References: Acidic Deposition:State of Science and Technology (report 24) 1990 Visibility: Existing...
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References: References:
• http://vista.cira.colostate.edu/improve/
• Acidic Deposition:State of Science and Technology (report 24) 1990 Visibility: Existing and Historical Conditions – Causes and Effects• Introduction to Visibility (WC Malm) issn 0737-5352-40 (CIRA-CSU)
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What is Visibility?
Historically visibility was thought of in terms of the furthest distance one could see a large black object.
From a scenic vista perspective, there’s more interest in color, line, texture, and form of a scenic landscape feature.
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How far can you see?
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Great Smoky MountainsNational Park
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Yosemite National Park
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Glacier National Park
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Canyonlands National Park
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Big Bend National Park
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Layered Hazes
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Layered Hazes
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The Seeing of a Landscape Feature
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Relationship Between Aerosols and Optical Properties
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The extinction coefficient is made up of
particle and gas scattering and absorption:
where s, a, g, and p refer to scattering, absorption, gases, and particles, respectively.
ext sg ag sp apb = b +b +b +b
Extinction =
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Scattering Efficiency (Q)
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Single Particle Efficiency
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Particle Size Distribution
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Scattering Efficiency as Function of Size
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Carbon Extinction Efficiency
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Phase Function for Soil and Sulfate
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Phase Function for Carbon
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Forward and Backward Scattering
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On the Nature of Light
Wave-like characteristics of light Electromagnetic radiation Photons and color Why objects are colored Atmospheric optical effects
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IntroVis.exe