Multitemporal analysis of deforestation in the municipality of Tomé-Açú, Pará State, Brazil, from 1985 to 2018
DOI:
https://doi.org/10.4336/2022.pfb.42e201902053Keywords:
Mapping, Classification, AmazonAbstract
The objective of this research was to quantify deforestation, considering the spatial and temporal changes of forest loss for the period from 1985 to 2018. We used Landsat sensor images for the same period, according to orbits/points 223/62 and 223/61. Color compositions, linear contrast enhancement and segmentation were performed. The interpretation and the classification of the images were performed through class discrimination. The polygons were classified in 6 size ranges of deforested areas. Additionally, the mapping results were edited and thematic letters were elaborated. The expansion of deforestation led to a loss of forest of approximately 298 thousand ha between 1985 and 2018 (57% of the municipality area). In all years, high values of polygons were observed in the range ≤ 6.25 ha and reduced value in the range > 50 ha. Small fragments (≤ 6.25 ha) accounted for 15% of all deforestation, while large fragments (> 50 ha) accounted for 45%. The analyzed period showed substantial differences in both temporal analysis and deforestation distribution patterns, indicating a strong potential for future forest loss.
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Copyright (c) 2022 Larissa Melo de Sousa, Osvaldo Ryohei Kato, Marcos Adami, Arlesson Antônio Almeida Souza, Wilson Fernandes Ramos, Igor dos Santos e Silva
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