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The degradation of natural resources in arid and semi-arid areas was highlighted dramatically during this century due topopulation growth and transformation of land use systems. The Algerian steppe has undergone a regression over the pastdecade due to drought cycle, the extension of areas cultivated in marginal lands, population growth and overgrazing. Thesephenomena have led to different degradation processes, such as the destruction of vegetation, soil erosion, and deteriorationof the physical environment. In this study, the work is mainly based on the criteria for classification and identification ofphysical parameters for spatial analysis, and multi-sources factors to determine the vulnerability of steppe formations andtheir impact on desertification. To do this, we used satellite data Alsat-1 (2009) IRS (2009) and LANDSAT TM (2001).These cross-sectional data with exogenous information could monitor the impact of the semi arid ecological diversity ofsteppe formations. A hierarchical process including the supervised image classification was used to characterize the mainsteppe formations. An analysis of the vulnerability of plant was conducted to assign weights and identify areas mostsusceptible to desertification. Vegetation indices combined with classification are used to characterize the forest and steppeformations to determine changes in land use. The results of this present study provide maps of different components of thesteppe, formation that could assist in highlighting the magnitude of the degradation pathways, which affects the steppeenvironment, allowing an analysis of the process of desertification in the region

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

Impact of climate and analysis of desertification processes in semi arid land in Algeria: using data of Alsat-1 and Landsat