STUDY AND DIACHRONIC ANALYSIS OF CHANGES OF GROUND OCCUPATION IN AREA OF ORIENTAL AURES ALGERIA

Abstract

Algeria with its situation and its territorial dimensions count among the countries which have an important natural potential, today's subject of caprices of hue climate aridity, where the effects are conjugate more by intense socialization of ecosystems especially in mountainous and steppe zone big part of the territory is threaded by desertification. The objective of this study is to determine the contribution of the satellite images in the detection of ground occupation changes and to pursuit in forms of degradation between the three dates 1987, 2000 and 2013 in the area of oriental Aurés in Algerian East. Our methodology is based on the use of data of the ground occupation, through the assisted and supervised classification with the method of maximum of images chariness by the satellite Landsat TM of 1987, ETM of 2000 and oil of 2013. The obtained results show the forest cover and the steppe of Alfa and wormwood, they are regressed by against the bare soil and sandy soil; they have a new remarkably increase. This multi temporal study is a diagnostic which allows us in the same time to determine the Phenomena's of degradation which touches in vast areas the Aurés causing a regression of vegetal cover, but also in its evolution between 1987 and 2013.

Keywords

• diachronic analysis
• remote sensing
• land occupation