I have a SpatialPolygonsDataFrame object (sp package).
It contains 40 polygons.
Now I want to join some of the polygones.
I cannot figure out how to do that? Any ideas?
The code below produces a map of Germany and I need to join some
counties.
library(sp)
library(RColorBrewer)
# get spatial data for Germany on county level
con <- url("http://gadm.org/data/rda/DEU_adm3.RData";)
print(load(con))
close(con)
# plot Germany with random colors
col = rainbow(length(levels(gadm$NAME_3)))
spplot(gadm, "NAME_3", col.regions=col, main="German Regions",
colorkey = FALSE, lwd=.4, col="white")
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Mark Heckmann
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