[R-sig-Geo] topographic maps

[Hans-Jörg Bibiko]

Dear all,

I have a tiny problem, I'd like to draw a map showing topographic  
information (like in a normal atlas) and on top of this map some  
polygons, points, etc. given by long, lat values.

I tried the geomapdata ETOPO5 in conjuction with GEOTOPO which  
actually works fine but the point is I'm dealing with maps displaying  
Eurasia and this takes really time (and memory) to plot [I also set  
GEOTOPTO's npoints to 5 bustill the same].

Then I tried to use geotiff via readOGR which also works but the same  
here, it takes too much time and I have to produce 116 maps.



Is there any elegant way to have a geo-referenced image as background  
and then to draw polygons etc. on top of it? As I said I'm dealing  
with Eurasia thus the resolution is not the big problem.

I'd be happy to get any hint.

Thanks!

--Hans