There are quite some nice possibilities to analyse spatial data in R and in the context of my current project I would like to use R more frequently to do that. Until now I plot my maps with ggplot2 ...
I am trying to overlay dots of arbitrary sets of longitude-latitude coordinates on top of a United States map. So far I have found the D3 cartography example, but when I try to place dots on X,Y ...
A recent post on Cartastrophe refers to a "Worldwide Campaign to Eliminate Needless North Arrows." So when, if ever, are North arrows necessary? As an interesting aside the concept of North being ...