
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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