TerraSAR-X high-resolution radar remote sensing: an operational warning system for Rift Valley fever risk

Vignolles, Cécile and Tourre, Yves M. and Mora, Oscar and Imanache, Laurent and Lafaye, Murielle (2010) TerraSAR-X high-resolution radar remote sensing: an operational warning system for Rift Valley fever risk. Geospatial health , 5 (1). pp. 23-31. ISSN 1970-7096

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Abstract

In the vicinity of the Barkedji village (in the Ferlo region of Senegal), the abundance and aggressiveness of the vector mosquitoes for Rift Valley fever (RVF) are strongly linked to rainfall events and associated ponds dynamics. Initially, these results were obtained from spectral analysis of high-resolution (~10 m) Spot-5 images, but, as a part of the French AdaptFVR project, identification of the free water dynamics within ponds was made with the new high-resolution (down to 3-meter pixels), Synthetic Aperture Radar satellite (TerraSAR-X) produced by Infoterra GmbH, Friedrichshafen/Potsdam, Germany. During summer 2008, within a 30 x 50 km radar image, it was found that identified free water fell well within the footprints of ponds localized by optical data (i.e. Spot-5 images), which increased the confidence in this new and complementary remote sensing technique. Moreover, by using near real-time rainfall data from the Tropical Rainfall Measuring Mission (TRMM), NASA/JAXA joint mission, the filling-up and flushingout rates of the ponds can be accurately determined. The latter allows for a precise, spatio-temporal mapping of the zones potentially occupied by mosquitoes capable of revealing the variability of pond surfaces. The risk for RVF infection of gathered bovines and small ruminants (~1 park/km2) can thus be assessed. This new operational approach (which is independent of weather conditions) is an important development in the mapping of risk components (i.e. hazards plus vulnerability) related to RVF transmission during the summer monsoon, thus contributing to a RVF early warning system.

Item Type:	Article
Uncontrolled Keywords:	Rift Valley fever, mosquitoes, TerraSAR-X, high-resolution remote sensing, early warning systems, Senegal
Subjects:	600 Tecnologia - Scienze applicate > 610 Medicina e salute (Classificare qui la tecnologia dei servizi medici) > 614 Medicina legale; incidenza delle malattie; Medicina preventiva pubblica > 614.4 Incidenza delle malattie e misure pubblica per prevenirle (classificare qui l'Epidemiologia, l'Epidemiologia clinica) > 614.42 Incidenza delle malattie, e misure pubbliche per prevenirle. Incidenza (classificare qui la prevalenza; la Geografia medica; l'Epidemiologia spaziale; i rilevamenti sanitari) 600 Tecnologia - Scienze applicate > 630 Agricoltura e tecnologie connesse > 636 Allevamento di animali > 636.2 Ruminanti, Camelidi, Bovidae, Bovini > 636.20896918 Infezioni da virus a RNA (include la febbre da zecche del Colorado, la febbre della Valle del Rift, le infezioni da Hantavirus) 900 Storia, Geografia e discipline ausiliarie > 910 Geografia e viaggi > 910.285 Geographic information systems
Depositing User:	biblioteca 7
Date Deposited:	05 Apr 2011 13:26
Last Modified:	05 Apr 2011 13:26
URI:	http://eprints.bice.rm.cnr.it/id/eprint/3144

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