TEMPORAL EVOLUTION OF THE NDVI AS AN INDICATOR OF FOREST-FIRE DANGER

This work presents a study of the possibility of estimating forest fir e danger by means of the analysis of the temporal evolution of the Nor malized Difference Vegetation Index (NDVI) Advanced Very High Resoluti on Radiometer (AVHRR). Images of Spain corresponding to areas of Valen cia and Eastern Andalusia in 1993 have been used. The slope of the evo lution curve of the NDVI is an indicator of water stress and it is use d to estimate danger. Forested areas are previously selected using the NDVI integral in the period studied. In order to determine the reliab ility of the index, ground data measured by the Spanish National Fores try Service (ICONA) are available to us.