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Leaf Optical Properties

  • E. A. Walter-Shea
  • J. M. Norman
Chapter

Abstract

Radiant energy intercepted by a vegetative canopy is primarily scattered by leaves either away from the leaf surface or to the leaf interior. The scattered radiation is reflected, transmitted, or absorbed by leaves. Many studies have been performed to develop an understanding of leaf reflectance and transmittance mechanisms. The partitioning of radiation as reflected, transmitted, or absorbed energy depends on a number of factors including leaf cellular structure (Gates et al. 1965; Knipling 1970; Woolley 1971), leaf pubescence and roughness (Gausman 1977), leaf morphology and physiology (Gausman et al. 1969a, b; Gausman and Allen 1973; Gausman et al. 1971a), and leaf surface characteristics (Breece and Holmes 1971; Grant 1985).

Keywords

Relative Water Content Leaf Water Content Bidirectional Reflectance Distribution Function Cotton Leave Bidirectional Reflectance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Symbols

BRDF

bidirectional reflectance distribution function

BDRF

bidirectional reflectance factor

BTDF

bidirectional transmittance distribution function

BDTF

bidirectional transmittance factor

dA

leaf area

dFv

radiant flux from sample surface

dFv,id

ideal radiant flux from ideal (“lossless”) Lambertian standard surface (BRDF)

dΩ̱, d Ω̱′

element of projected solid angles of reflected and incident radiation

fv(θ, φ;θ′,φ′)

bidirectional reflectance distribution function

I(Ω̱′)

incident radiation

mid

IR: middle-infrared radiation (1.35–2.7 um)

NIR

near-infrared radiation (0.7–1.35 um)

RF

reflectance factor

θ

view zenith angle

φ

view azimuth angle

θ′

source incidence zenith angle

φ′

source azimuth angle

ρ(θ′, φ′)

directional-hemispherical reflectance factor with source incidence angle, θ′

τ(θ′, φ′)

directional-hemispherical reflectance factor with source incidence angle, θ′

Ω̱, Ω̱′

solid angles of incident and reflected radiation

μ

cos θ

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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • E. A. Walter-Shea
  • J. M. Norman

There are no affiliations available

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