NDVI differences: comparison between the vegetation indices of the month of the current year and those of the historical average
Description
The series of raster maps of differences of NDVI of rainfed (Index of Vegetation of Normalized Differences) of the study of Monitoring of the Annual Evolution of crops and Harvests contains the monthly maps of percentage differences of vegetation indices between the monthly average value of each agricultural campaign and the monthly average value of the historical average (average year) of the whole series of years for which images are available, obtained for each agricultural campaign and each month of study, for the entire area of rainfed land and pastures of the regions studied.
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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