Hi,
For days now I've been trying to figure out how I could render borders
between England, Wales and Scotland using OSM data, but I keep stumbling
into same issues. Frankly, I think the way these things are tagged in UK
is a mess (I don't know what the situation is in other places):
1. Borders between these countries are tagged with the same
admin_level=4 as that of subdivisions inside England (example:
North East England, http://osm.org/go/evykef-?relation=151164).
Now I'm not a constitutional expert, but I think Wales and
Scotland represent different level of territorial division than
just a collection of England's counties. And anyway, the
http://wiki.openstreetmap.org/wiki/Tag:boundary%3Dadministrative
states level 4 is used for "England/Scotland/Wales border" and
doesn't mention anything else.
2. There is no way to render JUST land borders. Maritime borders
(territorial waters) are tagged exactly the same way as their
continental counterparts. And even if you accept this limitation
and decide to render territorial waters they are usually cut off
in the available UK OSM extracts.
3. England's coast is also tagged as a border, but Wales' and
Scotland's isn't.
Please take my criticism as a constructive one. I'm trying to use OSM
data in a real-life situation and I think borders are some of the more
important data, since they are usually visible in smaller-scale maps
(but usually _without_ marked territorial waters). The way UK's borders
are now tagged, the only way to render them usefully would be to
manually collect a list of OSM ways' IDs.
Of course I could go and edit these things myself, but since I'm not
usually covering this part of the world, I don't want to step on other
people's toes :)
Best regards,
Igor
--
http://igorbrejc.net
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