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- W2002169344 abstract "Un catalogue de donnees de reflectance bidirectionnelle (BRDF), acquis avec le capteur aeroporte POLDER, correspondant a plusieurs types de cultures (principalement du ble, de la luzerne, du tournesol et du mais) a ete acquis lors de la campagne Alpilles/ReSeDA, tout au long des cycles de cultures en 1997. Le but de cette etude est de tester l'aptitude des reseaux de neurones a estimer des variables biophysiques des couverts vegetaux a partir de donnees de teledetection. Les variables biophysiques considerees sont la fraction de couverture du sol et l'indice foliaire. Deux jeux de donnees ont ete simules a l'aide d'un modele de transfert radiatif dans le couvert (SAIL) : (1) un jeu d'apprentissage permettant d'entrainer les reseaux de neurones, (2) un jeu de validation. Les reseaux de neurones ainsi calibres sont appliques aux donnees ReSeDA-POLDER pour estimer les variables biophysiques. Ces estimations sont ensuite comparees a des mesures in situ pour les 16 dates d'acquisition de la campagne, les differentes parcelles et les differentes cultures. Les performances des reseaux de neurones sont egalement comparees a celles d'une methode classique, basee sur le NDVI." @default.
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- W2002169344 date "2002-09-01" @default.
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- W2002169344 title "Validation of neural net techniques to estimate canopy biophysical variables from remote sensing data" @default.
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