Create the base of a soc.ca map
map.ca.base(
up = NULL,
down = NULL,
right = NULL,
left = NULL,
base_size = 15,
...
)
a ggplot2 object
the name of + pole on the vertical axis - "North"
the name of the - pole on the vertical axis - "South"
the name of the + pole on horizontal axis - "East"
the name of the - pole on the horizontal axis - "West"
controls the text size of themed labels
further arguments are passed onto ggplot()