[Talk-GB] Talk-GB Digest, Vol 33, Issue 24

Phil James peerjay56 at googlemail.com
Sun Jun 14 18:45:41 BST 2009


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> Today's Topics:
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>    1. Re: Authorities, boundaries and admin-levels (Peter Childs)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 13 Jun 2009 18:41:59 +0100
> From: Peter Childs <pchilds at bcs.org>
> Subject: Re: [Talk-GB] Authorities, boundaries and admin-levels
> Cc: talk-gb at openstreetmap.org
> Message-ID:
> 	<a2de01dd0906131041l5dda4bc9h88fef7556e086b7b at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
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> 2009/6/13 Peter Miller <peter.miller at itoworld.com>:
>   
>> 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:-
>>
>> http://wiki.openstreetmap.org/wiki/Key:admin_level#admin_level
>>
>> In order to tie in with NUTS and with guidance for other
>>
>> countries
>>
>> within OSM we might want to do the following for England
>>
>> (Scotland
>>
>> 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
>>
>> admin_level=4
>>
>> 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 /
>>
>> metropolitan
>>
>> 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
>>     
>
> Given that Medway is less than 50 years old that could be a problem.....
>
>   
>   
Not necessarily - if you know from local knowledge which areas are 
included in Medway, you could use the boundaries marked on NPE to guide 
you as to where the 'new' boundary is - I've used this principle to map 
some of the 'new' (!974, FGS!) North Yorks/ Cumbria boundary, using the 
old district boundaries - might not be perfect, but if someone knows 
different...

Phil James




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