Surveillance et cartographie des plans d'eau et des zones humides et inondables en régions arides avec l'instrument VEGETATION embarqué sur SPOT-4
- 1 March 2004
- journal article
- research article
- Published by Taylor & Francis Ltd in International Journal of Remote Sensing
- Vol. 25 (5), 987-1004
- https://doi.org/10.1080/0143116031000139908
Abstract
Résumé. L'observation régulière de l'état des petits plans d'eau et des zones humides est très utile dans les régions arides et semi-arides, car leur existence est entièrement contrôlée par le rythme des pluies. Sur les images en composition colorée des données VEGETATION les plans d'eau et les bas-fonds sont clairement identifiables. Une simple classification de la signature spectrale des zones observées ne suffit pas à les repérer car les conditions écologiques varient énormément de même que le comportement radiométrique. Dans cette étude, une méthode contextuelle basée sur le contraste local a été élaborée et testée. Une validation systématique a été menée et une carte des plans d'eau et des zones humides a été produite pour le Burkina Faso et les régions voisines. Monitoring the state of small waterbodies and wetlands is very useful in dry regions, because their existence is entirely controlled by the rhythm of local rainfall. On VEGETATION image colour composites, waterbodies and marshy vegetation show up clearly. Yet simple image classification does not yield sufficiently good results because ‘spectral signatures' vary significantly together with the ecological conditions of these surfaces. A robust contextual procedure taking into account local contrast was successfully developed and tested. A systematic validation was carried out and a map of waterbodies and wetlands was produced for Burkina Faso and neighbouring regions.Keywords
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