Difference between revisions of "Meteorological range"

From Glossary of Meteorology
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<div class="definition"><div class="short_definition">(''Also called'' standard visibility, standard visual range.) An empirically consistent  measure of the [[visual range]] of a [[target]]; a concept developed to eliminate from consideration  the [[threshold contrast]] and [[adaptation luminance]], both of which vary from [[observer]] to observer.</div><br/> <div class="paragraph">The meteorological range is the distance ''V''&prime; in the black target form of the [[visual-range formula]],  <div class="display-formula"><blockquote>[[File:ams2001glos-Me10.gif|link=|center|ams2001glos-Me10]]</blockquote></div> when &#x003b5;, the threshold contrast, is set equal to 0.02. Thus, ''V''&prime; is a function only of the [[extinction  coefficient]] &#x003c3; of the [[atmosphere]] at the time and place in question.</div><br/> </div>
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<div class="definition"><div class="short_definition">(''Also called'' standard visibility, standard visual range.) An empirically consistent  measure of the [[visual range]] of a [[target]]; a concept developed to eliminate from consideration  the [[threshold contrast]] and [[adaptation luminance]], both of which vary from [[observer]] to observer.</div><br/> <div class="paragraph">The meteorological range is the distance ''V''&prime; in the black target form of the [[visual-range formula]],  <div class="display-formula"><blockquote>[[File:ams2001glos-Me10.gif|link=|center|ams2001glos-Me10]]</blockquote></div> when &#x003b5;, the threshold contrast, is set equal to 0.02. Thus, ''V''&prime; is a function only of the [[extinction coefficient|extinction  coefficient]] &#x003c3; of the [[atmosphere]] at the time and place in question.</div><br/> </div>
 
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Revision as of 17:25, 25 April 2012



meteorological range

(Also called standard visibility, standard visual range.) An empirically consistent measure of the visual range of a target; a concept developed to eliminate from consideration the threshold contrast and adaptation luminance, both of which vary from observer to observer.

The meteorological range is the distance V′ in the black target form of the visual-range formula,
ams2001glos-Me10
when ε, the threshold contrast, is set equal to 0.02. Thus, V′ is a function only of the extinction coefficient σ of the atmosphere at the time and place in question.