HR: 14:55h
AN: GC53B-06    [Abstracts]
TI: Monitoring the Environment using High-Spatial Resolution Remote Sensing: Contribution to Health Information Systems
AU: * Tourre, Y M
EM: yvestourre@aol.com
AF: MEDIAS-France, CNES, BPi 2102 18 Avenue Edouard Belin, Toulouse, 31401, France
AU: * Tourre, Y M
EM: yvestourre@aol.com
AF: LDEO of Columbia University, Route 9W, Palisades, NY 10964, United States
AU: Lacaux, J
EM: lacaux@medias.cnes.fr
AF: MEDIAS-France, CNES, BPi 2102 18 Avenue Edouard Belin, Toulouse, 31401, France
AB: Presence (density) of mosquitoes linked to Rift Valley Fever (RVF) epidemics in the Ferlo (Senegal) is evaluated by monitoring the environment from space. Using five SPOT-5 high-resolution images (~10m spatial resolution, on August 17th, 2006) a meridional transect of 290 x 60 km2 is analyzed for the first time. Four major ecozones are thus identified: Senegal River valley; sandy Ferlo; sandy-clayey Ferlo; and steppe/cultivated areas, from north to south, respectively. An integrated/multidisciplinary approach using remote-sensing leads to a composited Zones Potentially Occupied by Mosquitoes (or ZPOMs, with extrema). It is found that at the peak of the rainy season, the area occupied by ponds is of 12,817 ha ± 10% (i.e., ~ 0.8 % of the transect) with a mean ZPOM 17 times larger i.e.: 212,813 ha ± 10 % (or ~14 % of the transect). ZPOMs characteristics (minimum and maximum) at the ecozones levels with different hydrological mechanisms, are presented. Ponds and ZPOMs inter-annual variabilities and RVF risks, are subsequently highlighted by comparing statistics in the so-called Barkedji zone (sandy-clayey Ferlo with a hydrofossil riverbed), for the very humid year of 2003, and the near normal rainfall year of 2006. It is shown that at the end of August 2003/2006, ponds (ZPOMs) areas, were already ~22 (~5) times larger. The key roles played by isolated ponds for animals' exposure to RVF risks are thus identified. These results highlight the importance of monitoring the changing environment when linkages with public health exist. The ZPOM approach is to be adapted for other vector-borne diseases such as malaria, dengue fever, in different places of the world. Results are meant to be included into Health Information Systems (HIS) on an operational basis, in order to minimize socio-economical impacts from epidemics.
DE: 1640 Remote sensing (1855)
DE: 1816 Estimation and forecasting
DE: 1855 Remote sensing (1640)
DE: 6309 Decision making under uncertainty
DE: 6600 PUBLIC ISSUES
SC: Global Environmental Change [GC]
MN: 2007 Fall Meeting