Good Evening:
I have been trying to figure this one out but just can't make it work yet.

Is there a straightforward way to convert a grid object (such as an earthwide 
or regional long-lat grid) generated using sp into a spatial polygon object 
that I could then export as a shapefile.  I want to be able to use the maptools 
overlay function to assign locations to a grid and then color each grid area 
based upon mean or other characteristics of the locations within each grid.  I 
also want to create a shapefile with attributes from each polygon saved in the 
@data component.  Please excuse me if this is a simple problem or has been 
addressed previously by the list but I have not been able to find an answer in 
previous posts.

Joe  

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