Single leaf reflectance (ρ) and transmittance (τ) are important input variables to vegetative canopy reflectance models and need to be estimated simultaneously with field measurements. Our objective was to evaluate a technique for field measurements of ρ and τ that does not require an integrating sphere. Values of near-normal hemispherical ρ and τ of green leaves of common bean, maize, wheat, and senesced leaves of potato measured with an integrating sphere and a high resolution spectroradiometer were compared with estimates of ρ and τ derived from contrasting white and black backgrounds. Values of ρ and τ were determined from a relationship relating ρ and τ to reflectance from contrasting backgrounds using the hemispherical sensor head of the spectroradiometer and with leaves placed on a 0.6 m × 0.6 m white/black panel. Derivation of ρ and τ involved estimating infinite reflectance (R ∞) and then calculating ρ and τ. The technique produced good estimates of ρ and τ compared to the integrating sphere-derived measurements of ρ and τ. Based on these results, it was concluded that the radiometer used to measure canopy reflectance can be used to measure ρ and τ in the field.

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   |wiki=    Wicri/France
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   |étape=   Exploration
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   |clé=     ISTEX:5F401C12A68B5AE18844A4F7FFF1B96F3B6D01AB
   |texte=   A technique for determination of single leaf reflectance and transmittance in field studies
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