Validação e refinamento dos produtos de área queimada baseados em dados MODIS para a região do Jalapão/TO

This paper presents a continuity of previous studies describing the validation of two low-resolution Moderate Resolution Imaging Spectroradiometer (MODIS) burned area (BA) products: AQM (1 km) and MCD64A1 (500 m), provided by INPE and NASA, respectively, to the expanding period of 10 years (2005 – 2014) over Cerrado ecosystem region, located in Parque Estadual do Jalapão, in the east of Tocantins. The accuracy assessment was performed using BA maps derived from medium-resolution (30 m) Landsat imagery. Results show that overall accuracy is similar in MCD64 and AQM products, but MCD64 product presents very high occurrence of omission errors (> 60%), however has low commission errors (< 10%). The opposite occurs with the AQM product, which has a balance in commission errors and omission cases. The Dice Coefficient (DC) index was used to evaluate the similarity between the classifier and the reference map in terms of the number of common burned pixels. The AQM product presents DC values higher than MCD64 product, showing a greater overlap between fraction of pixels classified as burned to those truly burned in the reference map. An improved version of AQM was tested and validated over the years of 2010 and 2014, showing a clear reduction of commission errors. Palavras-chave: remote sensing, verification, fire, Landsat, sensoriamento remoto, verificação, fogo.