Espectral indexes, Landsat, Brígida Basin

The study and analysis of the space-time dynamics of a region provides data on the level of changes that occur in a specific location over time. This information on changes benefits the decision-making and supports local management on how to deal with difficulties that may arise, and the method that helps to generate this data is the remote sensing. The present work involves the use of remote sensors on board of the Landsat 5 – TM and Landsat 8 – OLI satellites, which provide spectral bands that will be processed to generate the spectral indices: Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Normalized Difference Water Index (NDWI) and Modified Normalized Difference Water Index (MNDWI). The indices will provide information on the space-time dynamics of the vegetation and water areas of three reservoirs in the Brígida River Basin, located in Pernambuco, as well as the Chapada do Araripe region insert in the basin, in eight satellite images on different dates, which are from June 16, 1990, November 1994, September 23, 1997, July 6, 2003, November 27, 2009, September 9, 2013, July 15, 2018 and October 30, 2022. The results of this dissertation observed a decrease in the amount of vegetation vigor in the basin and wetland in the studied reservoirs, over the dates, highlighting the image of the date of September 9, 2013, which showed the lowest values in the vegetation and water indices.