[OSM-talk] administrative boundaries and is_in

[Lukasz Stelmach]

Robin Paulson wrote:
> can someone explain a few things about the way boundaries work, and
> their relation to the is_in key?
> 
> as far as i can tell, when a location (say the suburb of balham, in
> london) is added to the map, the is_in tag needs to be set, multiple
> times. in this case, it would be set as follows:
> 
> is_in:Westminster (...i think)
> is_in:greater london
> is_in:england
> is_in:united_kingdom
> is_in:British_Isles
> is_in:Great_Britain
> is_in:Europe
> ...etc.
> 
> which seems counter-intuitive, not to mention requiring huge amounts
> of work. do we set this for every item - roads, churches,
> supermarkets,....thousands of other items?

What I do is putting is_in only on places and I do it rather like
this: Westminster,greater london,england,united_kingdom,etc. Even
when I map a few villages in an areay JOSM autocompletes that.


> my second, related, point concerns boundaries that coincide with
> coastlines: do we need to trace over the coastline of a
> country/city/suburb to define an unbroken loop for each administrative
> areas, 

After reading
http://wiki.openstreetmap.org/index.php/Key:boundary
http://wiki.openstreetmap.org/index.php/Talk:Key:boundary#Expanded_usage
I would not bother.

What is more important to me, and this is question for all who know,
how to cope boundaries *between* two areas, like administrative
ones? How to cope with boundaries of different administrative
levels? If a line is a boundary between communes it is also a
boundry of respective provinces.

Both webpages above seem to be quite vague about it, or at best
unofficial.

-- 
Było mi bardzo miło.               Czwarta pospolita klęska, [...]
  >Łukasz<                 Już nie katolicka lecz złodziejska.  (c)PP




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