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An adequate assessment of the fire risk is of great importance for developing fire-prevention policies. Two important indices, that have been frequently used to estimate the level of fire risk, are the Fire Weather Index (FWI) and the Normalized Difference Vegetation Index (NDVI). The main purpose of the present study was to analyse the NDVI index variability during different summer time periods for Vitosha mountain region in order to assess his applicability for accessing the associated risk of fire. A comprehensive spatial and temporal data regarding the distribution of the NDVI index obtained through satellite data (using aerospace technology), GPS and above-ground data, and rationalised using the GIS approach have been applied. The data obtained demonstrate that immediately after a fire, the NDVI for BR “Bistrishko branishte” reached a negative value -0.025(±0.346). The lowest NDVI: +0.17 (±0.339) was found for the image taken on 16.08.2012, about two months before the fire occurrence. Overall, the results show that the NDVI data could be successfully used as an indicator for identifying locations with an elevated summer vegetation dryness and provide important information on vegetation sites with an increased fire susceptibility. Therefore development of a fire risk assessment methodology based on using NDVI data, especially during summer periods, appears to be a promising technique for regions, where the fire events have been frequently observed.

APPLICATION OF AEROSPACE DATA FOR FOREST FIRE RISK ASSESSMENT AND PROGNOSES. A CASE STUDY FOR VITOSHA MOUNTAIN