Mapping sub-pixel burnt percentage using AVHRR data. Application to the Alcalaten area in Spain |
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| Authors: | Ana B Ruescas Jose A Sobrino Yves Julien Juan C Jiménez-Muñoz Guillem Sòria Victoria Hidalgo |
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| Affiliation: | 1. Imaging Processing Laboratory, Polígono La Coma s/n (46980 Paterna), University of Valencia, Spainbruescas@uv.es;3. Imaging Processing Laboratory, Polígono La Coma s/n (46980 Paterna), University of Valencia, Spain |
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| Abstract: | The purpose of this work is to estimate at sub-pixel scale the percentage of burnt land using the Advanced Very High Resolution Radiometer (AVHRR) through a simple approach. This methodology is based on multi-temporal spectral mixture analysis (MSMA), which uses a normalized difference vegetation index (NDVI) and a land-surface temperature (LST) image as input bands. The area of study is located in the Alcalaten region in Castellon (Spain), a typical semi-arid Mediterranean region. The results have shown an extension of approximately 55 km2 affected by fire, which is only 5% lower than the statistic reports provided by the Environmental Ministry of Spain. Finally, we include a map of the area showing the percentage of estimated burnt area per pixel and its associated uncertainties. The map was validated through supervised classification of an Airborne Hyperspectral Sensor (AHS) image taken on 27 September 2007. Results have a high accuracy, with a mean error of 6.5%. |
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