ANÁLISE DA DETECÇÃO E OCORRÊNCIA DE QUEIMADAS EM ÁREAS URBANIZADAS E ENTORNO

Abstract

Wildfires cause damage on environment, human healthy and public or private property. Hotspots are the main way to monitor the occurrence of fire and burned areas in Brazil. However, they present limitations that can disturb the real incidence of fire in some places. This study analyzed the events of fires faced by teams of firefighters in green areas of some cities from Tocantins State and their relationship to hotspots detected by several sensors during the 2012 year. Data from 346 faced fire reports showed the occurrence of 1,42 events/km² in urban areas. In distances until 9 km from the fire events were registered 950 hotspots from 17 sensors, being 40% of them from AQUA_M-T and TERRA_M-T. The analysis regarding fire and hotspot happening in the same day revealed that only 7,8% of the fires could be detected by any sensor that register hotspots, even when we consider distances until 9 km between the both. Nevertheless, others 89,5% of intersections between fires and hotspots were happened, but in interval-times longer than 2 days. Those results highlight the impracticability to use hotspots as fire monitoring tool in urban areas and the great potential to make mistakes when they are employed satellite images with long interval-time to validate hotspots and burned areas. Palavras-chave: hotspots, wildfire, focos de calor, incêndios florestais, validação.