[R] barplot and map overlay

From: Héctor Villalobos <hvillalo_at_ipn.mx>
Date: Mon, 11 Jun 2007 18:45:17 -0600


I wonder if it is possible with the graphics package to overlay one or several plots (barplots, for example) over a map. Data for the map is in a data frame with the latitude and longitude coordinates, and then:

> plot(map$long, map$lat, type ="l")

produces the map. I want to put each barplot in specific locations on the map, namely at the center of "statistical squares".

I´ve seen an example in Paul Murrell´s "R Graphics" book that seems appropriate (grid package), but a bit complicated.

Thanks a lot for any advice.


Héctor Villalobos <hvillalo_at_ipn.mx>
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 La Paz, Baja California Sur, MÉXICO. 23000
 Tels. (+52 612) 122 53 44; 123 46 58; 123 47 34  ext. 2425
 Fax.  (+52 612) 122 53 22

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