[Talk-us] Fwd: Postal Code Extract

Clifford Snow clifford at snowandsnow.us
Fri Aug 30 22:49:55 UTC 2013


On Fri, Aug 30, 2013 at 3:12 PM, John F. Eldredge <john at jfeldredge.com>wrote:

> You may want to double-check with the Post Office, to find out whether
> there is the possibility that there may legitimately be outliers in some
> cases. I don't think the US Post Office guarantees that zip codes will
> always define a single polygon with no outliers.


In this case, outliers are cause to investigate. If there is an outlier,
then a quick check of the address against the Post Office's database will
determine if the import has errors. If the outlier is legitimate then no
problem. I don't expect to find many. The data looked go before importing.
But more importantly, I want to make sure it was imported correctly.


-- 
Clifford

OpenStreetMap: Maps with a human touch
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