Atualização de Documento

XVI SBSR

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Resumo	(*)(?)	Vegetation fires in South America are operationally monitored by INPE in images from distinct polar and geostationary satellites. Fundamental in this system is to ascertain the fire pixel data concerning omission and commission errors in order to determine their effective use in fire control, statistics, and policies, and in derived products as estimates of biomass burning emissions. In this paper the INPE-generated fire pixels are verified against fire scars manually mapped in TM/Landsat-5 images during 40 days in the area of the National Park of Serra da Canastra, MG, on Sept-Oct/2007. The 8,650 km2 analized belong to the Cerrado/Savanna biome, which in the last decades has undergone anthropic stress with intensive fire use. 442 INPE fire pixels and 395 scars were obtained. If the location accuracy allows for a deviation up to the maximum pixel size (~3km for MODIS, ~4km for AVHRR, ~5km for GOES and ~7km for Meteosat), omission errors were 20% and commission errors were negligible. Image navigation errors of a few kilometers in geolocation which may occur in the images also contribute to this deviation. A comparison between the MODIS fire detections using the INPE and the NASA/UMD Collection 5 algorithms is also included, with the latter producing more and better located fire pixels. Recommendations for future algorithms are: pixel size (i.e., scanning angle) inclusion to indicate the fire nominal accuracy, and the use of topography data in conjunction to the sensor scanning angle and direction to analyze missed detections in steep mountain slopes.
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