> Rich:  What are X and Y set to?  They should be the map projection 
> coorindates of the grid.  If they are latitudes and longitudes, this 
> will work for 'cyl' but not 'merc'.  For 'merc', you must convert the 
> lats and lons to x and y using
>
> x, y = mp(lon, lat)
>
> -Jeff
>

Thanks Jeff, that did the trick ... I am working with lats/longs and I 
assumed that the conversion would be automatic for some reason.

Rich

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