[OSM-talk] Post code areas
frederik at remote.org
Thu Apr 1 23:34:02 BST 2010
> What are the sources for the post code areas? How often are they
> updated? How are they defined (by reference to houses, by reference to
> geographical features, by lat/lon, something else)? Will this data be
> integrated into other OSM data, or is it basically just a separate layer?
We do have post code boundaries running together with administrative
boundaries sometimes, or running along a road. In these cases I'd expect
the post code area multipolygon to use these existing OSM features
(provided they exist).
It is unclear to me how the areas have been defined; my guess is that in
innner-city areas, mostly roads have been used, and in the countryside
they probably said something like "village A has this post code, village
B has that, so let's draw a line in between". My guess is that someone,
at some time, literally drew a line and lat/lon coordinates have been
derived from that later.
There is a post code database that is officially maintained but it is
not free. The data we have is a few years old. Post codes in Germany
don't change that often, however.
Frederik Ramm ## eMail frederik at remote.org ## N49°00'09" E008°23'33"
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