MONITORING THE EVOLUTION OF THE LAND COVER OF OASIS THROUGH SATELLITE IMAGES. CASE: OASIS ZAGORA (MOROCCO)

The observation of environmental and climate change becomes an indispensable need for the management, monitoring and decision making in assessing the state of the Oases Systemswhich represents a word natural heritage that must be preserved and saved. The objective of this study is the detection of changes in land use in the Moroccan oases area, especially the dynamics of changing classes of vegetation, water and sand. Thus, an automated change detection and assessment process has been implemented based on a time series Landsat satellite imagery, covering the period of (1984-2015). The approach is to extract the information needed for change detection from satellite images, this process will be carried out based on the spectral index characterizing land cover (normalized difference vegetation index (NDVI), normalized difference water index (NDWI) and normalized difference iron index (NDII)) and later by realizing a diachronic analysis of the evolution of the territorial dynamics of Zagora oasis system.