Continental US displaying raw NDVI values with Canada and Mexico masked out. 
Agricultural Statistics District boundaries are displayed in brown and state boundaries are black. 
Image displayed on graphic is 2011.
See the comparable Weekly Weather and Crop Bulletin at <"http://usda.mannlib.cornell.edu/MannUsda/viewDocumentInfo.do?documentID=1393">Weekly Weather and Crop Bulletin</a> for details.