Comparação de três métodos de mapeamento de cicatrizes de áreas queimadas na Terra Indígena Marãiwatsédé, MT

This work presents the comparison of three mapping methods for burned areas, among which two are based on spectral index compositions such as NDVI and NBR and one in the use of the shadow fraction of the Linear Spectral Mixture Model. Aiming to develop or adapt a semiautomatic method of mapping and monitoring burned areas scars for the Amazon, it was adopted the surrounding rectangle of 71 km x 87 km around the Marãiwatsédé Indigenous Land, included in the path/row Landsat 224/068, located in the northeastern portion of the state of Mato Grosso. In the application of each method were analyzed the “OLI” orbital images of medium spatial resolution (30 m) of the Landsat 8 satellite from two distinct dates (Pre-fire - Time 1 and Post-fire - Time 2). The comparison between the methods and the reference interpretation made possible to generate class maps and contingency tables. The three methods presented reliable results, but the errors and execution time analysis pointed to the Melchiori method, which produced good results both in the percentage of omission and commission errors (inclusion) and in the execution time for the tested area. It could be tested for new areas and/or images from other sensors and satellites.