[R] Using an image background with graphics

Waichler, Scott R Scott.Waichler at pnl.gov
Mon Oct 13 23:02:55 CEST 2008

I would like to use a map or aerial photo as a background to plotting
solid lines and text, and semi-transparent color contours, in base and
lattice graphics.  Plot coordinates need to be consistent with the
georeferenced background.  For example, a color contour plot would have
an gray-toned aerial photograph as a background for overprinted
semi-transparent color contours of some spatially dependent variable.
Can anyone point me in the right direction on how to do this?

Scott Waichler
Pacific Northwest National Laboratory
scott.waichler at pnl.gov

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