Visibility
Meteorological Measurements - Sensors and representativeness

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R3050 V4 Article

 Visibility
Meteorological Measurements - Sensors and representativeness

Author : Michel LEROY

Publication date: December 10, 2025 | Lire en français

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11.  Visibility

11.1  Definitions

The concept of visibility can vary greatly depending on needs, and its perception is highly dependent on the individual's visual acuity. Physically, visibility is linked to the extinction coefficient σ of the atmosphere. This coefficient represents the attenuation of a light beam over a path.  d  :

I=I0 eσd( 2 )
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