Difference between revisions of "Meteorological range"

From Glossary of Meteorology
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== meteorological range ==
 
== meteorological range ==
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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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<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 the threshold contrast ''&#x003b5;'' is set equal to 0.05. 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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<p>International Civil Aviation Organization, 2005: Manual of Runway Visual Range Observing and Reporting Practices. Accessed 20 May 2021. <nowiki>http://www.icscc.org.cn/upload/file/20190102/Doc.9328-EN%20Manual%20of%20Runway%20Visual%20Range%20Observing%20and%20Reporting%20Practices.pdf</nowiki>.</p><br/>
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<p>''Term edited 20 May 2021.''</p>
  
 
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Latest revision as of 13:05, 20 May 2021



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 the threshold contrast ε is set equal to 0.05. Thus, V′ is a function only of the extinction coefficient σ of the atmosphere at the time and place in question.

International Civil Aviation Organization, 2005: Manual of Runway Visual Range Observing and Reporting Practices. Accessed 20 May 2021. http://www.icscc.org.cn/upload/file/20190102/Doc.9328-EN%20Manual%20of%20Runway%20Visual%20Range%20Observing%20and%20Reporting%20Practices.pdf.


Term edited 20 May 2021.