Investigation of a model inversion technique to estimate canopy biophysical variables from spectral and directional reflectance data Marie Weiss, Frédéric Baret, Ranga B. Myneni, Agnès Pragnère and Youri Knyazikhin Agronomie, 20 1 (2000) 3-22 DOI: 10.1051/agro:2000105