown on a surface, as in a CAMERA.
	2416	image: virtual	An IMAGE that cannot be shown on a surface but is visible, as in a MIRROR.
	2417	image point	In PHOTOGRAMMETRY, the IMAGE on a PHOTOGRAPH corresponding to a definite object on the GROUND.
	2418	imagery	Techniques to obtain, process or interpret images created by different types of radiation, e.g. light, infrared, x-rays.
	2419	impedance	The total opposition offered to an alternating current. It may consist of any combination of resistance, inductive reactance, or capacitive... more The total opposition offered to an alternating current. It may consist of any combination of resistance, inductive reactance, or capacitive reactance.
	2420	impersonal micrometer	See MICROMETER: TRANSIT.
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