Cumulative differences NDVI: comparison between the accumulated vegetation indices from January to June 2008 and those of the historical average
Description
The map of accumulated differences of NDVI (Normalized Difference Vegetation Index) of rainfed from January to June of the year 2008, included in the study of Monitoring of the Annual Evolution of Crops and Harvests, contains the percentage differences of the accumulated vegetation indices in the period from January to June of the year 2008 and the corresponding values of the average year (average of the series of years for which images are available).
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 provide for the necessary measures 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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