Louis:

>I try to merge by value the attach zip code layer to create one big 
>polygon (Just the outside boundary). However, the merge by value function 
>did not came back the way I want it. Any thought or why????

Those areas are non-topological (i.e., polygons) so the common edges could 
not be dropped.

(I sent Louis in a separate e-mail a PNG image of a Merge by Value of the 
July 2000 ZIP Code boundaries for the same ZIP Codes, using the file that 
comes with Maptitude that is topological, i.e., areas bounded by edges.)

Peter

----------------------------------------------------------------
Peter H. Van Demark
Director of GIS Products and Training        Phone: 617-527-4700
Caliper Corporation                            Fax: 617-527-5113
1172 Beacon Street                     E-mail: [EMAIL PROTECTED]
Newton MA 02461-9926            Web site: http://www.caliper.com





 
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