SEGUIMIENTO MEDIANTE IMAGENES LANDSAT -TM DE LOS DAÑOS PRODUCIDOS POR UN PERIODO PROLONGADO DE SEQUÍA SOBRE ENCINARES EN SIERRA MORENA ( CÓRDOBA ): PRIMEROS RESULTADOS

NDVI (Normalized Difference Vegetation Index) images generated from LANDSAT- TM data were recently used to monitor large scale drought patterns and their climatic impact on vegetation. The purpose of this study is to use of the NDVI and SA VI to assess regional drought impacts. A temporal data for the period of July 1991 to September 1995 were used to produce NDVI and SA VI images of region in north Córdoba. Drought areas were delineated with certain threshold values of those indexes. Drought patterns delinated by the NDVI and SA VI reflected anomalies because of vegetation cover. It is suggested that NDVI may be used to construct a large scale drouhgt control model, but a further research should be carry out to analyze temporal and spatial evolution of regional drought.