ANALYSIS OF THE PROCESS OF ENVIRONMENTAL DEGRADATION OF AREAS OF SWAMP IN THE REGION NORTH OF MINAS GERAIS FROM TEMPORAL SERIES OF IMAGES

Cristina Rodrigues Nascimento

Abstract


Environmental studies to characterize the process of environmental degradation of different ecosystems are extremely complex. In recent years, satellite images have become a great ally in these types of study, since they have the advantage of allowing the joint analysis of different variables, especially when associated with the temporal series. In this perspective, the study aimed to analyze the process of environmental degradation in areas of meadows, at the southern end of the basin of the Urucuia river, situated in the North of the state of Minas Gerais, from LANDSAT-5/TM images. Characterized by a transition region between the biomes savanna and caatinga, areas of meadows suffer strong anthropogenic pressures that are promoting major disturbances and disfiguration of the entire ecosystem. For the analysis were studied images of months more dry (July and August) for the years 1984, 1990, 2000 and 2010. The areas of meadows have been identified and mapped and then there was an automatic segmentation and analysis of the NDVI (Normalized Difference Vegetation Index) to study the dynamics of this environment. The results showed that during the period analyzed, these areas fell by around 9.61 times, mainly due to silting. The NDVI showed behavior similar to those observed in areas of paths, i.e. there was a change on the surface of the water for values corresponding to areas of exposed soil in the advanced stage of deterioration. The greatest period of degradation was observed between the decades of 1980’s and 1990’s with reduction in these areas around 88.29 %.


Keywords


Environmental modeling, NDVI, anthropogenic actions.

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DOI: https://doi.org/10.29150/jhrs.v2i5.22686

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