Multitemporal analysis of the spectral response of scars of burnt areas using the Landsat/ETM sensor

This study reports the investigation of spectral response changes in burnt events in a multitemporal data series. We have used 8 Landsat/ETM+ scenes for the year 2002. Based on pre-processing techniques of image geographic and radiometric normalization, classification methodology was carried out to detect burn scar areas. Samples of polygons were used to calculate mean and standard deviation values for the assessment of changes in the spectral domain of bands 1 to 5 and 7 to investigating how bands behavior in time. Then we applied an index to the images, utilizing bands 3 and 4 to detect burn scars. This index was tested and showed a consistent performance, enhancing the burned areas. Statistical test were carried out to evaluate differences among the values in each date. Results showed that there are statistical differences among dates, indicating that a burn took place in that date .