AVALIAÇÃO DE ÍNDICES ESPECTRAIS OBTIDOS COM IMAGENS SENTINEL-2 E LANDSAT 8 ANTES E APÓS ROMPIMENTO DA BARRAGEM DA MINA DO FEIJÃO, BRUMADINHO – MG: Evaluation of spectral indexes obtained with SENTINEL 2 and LANDSAT 8 images before and after break of the Feijão Mine Dam, Brumadinho – MG

Evaluation of spectral indexes obtained with SENTINEL 2 and LANDSAT 8 images before and after break of the Feijão Mine Dam, Brumadinho – MG

Abstract

Remote sensing techniques have been largely used in several environmental analyzes. So they have effectively helped many studies related to soil changes and vegetation health situation. The vegetation index allows straightforward effective analysis of the biomass and the vegetative vigor presented by a region. This paper performed an analysis of the Normalized Difference Vegetation Index (NDVI), by comparing the results obtained with Operational Land Imager (OLI) and Multispectral Instrument (MSI) sensor images. Furthermore, it compared the application of index in images with and without the atmospheric correction techniques. The study area consisted in the region of the Feijão Mine, in Brumadinho – MG where a dam disruption occurred on January 25, 2019.  The study results allowed comparing the images with and without the use atmospheric correction as well as analyzing the region behavior before and after the accident.