Utilização dos índices ndwi e mndwi na detecção de corpos hidricos em imagens sentinel-2 na bacia hidrográfica do rio traipu – Alagoas

Abstract

The application of remote sensing in support of hydrological studies becomes increasingly common, especially with the use of orbital images. The objective of this research was to identify the water bodies in the Sentinel-2 satellite image through the Normalized Difference Water Index- NDWI and Modified Normalized Difference Water Index (MNDWI) spectral indices. The study area for the application was the Traipu river basin. To prove the best method to be replicated for the whole state, a comparison was made by the spectral indices The results showed that the application of MNDWI had a better spectral response concerning NDWI, where the averages presented values of 0,30, against 0,16, respectively. Therefore, it`s concluded that the MNDWI is more accurate to the representation of the mapped water surface.