<div dir="ltr">Frederik's description of colored polygons made me think of the French OSM instance, which can display admin level, ie<br><a href="http://layers.openstreetmap.fr/?zoom=5&lat=39.9597&lon=-78.77311&layers=0B000FFFFFFFFFFFTFFFFFFFFFF">http://layers.openstreetmap.fr/?zoom=5&lat=39.9597&lon=-78.77311&layers=0B000FFFFFFFFFFFTFFFFFFFFFF</a><br><div><br></div><div>Regarding Native American reservations, while there "is no consensus" there are a couple alternatives to admin_level (using boundary=* instead) mentioned here: <a href="http://wiki.openstreetmap.org/wiki/United_States_admin_level#Native_American_reservations">http://wiki.openstreetmap.org/wiki/United_States_admin_level#Native_American_reservations</a><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jul 11, 2017 at 2:03 PM, Frederik Ramm <span dir="ltr"><<a href="mailto:frederik@remote.org" target="_blank">frederik@remote.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<span class=""><br>
On 07/11/2017 08:18 PM, OSM Volunteer stevea wrote:<br>
> I'm glad Adam brings up the topic of Gores, as I'm also unclear on how such "holes" get "punched into" larger (multi)polygons via tagging. For example, I am "sort-of-sure" (but not positive) that in Vermont, a "gore" (or grant, location, purchase, surplus, strip...usually the result of "leftovers" from survey errors) get a tag of admin_level=4 to accurately reflect that the governmental administration happens via state-level bureaucracy.<br>
<br>
</span>I think there might be a misunderstanding here and I would like to chip<br>
in before this gets out of hand, even if I don't have any specialist USA<br>
knowledge:<br>
<br>
If you have an admin_level 4 entity - like a state - then the boundaries<br>
with admin_level 4 are the outer demarcation of that, i.e. they separate<br>
the area where the state is responsible from the area where the state is<br>
not responsible.<br>
<br>
The only reason to have an admin level 4 boundary inside a state, would<br>
be if there was somehow a piece of *federal* territory inside the state.<br>
Only then would the state have a "hole" in it that would be tagged with<br>
admin level 4! An area inside the state that is state-governed because<br>
of a lack of admin_level 5+ entity does not need its own boundary. It is<br>
defined by the boundaries of the admin_level 5+ entities that surround it.<br>
<span class=""><br>
> without using a multipolygon relation,<br>
<br>
</span>You will be using boundary relations which are practically identical to<br>
multipolygon relations. Any attempt to create a "lower 48 states"<br>
polygon without relations would hit the 2000 node limit.<br>
<span class=""><br>
> is it correct within OSM to tag, say a very large "lower 48 states" polygon with admin_level=2 AND ALSO tag admin_level=2 on, say, a national_park inside of it<br>
<br>
</span>That would only be correct if the national park was *not* part of the<br>
lower 48 states but somehow part of another nation.<br>
<br>
I'm not 100% sure what you want to achieve but think of it like coloured<br>
polygons. If you have an admin_level 2 area for the USA, think of that<br>
as one colour, and then you have a lot of states, each with a different<br>
colour. In those areas where the "USA colour" shines through, because<br>
they're not covered by any state, that's automatically federal territory<br>
and you do *not* want an admin_level 2 boundary surrounding that<br>
(because then not even the "USA colour" would shine through, there would<br>
be nothing there).<br>
<span class=""><br>
> Guidance by knowledgable people with real answers might guide us on a number of these situations, not just "Gores" (et al) but other kinds of "hole" tagging without multipolygons.<br>
<br>
</span>If you mean not only "without multipolygons" but "without boundary<br>
relations" too then I think you should stop right here and leave it to<br>
people who can work with relations.<br>
<br>
Bye<br>
<span class="HOEnZb"><font color="#888888">Frederik<br>
<br>
--<br>
Frederik Ramm ## eMail <a href="mailto:frederik@remote.org">frederik@remote.org</a> ## N49°00'09" E008°23'33"<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
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