[R] Plotting bar graph over a geographical map

[Greg Snow]

If you are willing to use base graphics instead of ggplot2 graphs, then look at the subplot function in the TeachingDemos package.  One of the examples there shows adding multiple small bar graphs to a map.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of sjlabrie
> Sent: Tuesday, January 31, 2012 9:53 PM
> To: r-help at r-project.org
> Subject: [R] Plotting bar graph over a geographical map
> 
> Hi,
> 
> I am looking for a way to plot bar on a map instead of the standard
> points.
> I have been using ggplot2 and maps libraries.
> The points are added with the function geom_point. I know that there is
> a
> function
> geom_bar but I can't figure out how to use it.
> 
> Thank you for your help,
> 
> Simon
> 
> ### R-code
> library(ggplot2)
> library(maps)
> 
> measurements <- read.csv("all_podo.count.csv", header=T)
> allworld <- map_data("world")
> 
> pdf("map.pdf")
> ggplot(measurements, aes(long, lat)) +
>  geom_polygon(data = allworld, aes(x = long, y = lat, group = group),
>  colour = "grey70", fill = "grey70") +
>  geom_point(aes(size = ref)) +
>  opts(axis.title.x = theme_blank(),
>  axis.title.y = theme_blank()) +
>  geom_bar(aes(y = normcount))
> dev.off()
> ###
> 
> 
> 
> 
> --
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