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Ahmadu Bello University (2011)

AN ASSESSMENT OF THE MAGNITUDE AND RATE OF DESERTIFICATION IN YOBE STATE, NIGERIA (1970-2005) USING REMOTE SENSING/GIS APPROACH

BILLY, Justin

Titre : AN ASSESSMENT OF THE MAGNITUDE AND RATE OF DESERTIFICATION IN YOBE STATE, NIGERIA (1970-2005) USING REMOTE SENSING/GIS APPROACH

Auteur : BILLY, Justin

Université de soutenance : Ahmadu Bello University

Grade : MASTER OF SCIENCE (MSC) IN GEOGRAPHY 2011

Résumé
Past studies and reports have shown that desertification is slowly but steadily encroaching from the Sahara into the southern latitudes. Research studies have also found out that sand dunes movement and deforestation is usually a prelude to desertification. A combination of Remote Sensing imageries of three different date 1970 (LANDSAT MSS), 1987 (LANDSAT TM), and 2005 (LANDSAT ETM) and Geographical Information System (GIS) techniques were used to analysed desertification in Yobe state. Results show that areas covered by sand dunes increasesd by about 1,323.74 km2 (2.89%) during the study period (1970 - 2005), from 3,124.99 km2 to 4,448.73 km2. From NDV1 analysis non vegetal Cover increased too from 9,310 km2 to 10,002 km2 representing about 582 km (1.09%). Different efforts have been made to stabilize sand dunes encroachment by the settlers, State Government, North-East Arid Zone Development Programme (NEAZDP) and NGO’s, but there is little or no results to combat the adverse effect of desertification. Some of the recommendations include the establishment of shelterbelts in order to counteract adverse ecological condition and the establishment of national desertification commission should be a priority issues.

Mots clés : ASSESSMENT, MAGNITUDE, RATE, DESERTIFICATION, YOBE STATE, NIGERIA (1970-2005), USING REMOTE, SENSING/GIS, SENSING/GIS

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