I am trying to draw a US map with color-coded cities superimposed on
color-coded states, showing survey results from the Behavioral Risk Factor
Surveillance System. You can see the sort of thing I'm trying to do at
http://apps.nccd.cdc.gov/gisbrfss/select_question.aspx (though I don't want all
the text).
I have the spatial data, which are a shapefile of polygons for the states, and
a shapefile of points for the cities. I can read these in and use spplot() and
the sp.layout option to get the points plotted on top of the polygons, but I
can't figure out how to get a common set of colors used for both and and a
color key drawn.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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