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Evaluation of the runoff potential in high relief semi-arid regions using remote sensing data: application to Bolivia

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The objective of this study is to develop a methodology based on the combined use of optical and radar images for evaluating the runoff potential in high relief, semi-arid environments. We present a method based on the use of multisource satellite images (RADARSAT-1 SAR, Landsat-7 ETM+ and SPOT-4 HRV) for determining land use and the vegetation cover ratio in order to evaluate the runoff potential in Bolivia. Various band combinations provide classification rates greater than 80% for the mapping of land use. Basically, in over 83% of the watershed, the runoff potential is greater than 0.5 on a scale from 0 to 1.

Résumé.La contribution fondamentale de l'étude est le développement d'une méthodologie permettant l'utilisation conjointe d'images optique et radar dans l'évaluation du potentiel de ruissellement en milieu semi-aride de forte énergie de relief. Nous avons conçu une méthode d'exploitation d'images satellitaires multisources (RSO de RADARSAT-1, ETM+ de Landsat-7 et HRV de SPOT-4) afin d'évaluer le potentiel de ruissellement en Bolivie. Plusieurs combinaisons de bandes donnent des taux de classification supérieurs à 80% pour la cartographie de l'occupation du sol. Sur 83% du bassin, le potentiel de ruissellement est supérieur à 0.5 sur un maximum de 1.

Document Type: Research Article


Affiliations: 1: Natural Resources of Canada Earth Sciences Sector 601 Booth Street, Room 396 Ottawa ON Canada K1A 0E8, Email: 2: Centre d'applications et de recherches en télédétection (CARTEL) Université de Sherbrooke Sherbrooke Canada J1K 2R1

Publication date: January 1, 2004

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