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(Stranger )
01/12/07 07:01 AM
Re: Zip Code Shapes [re: tsegur]Report this article as Inappropriate to us !!!Login to Reply

It is my experience that since the late 1990s, only GDT continued to regularly produce zip code shape files with 100% coverage of zip5 zipcodes. Those provided on the Maps & Data CD/DVDs by ESRI and those we purchased from Claritas were all produced by GDT. GDT was recently purchased by TeleAtlas. The other most often encountered set of zipcodes boundaries are the ZCTA (Zip Code Tabulation Areas) of the census bureau, but 5 digit zips are discontinuous because they use 3 digit zips for public lands and extremely rural (areas without true zipcodes). Demographic estimates with geography like those provided by GeoLytics and CACI (now ESRI BIS) both begin with ZCTA geography in estimating their zipcode boundaries. The real problem is that zipcodes are not polygons, they are collections of routes which change to meet the needs of the post office and are not documented in a way that meets the needs of GIS.

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SubjectPosted byPosted on
*Zip Code Shapes tsegur   05/08/06 07:23 AM
.*Re: Zip Code Shapes alan5   11/23/09 10:58 AM
.*Re: Zip Code Shapes arthur   09/30/09 11:54 AM
.*Re: Zip Code Shapes Akin98   01/24/07 11:21 AM
.*Re: Zip Code Shapes calich   05/02/07 03:19 AM
.*Re: Zip Code Shapes lilli   01/12/07 07:01 AM
.*Re: Zip Code Shapes darrinclement   09/18/07 06:25 PM
.*Re: Zip Code Shapes rahman15   01/09/07 08:57 PM
.*Re: Zip Code Shapes - Postal Code Boundaries Sorrell   11/30/06 08:22 AM
.*Re: Zip Code Shapes scrabblehack   07/07/06 07:32 AM
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