[Talk-GB] Office of National Statistics data

Andy Robinson ajrlists at gmail.com
Wed Oct 31 12:30:34 GMT 2012


Ah, but we are not in the business of adding non-physical stuff just because
it makes a search work better. If we have something to add postcode data to
then that's right and proper, otherwise the postcode centroid database can
be off map and referenced from a separate database.

Cheers
Andy

> -----Original Message-----
> From: Colin Smale [mailto:colin.smale at xs4all.nl]
> Sent: 31 October 2012 12:26
> To: talk-gb at openstreetmap.org
> Subject: Re: [Talk-GB] Office of National Statistics data
> 
> > Colin, it's fine to add the postcode data to a node object (eg a poi),
> > just don't create a node with just the postcode and nothing else as
> > this is meaningless. The postcode data we have is not the information
> > for individual buildings, its just the centroid of the address polygon
> > which will contain any number of buildings (or post delivery points).
> > Thus when using the data its still necessary to do some interpretation
> > and it's not possible always to know that you are assigning the right
> > postcode to the right building/delivery point because we don't know
> > where the boundary of one postcode is against another for the same
> > street etc.
> 
> I am guessing that just having the centroid is plenty adequate for a lot
of
> reverse geocoding probably including routing, i.e. "where is XX1 3AB"
> or "take me to XX1 3AB". Obviously it won't cover questions of the form of
> "what's the postcode for this building" which will require every
individual
> building/delivery point to be tagged.
> 
> As (legal stuff permitting) "importing" the centroids would cover a very
> popular use case with (IMHO) a quality which is adequate for most people,
I
> would not be so quick to dismiss it.
> 
> Colin
> 
> 
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