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Caracterização da área queimada à escala global (1982-1999) e análise de alguns dos seus impactos climáticos e ecológicos
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Autores
Orientador(es)
Resumo(s)
The recent awareness to what would be the climate change consequences, namely in the
observed changes in the fire regimes, highlight the urgency for piro-climatic studies. The lack of
an historical burnt area dataset to complement recent products, covering the global extent and its
full variability,makes it difficult to detect significant trends. Due to the lack of global information
before year-2000, a burned area product based on the NOAA Pathfinder AVHRR land (8km) dataset
was developed covering the period from 1981 to 1999. As reference we screened the World
Fire Atlas dataset, by removing all the non wildfires and false alarm information and we addressed
the expected detectable area made by the coarser sensor. Data pre-processing was prefomed
by removing the satellite orbital drift trends with empirical mode decomposition and a burned
area classification was done based on the Random Forest classification algorithm. Although the
developed methodologies allowed to overcome many of the technical difficulties and the results
showed high flexibility to cover the full extent of possible fire occurrences, burned areas were
characterised by large underestimation. This is mainly explained by the PAL re-sampling procedure
and by the limitations of the coarser sensor to detect certain burned scar spatial patterns.
Descrição
Doutoramento em Engenharia Florestal - Instituto Superior de Agronomia
Palavras-chave
burnt area spatial paterns AVHRR orbital drift EMD random forest
Contexto Educativo
Citação
Mota, B.W.C. - Caracterização da área queimada à escala global (1982-1999) e análise de alguns dos seus impactos climáticos e ecológicos. Lisboa: ISA, 2012