R help - Jul 2012 - overlay contourplot with labels over spplot with color regions?

Dear R users,

I have the following problem. I plot a SpatialPixelsDataFrame object with spplot
and I need to add a contourplot
of another spatial variable. To be more precise, I plot the 
SpatialPixelsDataFrame of the mean precipitation over Germany with coloured
regions and I want to overlay the isolines of the 500, 1000 and 1500 m height
above sea level. Of course I can plot the lines as SpatialLines using the
sp.layout argument to spplot, but so I lose the labels on the lines. And I want
the height above sea level to be labelled just as it is labelled in a contour
plot. Is it possible to achieve that with lattice?

I am still new to lattice, so I beg Your excuse in case I am asking something
trivial. I googled a lot and tried a lot of things, but none worked. I tried
with contour, it does work with Spatial objects, but unfortunately contour does
not seem work with lattice. And the lattice equivalent contourplot does not
recognise Spatial objects.

I am already out of ideas. I am looking forward to Your replies. Any suggestions
will be appreciated.

Best regards,

Martin

Martin Ivanov <tramni <at> abv.bg> writes:
> 
>  Dear R users,
> 
> I have the following problem. I plot a SpatialPixelsDataFrame object with
spplot and I need to add a contourplot
> of another spatial variable. 
...

You may find that posting to R-sig-geo will help. It would also help to include
a self-contained example, say using the built-in meuse.grid data set.

Roger
> 
> I am already out of ideas. I am looking forward to Your replies. Any
suggestions will be appreciated.
> 
> Best regards,
> 
> Martin
> 
>