[Talk-GB] Authorities, boundaries and admin-levels
peter.miller at itoworld.com
Sat Jun 13 10:26:44 BST 2009
On 13 Jun 2009, at 09:30, Peter Childs wrote:
> 2009/6/11 Ed Loach <ed at loach.me.uk>:
>>> And here is the current OSM guidance:-
>>> In order to tie in with NUTS and with guidance for other
>>> within OSM we might want to do the following for England
>>> and Wales would be similar but would skip some levels):-
>>> UK (admin_level=2)
>>> England/Wales/Scotland (admin_level=4)
>>> English regions (North East, East of England etc) (also
>>> as per NUTS)
>>> Ceremonial counties - where they exist (admin_level= 5)
>>> County Councils/Unitary Authorities (admin-level=6)
>>> Districts (admin-level=8) districts / London boroughs /
> Whats the simplest way of adding a boundary? I notice that Medway does
> not have one, I know ruthley where it should be, but have no idea of
> how to go about adding the relevant relation/way. I'm fine adding
> Roads and smaller stuff but the boundary stuff just throws me.
It is better to use a relation for the boundary rather than way tags
which used to be the only way to do it. Add the appropriate existing
ways (rivers/roads etc) to a new relation. You may need to split roads/
rivers where the boundary diverges. For some sections of the boundary
you will need to add new ways (where it goes across fields). I just
add a 'note=administrative boundary' tag to those ways.
The only source of data we can legally use for the boundary to by
knowledge is the NPE maps base which shows boundaries as a dotted line
if you are lucky and if they have not moved in the past 50 years. I
also check wikipedia as a cross check (http://en.wikipedia.org/wiki/File:EnglandMedway.png
) and then the official council website to see if there is general
agreement on the shape and extent.
It isn't perfect - to be perfect our democratic government will need
to persuade the OS to give its citizens the boundaries by which it is
governed. Until now lets do the best we can and when people say they
are wrong we will ask them to provide the information to correct it!
Btw, OSM and the UK Boundaries project got a mention on the Guardians
data blog yesterday.
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