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Thornton Heath was always part of
Croydon parish, so you can't look at old maps for a parish
boundary. It may correspond to a ward or wards within the London
Borough of Croydon, if you can find a source for ward boundaries
which is unencumbered by copyright issues. But perhaps it would be
better to establish the boundaries of the post town of Thornton
Heath as recognized by the Royal Mail. I think checking hundreds
of addresses on the Royal Mail web site would potentially violate
their copyright, but Googling the same addresses and using the
results would probably be all right. Incredibly tedious though!
Steve
On 10/09/2012 22:07, David Fisher wrote:
Hi all,
I've noticed that in my area (Croydon, S London) a lot of streets
& POIs are identified by Nominatim with a nearby suburb of
Croydon (Thornton Heath) rather than with Croydon town itself.
The Nominatim/geocoding guys said this was due to nodes being used
instead of areas, and suggested I create relations to identify the
boundaries of the town and of its suburb(s). My question is: are
there any guidelines on how such areas/relations should be
defined? Political/admin boundaries don't really help. Is it a
case of just using my instinct & local knowledge? Are there
any good examples elsewhere?
My other (related) question is to do with postcodes. Some
postboxes nearby have been tagged not only with "ref=xxx"
(containing the first part of the postcode plus a reference no.)
but also "postal_code=xxx" (again containing the first part of the
postcode), meaning that, again, a lot of streets & POIs become
identified by Nominatim with this postcode (e.g. http://www.openstreetmap.org/browse/node/363996567).
Should *all* postboxes be tagged with "postal_code" in this way?
What about streets themselves? For streets, does the (first part
of the) postcode need to be displayed on the street sign for this
to be done?
Thanks,
David.
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