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Understanding Visibility: Factors Affecting Scenic Landscapes

This article explores the concept of visibility from a scenic landscape perspective, discussing factors such as atmospheric conditions, aerosols, and the nature of light. It also examines the relationship between aerosols and optical properties that impact visibility. Learn more about how these factors affect the visibility of scenic landscapes.

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Understanding Visibility: Factors Affecting Scenic Landscapes

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  1. 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)

  2. 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.

  3. How far can you see?

  4. Great Smoky MountainsNational Park

  5. Yosemite National Park

  6. Glacier National Park

  7. Canyonlands National Park

  8. Big Bend National Park

  9. Layered Hazes

  10. Layered Hazes

  11. The Seeing of a Landscape Feature

  12. Relationship Between Aerosols and Optical Properties

  13. Extinction = 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.

  14. Scattering Efficiency (Q)

  15. Single Particle Efficiency

  16. Particle Size Distribution

  17. Scattering Efficiency as Function of Size

  18. Carbon Extinction Efficiency

  19. Phase Function for Soil and Sulfate

  20. Phase Function for Carbon

  21. Forward and Backward Scattering

  22. On the Nature of Light • Wave-like characteristics of light • Electromagnetic radiation • Photons and color • Why objects are colored • Atmospheric optical effects

  23. IntroVis.exe

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