[R-sig-Geo] spplot : varying dots for multiple parameters

servet ahmet çizmeli sa.cizmeli at usherbrooke.ca
Thu Dec 17 10:43:09 CET 2009

Wow this list is awesome. I have been in lists for a longtime but never saw such
a good intentioned support in any other place.

Thanks Torleif and everyone else for taking time and producing code for me.

Torleif's code creates maps that are close to what I seek to reproduce.  The
normalization performed in the code creates a visually nice look but it
unfortunately eliminates the absolute measurement units that I need to convey in
the maps.

So the only thing that is left to achieve here is to produce different dot sizes
(and accordingly different keys) for each panel. I am right now actively
looking in this direction. Earlier in the thread, Edzer had said I could
achieve this using using xyplot but Roger had replied it is not possible so I
am a bit perplex now. I am experimenting this with a call to sp.points via
sp.layout but no luck so far :

pts <- list("sp.points", Insitu_sp, pch = 4, col = "red")
my.layout <- list(pts)
spplot(Insitu_sp, dataset, pch = 16,
         sp.layout = my.layout)

Do you people think there is a way to achieve this using either of spplot or
xyplot? If the answer is no, I'll have to stick to bubble() and populate the
different panels manually.

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