[Tagging] Tagging request: missing admin_level tags

[Christoph Hormann]

On Saturday 10 March 2018, Dave F wrote:
> If Matthijs wishes to distinguish between boundaries at sea (a good
> idea, I believe) then a *unique* tag should be added to those ways.

Note independent of the subject of this thread the tag maritime=yes - 
which is what is proposed to be used for determining the border style 
in the map - is somewhat ill defined.  There are a number of different 
types of borders that are widely tagged with this (though not all of 
them universally):

* the outer limits of the territorial waters of a country towards the 
high seas (usually 12 miles from the baseline).  This is the original 
declared purpose of maritime=yes and these are very often tagged this 
way if other boundary tags exist on the way (boundary=administrative + 
admin_level=2) - see also wambacher's illustrations - boundaries 
missing there have usually none of the tags in question.
* admin_level 2 boundaries between two countries over maritime water.  
These are usually also tagged maritime=yes.
* the outer limits of higher level administrative units towards the 
ocean - which can be either at a certain distance from the baseline 
(like in the US) or at the coastline (like in Danmark or France - 
although technically this is typically the low tide line while the 
coastline is at the high water line).  These are not universally tagged 
with maritime=yes (not commonly for example in Italy, Spain, Mexico and 
Iran).
* The US - Canada border in the Great Lakes (which is a clear misuse of 
the tag).

-- 
Christoph Hormann
http://www.imagico.de/