Assessing optical earth observation systems for mapping and monitoring temporary ponds in arid areas

Soti Valérie, Tran Annelise, Bailly Jean Stéphane, Puech Christian, Lo Seen Danny, Bégué Agnès. 2009. Assessing optical earth observation systems for mapping and monitoring temporary ponds in arid areas. International Journal of Applied Earth Observation and Geoinformation, 11 (5) : 344-351.

https://doi.org/10.1016/j.jag.2009.05.005

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Résumé : Remote sensing methods for locating and monitoring temporary ponds over large areas in arid lands were tested on a study site in Northern Senegal. Three main results are presented, validated with field data and intended to highlight different spectral, spatial and temporal characteristics of the methods: (1) Among several water indices tested, two Middle Infrared-based indices (MNDWI-Modified Normalized Difference Water Index and NDWI1-Normalized Difference Water Index) are found to be most efficient; (2) an objective method is given prescribing the necessary sensor spatial resolution in terms of minimal detected pond area; and (3) the potential of multi-temporal MODIS imagery for tracking the filling phases of small ponds is illustrated. These results should assist in epidemiological studies of vectorborne diseases that develop around these ponds, but also more generally for land and water management and preservation of threatened ecosystems in arid areas.

Mots-clés Agrovoc : gestion des eaux, étang, zone aride, télédétection, cartographie

Mots-clés géographiques Agrovoc : Sénégal

Classification Agris : U30 - Méthodes de recherche
B10 - Géographie
P10 - Ressources en eau et leur gestion
P01 - Conservation de la nature et ressources foncières

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

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