Uso dos índices NDVI e tgsi para distinção de áreas desertificadas no Ceará

Abstract

The remote sensing application to identify desertified areas, or areas in desertification process have been gaining traction as the food demand increases and the plantation areas become smaller. A good example of an area that lost its production capacity is the Núcleo de Desertificação de Irauçuba, located in North of the Ceará Estate area. In this research, a variable analysis was contemplated, including vegetation cover and Soil Granulometry, represented by NDVI and TGSI respectively, to enable a comparison between this data to a not desertified area, in Sobral’s National Forest. Using images obtained through the Landsat 5 and 8 satellites through the United States Geological Survey platform to acquire the scenes since 2000 until 2008 being projected by the Envi 4.8 software, we reached the conclusion that the only two indices are not able to define the desertification condition of an area, only we can infer that the Floresta Nacional de Sobral is in a condition similar to an area inserted the Núcleo de desertificação, suffering from a shortage of vegetation cover, which can cause irreversible damages in the area.