English

In PHOTOGRAM­METRY, a mark seen as occu­pying a position in the three-dimensional space formed by the STEREOSCOPIC FUSION of a pair of PHOTO­GRAPHS and used as a refe­rence mark in examining or measu­ring the STEREOSCOPIC MODEL.

In computer systems the type of numeric data approximately representing real numbers. A floa­ting point number is composed of an exponent and a mantissa specifying the numerical value relative to the exponent. Owing to the limited length of a compu­ter WORD, the floating point representation may cause a loss of precision.

(British terminology). The paper of a FIELD BOARD when detached from the board on completion of the work for which the FIELD BOARD was prepared.

A vertical pipe or box with a relatively small opening in the bottom, used to enclose the float of a tide gauge so the float will be little affected by nontidal motions of the water. Synonymous with stilling well.

A piece of SEA ICE other than FAST ICE. Floes over 10 km across are described as vast; those between 1 and 10 km across as big; those between 200 and 1,000 m across as medium; those between 10 and 200 m across as small. Floes less than 10 m across are called ICE CAKES.

The FLOOD STREAM. Sometimes the term 'flood' is also used with reference to vertical tidal movement. The opposite is EBB. An overflowing of water on LAND usually dry; inund­ati­on.

The horizontal movement of water asso­ciated with the RISING TIDE. Flood streams generally set toward the SHORE, or in the direc­tion of the tide progression. Also called FLOOD,flood currentoringoing stream.

Emission of light or other RADIANT ENERGY as a result of and only during absorption of RADIATION from some other source. See LUMINESCENCE and PHOS­PHORESCENCE.