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Monitoring Forest Recovery in Protected Forests of northern Côte d’Ivoire Using Landsat Imagery and Intensity Change Analysis

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Advances in Remote Sensing 2022年第2期11卷 17-37页

作者： n’guessan simon andon Avy Stéphane Koffi Farid Traoré Patrick n’Gatta Department of Geography Université Peleforo GON COULIBALY Korhogo C&ocirc te d’Ivoire Department of Geosciences Université Peleforo GON COULIBALY Korhogo C&ocirc te d’Ivoire Institut de l’Environnement et de Recherches Agricoles Ouagadougou Burkina Faso

In this paper, the initiatives of reforestation of the national forests of the north of the Côte d’Ivoire were examined using geomatics and the analysis of change of intensity by taking the case of the protected Forest of Badénou (PFB). A spatial analysis based on multi-spectral and multi-temporal Landsat imagery was carried out to assess land cover changes in the (PFB) over the past two decades and determine whether patterns of change in terms of the intensity of gains/losses of each of the land cover classes were active or dormant between the period before (2000-2013) and after (2013-2019) the reforestation initiative. Five main classes were identified: forest (dry deciduous and gallery forests), tree savannah, shrub/grassy savannah (including agricultural lands), bare lands (bare soils and degraded land areas), and water course. All classes were satisfactorily classified, with an excellent producer’s and user’s and overall accuracies and very good Kappa coefficients. The results showed that between 2000 and 2019, the forest cover in the PFB increased from 7778 ha to 5054 ha, a decrease was marked between 2000 and 2013 of approximately 60% compared to its size in 2000, while a slight increase between 2013 and 2019 (4645 ha to 5054 ha) i.e. around 9%) certainly due to the reforestation since 2016. As for the annual intensities of change for each class in both study periods, changes (gain or loss) in forest and tree savanna were relatively dormant after reforestation, while annual bare land gain was relatively active and marked, indicating that degradation of forests remains a threat to the sustainability of the PFB. Forest degradation has occurred mainly in the eastern parts of the PFB, while the central parts have regained more tree cover. These results can help identify conservation and restoration priorities and improve the overall management of the PFB.

关键词： Forest Degradation Reforestation Forest Cover Monitoring Intensity Change Analysis Desertification

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