map.xyz(): interpolation of XYZ data and projection onto a map
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I am still struggling to get a grasp of R's mapping capabilities. Part of my frustration lies in the fact that I often work on areas near the poles, which complicates interpolation across the 180 degree line. For smaller areas, interpolation can be done using the interp() function in the package akima. I have taken the results from interp and projected the image onto a map. You will need the akima, maps, and mapproj packages and the functions new.lon.lat(), earth.dist(), and pos2coord().Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.
As an example I have mapped the distance from Mecca, Saudi Arabia:
The function…
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