Visual Range: Difference between revisions
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'''2-1- | '''urn:mrn:iala:dic:2-1-0285''' | ||
1. The maximum distance (usually horizontal) at which a given object can be seen by day in any particular circumstances, as limited by the atmospheric transmission. The distance is such that the contrast of the object with its background is reduced by the atmosphere to the contrast threshold value for the observer (2-1-300). | 1. The maximum distance (usually horizontal) at which a given object can be seen by day in any particular circumstances, as limited by the atmospheric transmission. The distance is such that the contrast of the object with its background is reduced by the atmosphere to the contrast threshold value for the observer (2-1-300). | ||
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[[Category:Alphabetical Index]] | [[Category:Alphabetical Index]] | ||
[[Category:IALA Dictionary 1970-89 Edition]] | [[Category:IALA Dictionary 1970-89 Edition]] | ||
[[Category:IALA Dictionary 2023 Revision]] | |||
Latest revision as of 10:13, 17 September 2026
1. The maximum distance (usually horizontal) at which a given object can be seen by day in any particular circumstances, as limited by the atmospheric transmission. The distance is such that the contrast of the object with its background is reduced by the atmosphere to the contrast threshold value for the observer (2-1-300).
2. Loosely used as a synonym for "visibility" (in sense 2 of 2-1 -275). This use of the term is deprecated.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
