Albert Pundt <roadsgu...@gmail.com> writes:
> Why are townships, boroughs, towns, and cities in PA mapped with separate 
> admin levels, or at least "supposed to be" mapped that way according to that 
> page? As far as I know they're always only ever one level below county, and 
> never overlap. i.e. you never have a town in the middle of some other 
> township. There are plenty of smaller towns and villages that are 
> unincorporated and just census-designated places, but these aren't 
> administrative divisions and are mapped with boundary=census. So why should 
> the various county subdivisions get differing admin levels? Plus, from what 
> I've seen they seem to only ever be admin_level=8 anyway.

Albert:  CDPs, by wide and long-ago OSM consensus are not 
boundary=administrative, they are boundary=census, if those even get entered.  
(There are places where it makes sense to do so, like Alaska, and perhaps 
others, I reserve judgement and prefer to listen and watch).  If I must answer 
"why do we do it like this in Pennsylvania?" I will say "because OSM has 
expressed that there are admin_level values of 2, 4, 6, 8, 10 (national, state, 
county, city, neighborhood) which express themselves this way in the USA, 
Pennsylvania is no exception.

So, limiting the instant discussion to Pennsylvania, let's agree that the state 
is admin_level=4 and counties are admin_level=6.  If you disagree there, we 
should resolve that first.  I am in listening mode here.

By wide consensus, and because it works this way in a large number (perhaps 
even unanimously?) of the 20 out of 50 states in which townships exist, 
townships are a "complete" division of a county, with no "leftovers."  This 
means that Townships in Pennsylvania are admin_level=7 (because we've agreed 
that counties are admin_level=6).  Beyond that, I am in listening mode.

We now have (I repeat myself):
Pennsylvania-4, County-6, with City-8 directly subordinate to County-6,
Pennsylvania-4, County-6, Township-7, Village-8/Hamlet-8,
Pennsylvania-4, County-6, Borough/Boro-7, Town-8.

If you disagree, talk-us and I (both) now listen.  If you disagree (please 
discard talk of CDPs in this context, it is not germane), help us to craft a 
better structure in Pennsylvania than what is listed above:  I want to hear 
your proposal of what might be a better structure, you might use the same 
text-based structure that I do above.  We want to better channel what is really 
"in" Pennsylvania and how it maps to OSM's admin_level tagging.  Your input is 
important, even it is just more questions of "why do we do it this way?"

Thank you,
SteveA
California
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