The color scheme ranges from green (least subjected to surveillance) through yellow and orange to red (most surveillance). Note the '2007' date in the image relates to the document from which the interactive map derives its top secret classification, not to the map itself.
The National...
Basically, this is the companion website to their book/s series on this. Have to say all of there book/s are useful reference tool. Not for just for women, but for men as well. By the way they also have a blog called Our Bodies, Our Blog as well.