ABSTRACT:The objective of this work is to study and analyze the human impact on agro-forestry-pastoral ecosystem of Khenchela region through the application of multi-criteria analysis methods to integrate geographic information systems, our methodology is based on a weighted linear combination of information on four criteria chosen in our analysis representative in the vicinity of variables in relation to roads, urban areas, water resources and agricultural space, the results shows the effect of urbanization and socio-economic activity on the degradation of the physical environment and found that 32% of the total area are very sensitive to human impact.
The aim of this work is to analyse barchan dunes migration patterns and their effect on urban and agricultural areas in Ain Salah region in southern Algeria. A supervised classification of Landsat images over a 13 years period (2005, 2009, 2013 and 2017) was applied to create land cover maps which were used for a spatiotemporal monitoring of barchan migration by dune feature changes. The results show that sand dunes covered area has increased between 2005 and 2017 with direction movements from northeast to southwest and represents the potential of using time series imagery for a better understanding of dune migration and sand encroachment.
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