Dot Distribution Map

Dot distribution maps show different types of information through the use of dots.  The higher the density of dots, the higher numerical value they are representing.  The above map is of corn for grain in harvested acres in 2002.

http://www.agcensus.usda.gov/Publications/2002/Ag_Atlas_Maps/Crops_and_Plants/pdf/02-M177-RGBDot1-largetext.pdf