[ Détection localisée des zones dégradées de végétation par télédétection: application à la zone de transition entre le bassin sédimentaire et le socle cristallin (Centre – Bénin) ]
Volume 11, Issue 2, November 2014, Pages 477–493
E.A. Tchibozo1 and O.P. Toundoh2
1 Maître assistant (CAMES), Département de géographie et aménagement du territoire, FLASH, Université d'Abomey Calavi, Benin
2 Etudiant de Master, Cartographie et sciences de la géoinformation, RECTAS, Université Obafemi Owolowo Ilé Ifè, Nigeria
Original language: French
Copyright © 2014 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This paper aims to assess the degradation of vegetation in the transition zone between the sedimentary and crystalline in central Benin. The method used is the geomatics and includes the photo - interpretation assisted image classification, the calculation of vegetation indices and spatial analysis. The results show that despite its high coverage (75.21%), unevenly distributed among the dense forest (40, 50%), open forest (15.03%), woodland (16.47%) and tree and shrub savannah (28.00%), large bare surfaces indicate a risk of desertification and loss of vegetation. Image processing from vegetation indices showed that the degraded vegetation is characterized by low coverage containing low biomass and having a healthy and low density. The highest rate of degradation of vegetation varies. The sharp deterioration represents 8.89% of the dense forest, 76.83% of the woodland, 72.89% of woodland and 100% of the tree and shrub savannah. Degradation of vegetation is related to the importance of human pressure in the south and center of the study area, the sedimentary basin, and insufficient water in the North, on the crystalline basement.
Author Keywords: degradation, Centre-Benin, vegetation indices, image processing, coverage, desertification.
Volume 11, Issue 2, November 2014, Pages 477–493
E.A. Tchibozo1 and O.P. Toundoh2
1 Maître assistant (CAMES), Département de géographie et aménagement du territoire, FLASH, Université d'Abomey Calavi, Benin
2 Etudiant de Master, Cartographie et sciences de la géoinformation, RECTAS, Université Obafemi Owolowo Ilé Ifè, Nigeria
Original language: French
Copyright © 2014 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
This paper aims to assess the degradation of vegetation in the transition zone between the sedimentary and crystalline in central Benin. The method used is the geomatics and includes the photo - interpretation assisted image classification, the calculation of vegetation indices and spatial analysis. The results show that despite its high coverage (75.21%), unevenly distributed among the dense forest (40, 50%), open forest (15.03%), woodland (16.47%) and tree and shrub savannah (28.00%), large bare surfaces indicate a risk of desertification and loss of vegetation. Image processing from vegetation indices showed that the degraded vegetation is characterized by low coverage containing low biomass and having a healthy and low density. The highest rate of degradation of vegetation varies. The sharp deterioration represents 8.89% of the dense forest, 76.83% of the woodland, 72.89% of woodland and 100% of the tree and shrub savannah. Degradation of vegetation is related to the importance of human pressure in the south and center of the study area, the sedimentary basin, and insufficient water in the North, on the crystalline basement.
Author Keywords: degradation, Centre-Benin, vegetation indices, image processing, coverage, desertification.
Abstract: (french)
La présente contribution vise à évaluer la dégradation de la végétation dans la zone de transition entre le sédimentaire et le cristallin au centre Bénin. La méthode utilisée relève de la géomatique et regroupe la photo – interprétation par classification assistée d'image, le calcul des indices de végétation et l'analyse spatiale. Les résultats obtenus montrent que malgré son taux de couverture élevé (75,21%), inégalement réparti entre la forêt dense (40, 50%), la forêt claire (15,03%), la savane boisée (16,47%) et la savane arborée et arbustive (28,00%), de vastes surfaces dénudées indiquent un risque de désertification et la perte de végétation. Le traitement d'image à partir des indices de végétation a montré que la végétation dégradée est caractérisée par une faible couverture contenant une faible biomasse et présentant une santé et une densité faibles. Le taux le plus élevé de la dégradation des formations végétales est variable. La forte dégradation représente 8,89% de la forêt dense, 76,83% de la forêt claire, 72,89% de la savane boisée et 100% de la savane arborée et arbustive. La dégradation de la végétation est liée à l'importance de la pression anthropique au sud et au centre de la zone d'étude, sur le bassin sédimentaire, et l'insuffisance d'eau au Nord, sur le socle cristallin.
Author Keywords: dégradation, Centre –Bénin, indices de végétation, traitement d'image, taux de couverture, désertification.
How to Cite this Article
E.A. Tchibozo and O.P. Toundoh, “Localize detection of degraded vegetation zone by remote sensing: application to the transition zone between the sedimentary basin and the crystalline basement (Centre – Benin),” International Journal of Innovation and Scientific Research, vol. 11, no. 2, pp. 477–493, November 2014.
