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Master Thesis

Analyse paysagère des changements d'usage des terres sur l'état du couvert forestier à Paragominas, Para (Brésil)

Abstract : Today, Paragominas, a characteristic amazonian pioneering front municipality, has a complex landscape matrix composed of agricultural and forest elements. The combined use of soils and landscapes is changing qualitatively despite a slowdown in deforestation at the Brazilian legal Amazon scale (INPE) and the stabilization of the landscapes spatial structuration induced. Assuming that the spatial landscapes organization reflects agricultural practices, this study has the methodological objective of evaluating remote sensing data to map the land cover at different dates and to particularly characterize the Synthetic Aperture Radar (SAR) images contribution to supervised classifications using the "Random Forest" algorithm. On the basis of these detailed land-use maps, calculations of landscape metrics and transition trajectories will provide answers to the thematic objective of understanding how changes in land use have influenced the state of the forest land cover. The first results show that detailed mapping at the municipal level is possible to obtain. It has been determined, after comparing the sensors, that the fusion of radar images with optical images gives the best results in terms of classification with a kappa index of 0.83. However, the classifications derived from optical data (Sentinel-2 and Landsat 8) have the advantage of requiring less variables input into the model to achieve a stabilization of the kappa index at a satisfactory level (at, 78 and 0, 81 respectively) compared to the classification resulting from the fusion of radar and optical images. This aspect is to be considered for a methodology that aims to be reproducible with a quick calculation time and ease of execution.
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Master Thesis
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Submitted on : Friday, May 24, 2019 - 11:07:18 AM
Last modification on : Wednesday, June 23, 2021 - 1:18:01 PM


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  • HAL Id : dumas-02138854, version 1


Florent Rumiano. Analyse paysagère des changements d'usage des terres sur l'état du couvert forestier à Paragominas, Para (Brésil). Géographie. 2018. ⟨dumas-02138854⟩



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