[R] 3D Histograms on a Geographical Map

[Lorenzo Isella]

Dear All,
I like very much figure 2.a) and 2.b) of this paper

http://www.nature.com/srep/2013/130410/srep01640/pdf/srep01640.pdf


and I probably need a similar visualization.
Is anything like that doable in R? I have some experience with R and
gadm (gadm.org), but that is only to produce maps colored according to
a scalar.
I do not know how to visualize maps with a "perspective", let alone
adding the histograms in 3D.
Sorry for not providing an example script, but if I had one I would
not be posting at all.
Any suggestion is appreciated.
Cheers

Lorenzo