[Tagging] Boundary Relations. What's a subarea used for?

[Toby Murray]

+1 from me.

I believe the whole U.S. boundary relation actually contains all the state
boundaries as subareas. I've never understood the use. I guess a couple of
times it made downloading the state relations for editing easier but I have
other ways of doing that...

Toby
On Jan 7, 2015 7:23 PM, "Dave F." <davefox at madasafish.com> wrote:

> Hi
>
> This UK county boundary (admin level = 6):
> http://www.openstreetmap.org/relation/57533#map=9/51.1854/-1.8237
>
> contains nested boundary relations (tagged with role=subarea) with
> numerically higher admin levels:
> http://www.openstreetmap.org/relation/3410643#map=13/51.3398/-2.2428
>
> Are they relevant? If so, what are they for? The wiki suggests they're
> superseded:
> http://wiki.openstreetmap.org/wiki/Relation:boundary#Relation_members
>
> To me, subarea appears to be used in a similar way to the superseded
> 'is_in' tag, For the same reasons that tag was deprecated, mathematics &
> the admin_level tag can be used to determine if one polygon is inside
> another. They seem to be purely extra baggage
>
> Am I missing something or can these nested relations be removed?
>
> Cheers
> Dave F.
>
>
>
>
>
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