[R] how to image.plot a XY grid file into a lat-lon map

From: Linda Smith <lsmithingm_at_gmail.com>
Date: Wed 04 Apr 2007 - 22:53:27 GMT


Hi All,

I have a netcdf gridded file with LCC projection. I can easily use image.plot to visualize it. However, as the axises are in X,Y, not Lat and Lon, I could not add state or country maps onto it (or lat lon information). I do have a grid2d file that describes the lat and lon for each (X,Y) grid, but the lat and lon are not regularly spaced, so I could not use image.plot.

Does anyone know how to plot this type of gridded data so that country or state borders can be easily added? Thanks a lot!

Linda

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