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• W104093835 abstract "Ecosystems in semi-arid regions appear to be undergoing degradation processes commonly described as desertification. Desertification has been widely recognized as one of the most serious environmental problems in world, although its concept and causes are still debated in scientific communities. The semi-arid region in North Africa is ideal for investigating the processes and mechanisms of desertification due to its very sensitive ecosystem. The desertification constitutes one of the major con-cerns of the countries of the Sahel and North Africa. This phenomenon is responsible for the degradation of natural habitat and for arable land disappearance. Using the Sandy land of Choott El-Garssa, a former dormant dunes and wetlands environment, we monitored the variation of the desertified land and the wetlands in order to assess the climatic and human impacts on the processes of desertification. The research methods included digital image processing of high resolution of satellite data and field verification. Remote sensing data shows that the wetlands were larger in Oudia area. The variation of the extension of mobile dunes is in inverse proportion to that of wetlands. The main process of desertification is the reactivation of dormant sand dunes. The changes of wetlands and desertified lands correlate considerably well with the variations of local precipitation and temperature, suggesting that climate might be the key factor triggering desertification in the Oudia area. In other sandy lands of Oudia area, however, human activities might be the key factor causing desertification and land degradation. With the development of remote sensing tech-niques, it became possible to study this phenomenon through several scales and to analyze the interaction between the various elements of the environment in relation with the dynamics of soil and the human activity. This study was an attempt to use high-resolution satellite data Quick Bird for mapping desertification in the zone of Tozeur. The example selected for this paper is the sector of Oudia located about 12 km North West of Tozeur. The methodology used is the simultaneous approach of geomorphological and digital analysis of high-resolution satellite data for defining and mapping the desertification landscape. Visual interpretation combined with supervised classification using training site tests allowed us to perform a precise" @default.
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• W104093835 date "2009-12-02" @default.
• W104093835 modified "2023-09-23" @default.
• W104093835 title "Remote Sensing Technology Applications For Desertification Mapping: A Case Study, Oudia Area, Tunisia" @default.
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• W104093835 doi "https://doi.org/10.1007/978-1-4020-8937-4_16" @default.
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