Visibility
urn:aero:airm:1.0.0:ContextualModel:ATMBusinessTerms:Visibility
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.
Source:
ICAO
Abbreviations:
V; VIS