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2011 Apr 03
0
Plotting data on a US County Map
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4 US004 5
5 US005 6
6 US006 7
7 US007 9
8 US008 9
9 US009 10
10 US010 11
11 US011 13
12 US012 15"),head=TRUE,stringsAsFactors=FALSE))
library(maptools)
library(ggplot2)
library(gpclib)
gpclibPermit()
setwd("C:/Documents")
us_counties.shp <- readShapeSpatial("uscounties.shp")
us_counties.shp.p <- fortify.SpatialPolygonsDataFrame(us_counties.shp,
region="CNTY_FIPS")
us <- merge(us_counties.shp.p, us_counties.shp, by.x="id", by.y="CNTY_FIPS")
p <- ggplot(data=us, aes(x=long, y=lat, group=group)) +
geom_polygon(fill=&...