Visual Greenness (VG) ranges from 0-100% and indicates how green each 500-m square pixel of land is in relation to a standard reference such as a highly green agricultural field. A given VG value represents the same level of greenness no matter where it occurs in the state. A value of 100% represents the highest greenness level and 0%, the lowest greenness level. VG is calculated daily from the past 7 days of VIIRS satellite imagery using NDVI (Normalized Difference Vegetation Index). In that 7-day period the highest value of NDVI is used. If a given pixel is cloudy during the entire weekly period, the VG value is not calculated and the pixel appears light blue on the VG map. This map is updated daily when the daily VIIRS satellite data is processed.
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