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Extracting quantitative information from remote sensing data requires analytical tools such as canopy reflectance models to interpret radiative measurements in terms of agronomical or ecological biophysical properties such as leaf chlorophyll and water content, or canopy architecture. In the optical spectral region, plant leaves may be considered basic scattering elements. Light attenuation inside leaves results from complex phenomena related to biochemical composition and anatomical features, while the epidermis determines the bidirectional reflectance. A new model of leaf optical properties has been developed, where the internal three-dimensional cellular structure is explicitly described to represent morphological properties of major species. Radiative transfer in this virtual three-dimensional leaf is then computed with a Monte Carlo ray tracing code based on the latest computer graphics techniques. These ray paths are used to compute the bi-directional reflectance and transmittance, but also the light extinction profile by the various leaf tissues. The main objective of this work is to perform sensitivity analyses at different wavelengths to test the influence of the leaf internal structure as well as that of pigment and water concentrations on the light attenuation profile and the bidirectional scattering shape.

Additional information

Authors: GOVAERTS Y M, JRC Ispra (IT);VERSTRAETE M M, JRC Ispra (IT);JACQUEMOUD S, University of California, Department of Land, Air and Water Resources, Davis (US);USTIN S L, University of California, Department of Land, Air and Water Resources, Davis (US)
Bibliographic Reference: Paper presented: IGARSS '95, Firenze (IT), July 10-14, 1995
Availability: Available from (1) as Paper EN 38992 ORA
Record Number: 199510725 / Last updated on: 1995-07-07
Original language: en
Available languages: en
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