Testing the Contribution of WorldView-2 Improved Spectral Resolution for Extracting Vegetation Cover in Urban Environments

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Detailed spatial data concerning land cover constitutes valuable information not only for urban design and planning but also to support informed decisions toward urban sustainable development. Obtaining such information from satellite imagery, with quality compatible with cartographic and thematic standards, is still a challenging task. Until recently, very high-resolution (VHR) satellites acquired data with high spatial resolution (1m or less) but with only four spectral bands, typically in the visible and infrared regions. WorldView-2 (WV-2) offers improved spectral capability by acquiring data in an additional set of spectral bands. Using Lisbon as the case study, this research tests the contribution of the new bands of WV-2 sensor for extracting vegetation information in urban landscapes with different levels of plant heterogeneity. The methodology is based on an automated feature extraction procedure, followed by an object-based accuracy assessment. Results show that including the new WV-2 bands coastal and yellow (bands 1 and 8), along with the standard four-band set, increases the overall accuracy by 1-6%. However, the magnitude of improvement depends on the homogeneity of plants species present in the site. ResumeLes donnees spatiales detaillees concernant la couverture terrestre constituent des renseignements precieux pour la planification et le design urbain, mais aussi pour soutenir des decisions eclairees pour un developpement urbain durable. Obtenir ces informations a partir d'images satellite, avec qualite compatible avec les normes cartographiques et thematiques, est toujours une tache difficile. Jusqu'a tout recemment, les satellites a tres haute resolution (VHR) fournissaient des donnees a haute resolution dans le domaine spatial, mais faible resolution dans le domaine spectral. WorldView-2 (WV-2) offre une meilleure capacite spectrale par l'acquisition de donnees dans un ensemble supplementaire de bandes spectrales. l'aide de Lisbonne comme l'etude de cas, cette recherche teste la contribution de la resolution spectrale accrue du capteur WV-2 d'informations sur la vegetation dans les paysages urbains avec differents niveaux d'heterogeneite des plantes. La methodologie est basee sur une procedure d'extraction automatisee de caracteristiques, suivie d'une evaluation de la precision basee sur les objets. Les resultats montrent qu'y compris les nouvelles bandes de WV-2 cotiers et jaune (bandes 1 et 8), ainsi que de l'ensemble standard de 4 bandes, augmente la precision globale de 1 a 6%. Cependant l'ampleur de l'amelioration depend de l'heterogeneite du site vers la couverture vegetale.

Original languageEnglish
Pages (from-to)505-514
Number of pages10
JournalCanadian Journal of Remote Sensing
Issue number6
Publication statusPublished - 2 Nov 2015




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