Temporal variation of NDVI and SAVI in Ilha Grande in the city of Angra dos Reis, Rio de Janeiro, Brazil

Abstract

As urban areas expand, vast tracts of vegetation cover fragment, which can lead to loss of biodiversity. Ilha Grande is the largest island in the bay of Angra dos Reis, RJ, and an important remnant of the Atlantic Forest, with a diverse ecosystem and high biological richness. In view of the continuous population increase and growing tourist demand, there were greater territorial occupations and land use in this region. In this context, the objective of the study was to analyze the vegetation cover and land use in three winter dates in the years 2013, 2018 and 2023 in Ilha Grande, Angra dos Reis, RJ. For this, images obtained from the Landsat 8 satellite were used and the NDVI and SAVI were calculated. The results indicated that 2018 had the lowest NDVI and vegetation cover values, as well as the visual expansion of the urban area. These results corroborate the growing concern about the expansion of urban centers into environments with natural vegetation.