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Abstract
The northern region of Minas Gerais is considered a transition area between the biomes Caatinga and Savanna, with predominance of the Savanna and its variations. It is common to the occurrence of fires, which can be caused naturally or by anthropogenic actions, resulting in changes in the landscape. In this sense, the study aims to evaluate from time series of LANDSAT-5/TM and MODIS/TERRA images the process of natural recovery of vegetation after the identification of operational pixels corresponding to the burned areas. The results of the research are based on the response of the municipality test of Pai Pedro/MG. We can observe that was detected a hotspots pixel on the day 08/04/2008 through images MOD14A1, which validation was performed from the survey of burned areas conducted by INPE - National Institute of Space Research. From the identification of operational pixel of burned was evaluated the dynamics of recovery of the area through the vegetation index NDVI (Normalized Difference Vegetation Index), generated by images MODIS/TERRA, product MOD13Q. The scars of burned analyzed, approximately 52% were detected. Despite this limitation, much of the area impacted was identified. The errors of omission were considered satisfactory, with a view to the technical limitations of spatial resolution of the sensors used.
Highlights
The state of Minas Gerais has valuableEnvironmental Conservation Units and a growing need to eliminate the risk of fires in these areas
With regard to outbreaks MODIS (AQUA and TERRA), INPE has developed an algorithm for detection of outbreaks of burning in a conservative way, so as to minimize false alarms associated with noise and the solar reflection occasional in water bodies and exposed soil in daytime images (INPE, 2010)
The information on the accuracy of the algorithms must be constantly updated because, over time, the performance of the sensors and their conditions radiometric characteristics are altered. This analysis can be performed from the mapping of scars burned in scenes of average resolution and the comparison of these with the spatial location of outbreaks of burned in images of spatial resolution low. In this context this paper had as its goal the creation of an algorithm that enables the identification of operational standards and/or scars of fires, from the association of a geographical information system and temporal data obtained from NDVI/MODIS images and MOD14A1, taking as reference archives of outbreaks of heat released by INPE
Summary
The state of Minas Gerais has valuableEnvironmental Conservation Units and a growing need to eliminate the risk of fires in these areas. The knowledge of the causes and the frequency with which events of fires occur is of paramount importance, especially taking into consideration that the starting point for the preparation of plans for prevention and know who (or what) started the fire (Santos, 2004) In this context, the National Institute for Space Research/INPE since the 1980s has been improving a system for detecting fires from images of sensors on board satellites polar and geostationary. This analysis can be performed from the mapping of scars burned in scenes of average resolution and the comparison of these with the spatial location of outbreaks of burned in images of spatial resolution low In this context this paper had as its goal the creation of an algorithm that enables the identification of operational standards and/or scars of fires, from the association of a geographical information system and temporal data obtained from NDVI/MODIS images and MOD14A1, taking as reference archives of outbreaks of heat released by INPE.
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