The raster data set of average monthly vegetation indices for the month of April 2007 of dry NDVI (Standard Difference Vegetation Index) of the study of Monitoring the Annual Evolution of Crops and Harvestings represents the vegetation indices with the average value of the month of April, obtained in the 2007 agricultural season, for the entire dry and grassland area of the regions studied.
These monthly average indices intersect with thematic mapping and are compared with the average monthly data of the historical series.
To obtain these results, the Ministry of Agriculture and Fisheries, Food and Environment (MAPAMA) has a system for monitoring the evolution of dry and grassland crops, based mainly on the information provided by vegetation indexes (NDVI) generated with daily satellite images NOAA-AVHRR. This system has been in operation since 1993, paying particular attention to the detection and tracing of drought situations throughout successive agricultural campaigns, in order to provide for the necessary measures to mitigate their effects. The system is in operation between the months of January and June, a period in which the studied crops are developed.
The study is carried out in the autonomous communities of Navarra, Aragon, Catalonia, Castile and Leon, La Rioja, Madrid, Castilla-La Mancha, Valencian Community, Andalusia, Murcia Region, Extremadura and Balearic Islands, as they comprise almost all dry crops and grasslands.
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