Apport Et Analyse d'Images Satellites Pour Le Suivi de la Végétation
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L'objet de ce travail est l'estimation de la couverture végétale à partir d'images satellites hautes résolutions en optique. Pour cela, nous proposons tout d'abord de modéliser le transfert radiatif dans le couvert. Le modèle proposé consiste à coupler les modèles SAIL et Adding permettant ainsi une modélisation fiable de la diffusion et de tenir compte du phénomène de hot spot entre les flux diffus. Ensuite, nous définissons le modèle inverse qui permet d'estimer le taux de couverture à partir des mesures en Rouge et en Proche Infrarouge. Pour cela, nous proposons une inversion semi-empirique du modèle couplé SAIL/Adding consistant à étalonner quatre paramètres. Par la suite, dans le but d'améliorer les résultats, nous proposons de fusionner notre méthode avec des indices de végétation. Nous avons alors proposé une règle de combinaison qui tient compte de la redondance entre les différents estimateurs. La dernière partie est consacrée à la création d'une cartographie du taux de couverture. Nous nous plaçons ainsi dans le cadre de la classification Markovienne. Afin de conserver les structures fines de l'image, nous proposons de considérer un voisinage adaptatif pour chaque pixel.
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