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[email protected] David J. Nowak Northern Research Station USDA Forest Service SUNY-ESF 5 Moon Library 1 Forestry Drive Syracuse, NY 13210, U.S.
[email protected] Eric J. Greenfield Northern Research Station USDA Forest Service SUNY-ESF 5 Moon Library 1 Forestry Drive Syracuse, NY 13210, U.S. Résumé. Avec la disponibilité de plusieurs ressources d’imagerie et de diverses techniques de classification digitale, l’évaluation du couvert de la forêt urbaine est facilement disponible pour la plupart des gestion- naires en foresterie urbaine. La compréhension de la capacité et des limites des divers types d’imagerie et de méthodes de classification est essentielle pour interpréter les valeur de couvert végétal. Une revue de plusieurs techniques de détection utilisées pour évaluer le couvert for- estier urbain est présentée. Une étude de cas comparant les pourcentages de couvert avec la ville de Syracuse dans l’état de New York présente l’interprétation des multiples valeurs développées à partir de différentes méthodes. La plupart des méthodes produisent des résultats relativement similaires, mais l’estimé basé sur la banque de données nationales du couvert végétal est plus faible. Zusammenfassung. Mit der Verfügbarkeit vieler Quellen zur Bildaufnahme und digitaler Klassifizierungstechniken ist die Untersu- chung von Stadtwäldern und ihrer Kronenbedeckung für viele Forstleute einfach zugänglich geworden. Ein Verständnis für die Möglichkeiten und Einschränkungen verschiedener Methoden der Bildaufnahme und digitaler Klassifizierungstechniken ist allerdings erforderlich, um die erhaltenen Werte zu interpretieren. Hier wird ein Überblick über ver- schiedene Aufnahmetechniken zur Bewertung der Kronenbedeckung dargestellt. In einer Fallstudie zum Vergleich von Kronenbedeckungen ©2008 International Society of Arboriculture
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