NDVI differences: comparison between the vegetation indices of March 2007 and those of the historical average.
Description
El conjunto de datos ráster de diferencias de NDVI de secano (Indice de Vegetación de Diferencias Normalizado) del mes de marzo del año 2007 del estudio de Seguimiento de la Evolución Anual de Cultivos y Aprovechamientos contiene el mapa del mes de marzo de diferencias porcentuales de índices de vegetación entre el valor medio mensual de la campaña agrícola del año 2007 y el valor medio mensual de la media histórica (año medio) de toda la serie de años de los que se dispone de imágenes, para toda la superficie de secano y pastizales de las comarcas estudiadas.
To obtain these results, the Ministry of Agriculture and Fisheries, Food and Environment (MAPAMA) has a system for monitoring the evolution of rainfed crops and grasslands, based mainly on the information provided by vegetation indices (NDVI) generated with daily satellite images NOAA-AVHRR. This system has been in operation since 1993, paying particular attention to the detection and localization of drought situations throughout the successive agricultural years, in order to foresee the measures that need to be taken to mitigate its effects. The system is in operation between the months of January and June, the period in which the studied crops are developed.
The study is carried out in the autonomous communities of Navarra, Aragón, Cataluña, Castilla y León, La Rioja, Madrid, Castilla-La Mancha, Comunidad Valenciana, Andalucía, Región Murciana, Extremadura and Baleares, as they comprise almost all rainfed crops and grasslands.
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