PRISM copyright information, ready made for maps made using R

I like to use R for GIS work, often with weather data which has attributions frequently. One of them is the PRISM Climate Group at Oregon State, which makes data freely available for use but you must credit them, see http://http://www.prism.oregonstate.edu/terms.phtml.

To do this quickly and automatically in my R maps I made this bit up to automatically put the proper date format and date into the copyright statement on the maps I generate using this data and put this code at the beginning of my R script file that I’m working with.

prism.date <- format(Sys.time(), '%b %d %Y')
prism.info <- 'Copyright © 2010, PRISM Climate Group, Oregon State University, http://www.prismclimate.org Map created'
prism.copyright <- paste(prism.info, prism.date, sep = ' ')

Then put it on the graphic.

mtext(prism.copyright, side = 1, adj=.01, cex = 0.5)

This left aligns it on the bottom of the map.