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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] ZIP Code Boundaries |
| Date: |
10/17/2003 08:55:01 AM |
| From: |
Peter H. Van Demark |
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Robert:
>Something to look out for is I don't think ZCTAs cover 100% of the
>"ground". Or there are some default ZCTAs that the unaccounted for areas
>are lumped into.
ZCTAs _do_ cover all of the ground (and water). For some three-digit ZCTAs
there are a water ZCTA (e.g., 123HH) and/or a ZCTA that covers any land
blocks not in a delivery area (e.g., 123XX, or in the Caliper ZCTA
boundaries 12300 to be a number: there are 331 of these).
The ZIP Code boundaries from GDT have psuedo-ZIP Codes for non-delivery
areas (numbered under 200: there are 134 of them). That way, they also
cover all the land.
Also not that ZIP Code is a much-maligned Post Office trademark. It is "ZIP
Code" and not any other spelling, capitalization, or punctuation.
Peter
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Peter Van Demark
Director of GIS Products and Training Phone: 617-527-4700
Caliper Corporation Fax: 617-527-5113
1172 Beacon Street E-mail: peter@caliper.com
Newton MA 02461-9926 Web site: http://www.caliper.com
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