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Suivi des changements d'occupation et d'utilisation des sols d'origine anthropique et climatique à l'échelle régionale par télédétection moyenne résolution (application à la Bretagne)

Rémi Lecerf 1
1 LETG - Rennes - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
Abstract : Remote sensing data available so far were not relevant for the monitoring of land cover and land use changes on a regional scale in areas with a highly fragmented landscape, because of their temporal resolution and their spatial coverage that are too limited. The objectives of this thesis were on the one hand evaluate time series of remote sensing images with a medium spatial resolution for this type of monitoring, and on the other hand to identify and characterize land use changes in intensive farming regions through two indicators, that are the density of vegetation cover in winter and the ratio cereals / grasslands. For this, time series of MODIS images were used on the Brittany region between 2000 and 2008. A complete chain of processing operations was implemented. It includes methods already used on remote sensing images, but that had to be adapted to the MODIS time series, and original methods, including reconstruction of time series. The results show trends as the decrease of grassland at the expense of cereals or the increase of intercropping systems. They also highlight isolated changes as the increase in wheat in 2006 and 2008 and in corn in 2001. The main drivers of land use changes, which are special climatic conditions or changes in agricultural practices depending on the political or socio-economic context, have been identified. The major interest of MODIS images is to identify "hot spots" on a regional scale, i.e. areas that pose a risk to the environment, such as areas without vegetation cover during several years, and during a long period of the year
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https://tel.archives-ouvertes.fr/tel-00337099
Contributor : Laurence Leroux <>
Submitted on : Thursday, November 6, 2008 - 9:45:47 AM
Last modification on : Wednesday, October 14, 2020 - 4:09:34 AM
Long-term archiving on: : Monday, June 7, 2010 - 10:46:40 PM

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  • HAL Id : tel-00337099, version 1

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Rémi Lecerf. Suivi des changements d'occupation et d'utilisation des sols d'origine anthropique et climatique à l'échelle régionale par télédétection moyenne résolution (application à la Bretagne). Sciences de la Terre. Université Rennes 2, 2008. Français. ⟨tel-00337099⟩

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