On 04/08/2008 1:14 PM, John P. Burkett wrote:
My goal is to prepare a thematic map of the US, with states shaded
according to their values for a variable of interest. I would like to
include an inset for Alaska in the upper left and an inset for Hawaii in
the lower left. If possible, I'd like to use Albers conic projection, or
something similar. Thus far I have tried using the maps package with
its state database (which omits Alaska and Hawaii) and the gmaps package
(which places an inset for Alaska in the lower left and uses a
projection [Miller cylindrical?] that distorts states along the northern
and southern fringe). I would be very grateful for suggestions about
alternative approaches.
Alaska and Hawaii are in the world map, coded as regions USA:Alaska and
Hawaii:Hawaii.
I believe you can plot the states data, then add Alaska and Hawaii at
locations of your choice afterwards. I don't know how to do multiple
regions on the same plot, but here's how to do the components:
map("state", projection="albers", parameters=c(25,40))
map("world2Hires", "USA:Alaska", projection="albers", parameters=c(55, 70))
map("world2Hires", "Hawaii", projection="albers", parameters=c(15, 25))
This needs the mapdata package for world2Hires, and (I think) the
mapproj package for the Albers projections.
Duncan Murdoch
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