[OSM-talk-be] Robot pour CP manquants à Bruxelles - A bot for missing postal codes [FR-EN]

[Sander Deryckere]

(Sorry, my French is too bad to write in a readable way, so I'll just
answer in English).

Hi Bruno,

In Belgium, we have the advantage that postal codes are mostly geographical
(with a few exceptions, like the NATO or the VRT/RTBF buildings). This is
in contrast to f.e. the UK, where postcodes are placed on streets instead
of on areas.

Most of the Belgian postcode boundaries are already complete (there are
still some holes on villages where we lack precise boundaries). And any
decent geocoder or GIS system should be able to process areas, and query
the addresses inside an area to assign the postal codes to it. Even JOSM
can select all features in an area (thanks to a plugin), and it's not a GIS
system but merely an editor.

As with other OSM data, there are multiple ways to map postal codes:
* Mapping it on every address
* Mapping it on a street-relation
* Mapping it on a boundary

And I prefer the one with the least amount of redundancy here: the boundary.

When I worked on the tool to import Agiv addresses to OSM, I specifically
put the addr:postcode and addr:city tags as optional. So the mapper can
decide whether he wants it for a certain reason or not (f.e. easier
searching while editing).

Note that Belgium isn't the only place where postcode boundaries are used,
it's used in Germany too, so tools have to support this way of mapping.

http://taginfo.openstreetmap.org/tags/boundary=postal_code#map

Regards,
Sander
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