[Talk-GB] Admin boundaries for unparished areas - how to handle?

Brian Prangle bprangle at gmail.com
Sat Aug 20 15:09:54 UTC 2016

My vote goes to not mapping them. They don't exist as entities
intrinsically, only as a negative relation of an existing entity

On 20 Aug 2016 1:35 p.m., "Colin Smale" <colin.smale at xs4all.nl> wrote:

> Hi everyone,
> There have been some discussions in the past couple of weeks about
> unparished areas, i.e. areas in England which are not part of any Civil
> Parish. Civil Parishes are given an administrative boundary relation with
> admin_level=10 to represent their entity as an administrative area. But the
> unparished areas are not, because by definition they are not an
> administrative entity.
> In the East Midlands Alex Kemp has been adding relations for these
> unparished areas, only distinguishable from Civil Parish relations by means
> of the value of the "designation" tag. This is contrary to our normal
> practice and feels counter-intuitive - why add an object to OSM which by
> definition does not exist?
> To an extent I can understand his rationale. Without these areas there are
> holes left in the coverage at admin_level=10, and often these areas can be
> correlated to places or former administrative entities, giving more-or-less
> obvious candidates for names in many cases. Doing this is alleged to
> improve the behaviour of Nominatim, which sometimes struggles with the
> complex structures in the UK compared to many other countries. However they
> are NOT administrative entities, and to tag them as such would be wrong.
> Words like "tagging incorrectly for the renderer" come to mind.
> So, ahow *should* they be tagged? What should be done with these
> unparished areas? Should the existing relations be reverted? Retagged to
> something else? Should we document this and encourage other admin boundary
> maintainers like me to replicate the pattern across the whole country?
> Best regards,
> Colin
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