This is a deprecated ggplot2 theme developed for the Wisconsin Department of Public Instruction for making PNG or JPG maps
theme_dpi_mapPNG(base_size = 18, base_family = "")
numeric, specify the font size, default is 18
character, specify the font family, this value is optional
A theme object which is a list of attributes applied to a ggplot2 object.
All values are optional
his uses unit
from the grid package extensively.
See also theme_bw
from the ggplot2 package.