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3.2260763
2011 Jul 14
1
plotting x y z data from an irregular grid
Hi,
I'm trying to plot some data (z) that is linked to lat&long coordinates
(x&y). These coordinates are not however on a regular grid. I also have some
shapefiles on which I would like to overlay the data. I can plot the
shapefiles (country/city outlines) and overplot the data, but only using
quilt.plot because I otherwise always get the error message that
'Error in