Remote sensing techniques for delimitation of burned areas in Tocantins through Landsat 8-TM digital image processing
DOI:
https://doi.org/10.20873/jbb.uft.cemaf.v8n1.silvaKeywords:
detection, brazilian savannah, fire useAbstract
Methods of detection of burned areas are fundamental for a historical survey, as well as for the sizing of the effects produced by fire on the environment. In this sense, the objective of this work was to evaluate the procedure and methodology for the delimitation of burned areas by processing Landsat 8-TM images, during the period of greatest occurrence of hot flashes in three areas, which are located in the Eastern, Southern and Northern regions of the state of. Tocantins. To obtain the burned areas, image classification procedures were performed aiming at the class of interest (burned area). Initially, pre-processing was performed on the images: radiometric, atmospheric correction and projection system correction. After this step, the images were processed to obtain the Normalized Difference Vegetation Index (NDVI) in images before and after fire, called Im1 and Im2. After obtaining the NDVI, the images were compared pixel by pixel by subtracting the NDVI values, generating a difference image. Supervised rating shows better performance than unsupervised. The highest occurrences of burnt areas were in scenes 221/67 and 222/68 which is related to the climate, vegetation, occupation and land use of the regions covered by these scenes.
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