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Historic Drought Frequency
More
The maps depict the frequency of severe drought in areas where: i) 30 percent of the cropped land; or ii) 50 percent of the cropped land has been affected. The historical frequency of severe droughts (as defined by ASI) is based on the entire the times series (1984-2017).
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>30% of the cropland affected
>50% of the cropland affected
Historic Drought Frequency
More
The maps depict the frequency of severe drought in areas where: i) 30 percent of the cropped land; or ii) 50 percent of the cropped land has been affected. The historical frequency of severe droughts (as defined by ASI) is based on the entire the times series (1984-2017).
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>30% of the cropland affected
>50% of the cropland affected
The seasons’ progress is based on the long-term average of vegetation phenology for each pixel. This simplification implies that the crop/pasture phenology is static and therefore the growing seasons progress at a constant rate each year.
Start of Season (SOS) indicates the period of a crop/grass’s emergence, and is defined as the point when the NDVI reaches 25 percent of its maximum value.
Maximum of Season (MOS) indicates the period when the crop/grass’s foliage is fully developed, prior to the harvest period. It is calculated as the point when the NDVI is at its maximum value.
End of Season (EOS) indicates when the crop/grass has reached full maturity, and is defined as the point when the NDVI is at 75 percent for crop and 25 percent for grass of its maximum value (MOS).
The seasons’ progress is based on the long-term average of vegetation phenology for each pixel. This simplification implies that the crop/pasture phenology is static and therefore the growing seasons progress at a constant rate each year.
Start of Season (SOS) indicates the period of a crop/grass’s emergence, and is defined as the point when the NDVI reaches 25 percent of its maximum value.
Maximum of Season (MOS) indicates the period when the crop/grass’s foliage is fully developed, prior to the harvest period. It is calculated as the point when the NDVI is at its maximum value.
End of Season (EOS) indicates when the crop/grass has reached full maturity, and is defined as the point when the NDVI is at 75 percent for crop and 25 percent for grass of its maximum value (MOS).
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