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 MODIS satellite imagery using NDVI (Normalized Difference Vegetation Index). 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.
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