visibility

visibility; V; VIS
Visibility for aeronautical purposes is the greater of:
a) the greatest distance at which a black object of suitable dimensions, situated near the ground, can be seen and recognized when observed against a bright background;
b) the greatest distance at which lights in the vicinity of 1 000 candelas can be seen and identified against an unlit background.
Note 1.— The two distances have different values in air of a given extinction coefficient, and the latter b) varies with the background illumination. The former a) is represented by the meteorological optical range (MOR).
Note 2. — The definition applies to the observations of visibility in local routine and special reports, to the observations of prevailing and minimum visibility reported in METAR and SPECI and to the observations of ground visibility
(AN 2; AN 3; PANS-ATM)
Official definition modified by Amdt 36 (01/11/2001), Amdt 38 (24/11/2005) to An 2, by Amdt 3 to PANS-ATM (28/05/2004).
Note 2 to the above official definition appears only in Annex 2 and PANS-ATM.
видимость; V; VIS
Видимость для авиационных целей представляет собой величину, превышающую:
a) наибольшее расстояние, на котором можно различить и опознать чёрный объект приемлемых размеров, расположенный вблизи земли, при его наблюдении на светлом фоне;
b) наибольшее расстояние, на котором можно различить и опознать огни силой света примерно в 1000 кд на неосвещённом фоне.
Примечание 1. Эти два расстояния имеют различные значения в воздухе с заданным коэффициентом поглощения, причём последнее b) зависит от освещённости фона. Первое а) характеризуется метеорологической оптической дальностью видимости (MOR).
Примечание 2. Данное определение применяется к наблюдениям за видимостью, указываемой в местных регулярных и специальных сводках, наблюдениям за преобладающей и минимальной видимостью, указываемой в сводках METAR и SPECI, и к наблюдениям за приземной видимостью.

International Civil Aviation Vocabulary (English-Russian). 2014.

Смотреть что такое "visibility" в других словарях:

  • visibility — vis‧i‧bil‧i‧ty [ˌvɪzˈbɪlti] noun [uncountable] the situation in which people notice a particular company, employee etc: • A company can gain visibility by fostering boldness, risk taking, and growth. • In the past it was more difficult for… …   Financial and business terms

  • visibility — [viz΄ə bil′ə tē] n. pl. visibilities [LL visibilitas] 1. the fact or condition of being visible 2. a) the relative possibility of being seen under the conditions of distance, light, and atmosphere prevailing at a particular time [the poor… …   English World dictionary

  • Visibility — Vis i*bil i*ty, n. [L. visibilitas: cf. F. visibilit[ e].] The quality or state of being visible. [1913 Webster] …   The Collaborative International Dictionary of English

  • visibility — c.1400, condition of being visible, from L.L. visibilitas (see VISIBLE (Cf. visible)). Meaning range of vision under given conditions is from 1914. Sense of prominence, fame, public attention is recorded from 1958 …   Etymology dictionary

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  • Visibility — (Roget s Thesaurus) < N PARAG:Visibility >N GRP: N 1 Sgm: N 1 visibility visibility perceptibility Sgm: N 1 conspicuousness conspicuousness distinctness &c. >Adj. Sgm: N 1 conspicuity conspicuity conspicuousness Sgm: N 1 appearance ap …   English dictionary for students

  • visibility — vis|i|bil|i|ty [ˌvızıˈbılıti] n [U] 1.) the distance it is possible to see, especially when this is affected by weather conditions ▪ Visibility on the roads is down to 20 metres due to heavy fog. good/poor visibility ▪ The search for survivors… …   Dictionary of contemporary English

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