[R-sig-Geo] mapping contours

[Jeanne Thibeault]

I'm basically a beginner with R and would like to know the best and easiest
way to add contour lines of climate data to a map. The data consists of
points of longitude and latitude with one climate variable for each point. I
was able to contour the data using akima, but that only provided me with a
rectangular grid. I would appreciate any suggestions on how to add the
contours to an existing map so that they fit appropriately.

 

Thanks,

Jeanne