[R-sig-Geo] plot projected xyz

[Rosa Trancoso]

Hello!

I'm having trouble making a map of terrain elevations.
I have a collection of (lon,lat, z) points. These points have regular 
spacing (20km) when projected, but not in geographical coordinates.

So I project the data and make a SpatialGRidDataFrame object with sp and 
rgdal packages.
How can I plot it with lon,lat axes? By costumizing the axes?
Is there a way to define the projection I am working on and do all the 
work with lon,lat coordinates?


Thanks in advance,
Ana Rosa