On 20/01/11 23:09, Richard Bullock wrote:
Please do not just add the centroid to the map. I don't see the value of
that. I am interested in the experience people gain from using this
data, for example to add postcodes to an address such as addr:postcode.
I've added a few addr:postcode to my existing addr:* house numbering.
In the vast majority of cases, I've found that the centroid itself
isn't actually a centroid in the geometric sense - but more sort of a
"median" house.
e.g. even on a curved road, the "centroid" lies at the position of one
of the houses that the postcode applies to, not at the geometric
centroid - which would be some distance away and make it very tricky
to assign post-codes to addresses.
The following seem quite common in my area;
* Short roads often have just one post code covering every address
on the street
* Slightly longer roads will often have one post code for one side
of the road, and one for the other.
* Some roads will be split into segments where each address on both
sides of the road have one postcode - then further up the road, each
will have a different one etc.
* Then there are ones with one for each side of the road - and
split into segments.
The roads mostly seem to split into segments if there is a convenient
junction splitting up the housing - but sometimes not - and this
requires a bit of educated guesswork sometimes.
What I've done in the past is created a .osm file with my particular
post-code of interest - and then added the file as a new layer in JOSM
- so I can overlay it. I would certainly be interested to use this new
site - when my postcode areas of interest have been loaded.
All very useful observations. What is your postcode area (e.g. HU) so I
can load it?
--
Cheers, Chris
user: chillly
_______________________________________________
Talk-GB mailing list
Talk-GB@openstreetmap.org
http://lists.openstreetmap.org/listinfo/talk-gb
