Dear all,
I am exploring the options of plotting data using the sp package. It is,
after some trial and error, not too difficult to produce nice looking
maps combining polygon, line and grid data with spplot. One thing I
haven't been able to figure out though is the use of the argument
'formula' in the spplot.grid function. Does anyone has a good example
explaining its use?
Best regards
Paulo van Breugel
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