[R] get vector data from contour

Thomas Petzoldt petzoldt at rcs.urz.tu-dresden.de
Mon Feb 5 12:26:45 CET 2001

I have carried out a spatial interpolation (Kriging) using surf.gls() 

The contour plot looks very plausible and the image plot is o.k too. 
The problem is, hovever, that I need the vectorized isoplethes, as in
Unfortunately, I found no solution to get the internal data from

Is there a possibility to extract contour lines as x-y-polygon from a
grid without hacking plot3d.c?

Thank you in advance!

Thomas P.

Thomas Petzoldt
Dresden University of Technology
Institute for Hydrobiology        
mailto:petzoldt at rcs.urz.tu-dresden.de  
01062 Dresden                      http://www.tu-dresden.de/fghhihb/

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