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Title: Evolução na cobertura do solo e desmatamento no município de Timbiras, Maranhão, entre 2014 a 2018: classificação a partir de imagens landsat 8
Other Titles: Evolution in land cover and deforestation in the municipality of Timbiras, Maranhão, between 2014 and 2018: classification from landsat images 8
Authors: CAMPOS, Adenilson de Andrade
Keywords: Sensoriamento remoto
Índices de vegetação
Cobertura do solo
Remote sensing
Vegetation indexes
Land cover
Issue Date: 9-Jan-2019
Publisher: Universidade Federal do Maranhão
Description: ABSTRACT This study estimated the variation in vegetation cover and deforestation in the limits of the municipality of Timbiras, Maranhão, between 2014 and 2018 by geoprocessing techniques including the calculation of NDVI and SAVI vegetation indexes. Degradation and loss of natural areas are between the major environmental problems arising from anthropic factors. In Brazil, there is a history of forest loss, and in most of the country's tropical and humid forests, deforestation is a difficult problem to solve especially with important updates in the New Forest Code. The demand to produce primary data on the extent of deforestation is emphasized. The municipality of Timbiras located in the eastern Maranhão has an area of 1,486.58 km², totally enclosed in the Cerrado biome domain, with typical vegetation of the region, with fields, ombrophilous forest, and formations of transition like Babassu. Landsat8 satellite images were used to calculate and map vegetation indices. The points identified as deforestation were validated by comparison with data from the Deforestation Monitoring Project in the Legal Amazon by Satellite (PRODES) and the Deforestation Detection System in Real Time (DETER). For the NDVI, the time series showed variation, not significant between the years. However, a great variation was observed for the lowest values between the years 2014 and 2015, due to the increase in planting areas. NDVI behaved more linearly in the time series analyzed, while SAVI values fluctuated within the confidence interval, revealing greater sensitivity to changes in coverage. The municipality of Timbiras has maintained moderate levels of deforestation. The increment of the deforested area for the time series analyzed was 16.3 km² per year. The highest concentration of newly deforested areas, however, was in the nearness of the urban area within a radius of up to 10km from the headquarters. Many points of deforestation were also observed in the proximity of fragments characterized as riparian forest, which indicates that the degradation process still finds support in the lack of consciousness and in the low or inefficient inspection.
Appears in Collections:TCCs de Graduação em Ciências Naturais /Biologia do Campus de Codó

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