An object-based approach for flood area delineation in a transboundary area using ENVISAT ASAR and LANDSAT TM data

TitleAn object-based approach for flood area delineation in a transboundary area using ENVISAT ASAR and LANDSAT TM data
Publication TypeJournal Article
Year of Publication2011
AuthorsMallinis, G, Ioannis Z. Gitas, Giannakopoulos, V, Maris, F, Tsakiri-Strati, M
JournalInternational Journal of Digital Earth
Pagination1 - 13
Date PublishedApr-12-2012
ISSN1753-8947
Keywordsclassification, digital earth, GEOBIA, natural disaster, Remote sensing
Abstract

The aim of this study was to develop a straightforward approach for flood area mapping in a transboundary riverbed using Geographic Object-Based Image Analysis. Weak bilateral/multilateral cooperation among neighboring countries hampers effective disaster management and mitigation activities over transboundary areas and strengthens the demand for reliable remote-sensing-derived information. Three object-based classification approaches using ENVISAT/ASAR and multi-temporal LANDSAT TM data were developed and validated for flood area delineation. The accuracy assessment of the classification results was based on oblique air photo interpretation and an area-based comparison with the official flood map. The bi-level object-based model using the Normalized Difference Water Index and the original post-flood TM bands attained 92.67% overall accuracy in inundated-areas detection, while the ENVISAT/ASAR classification was the least accurate (85.33%), probably due to the lower spatial resolution of the Synthetic Aperture Radar image. A strong agreement (92.14%) was found between the LANDSAT flood extent and the official flood map, suggesting that the proposed method has the potential to be employed in the future as a standard part of a flood crisis management process.

 

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URLhttp://www.tandfonline.com/doi/abs/10.1080/17538947.2011.641601
DOI10.1080/17538947.2011.641601
Short TitleInternational Journal of Digital Earth