See example from UK: http://dev.openstreetmap.org/~steve8/borders.jpg
Border between countries England and Scotland is one way (actually probably
several ways), tagged admin_level=2.
Border between counties Cumbria and Northumberland is another way/s, tagged
admin_level=6.
Implicitly the country border is part of the collection of ways that make up
the Cumbria county border.
There is only one border there, and there only needs to be one "way".
NB: If you want polygons for areas you probably have to post-process the data
to compile them or use relations to group them.
Cheers
STEVE
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Beau Gunderson
Sent: Wed 5/28/2008 9:14 PM
To: Steve Chilton
Cc: [email protected]
Subject: Re: [OSM-talk] National borders - mapnik
Please clarify one thing:
"any border that is both a state and national border should be
tagged at the highest level (in this case national, admin_level=2)"
To me this sounds like there is just one way for the state/national
border... but...
"and the state borders will come in too, with their appropriate
style."
This sounds like there are two ways, one for the state border and one
for the national border.
This seems to make the most sense to me given the second sentence
quoted above.
Beau
On Wed, May 28, 2008 at 2:06 PM, Steve Chilton <[EMAIL PROTECTED]>
wrote:
Logically, any border that is both a state and national border
should be tagged at the highest level (in this case national, admin_level=2).
Similarly in UK any border that is both county and country
should be tagged at highest level (country, admin_level=2).
That way all the country borders will show at designated zoom
levels. When you move to a level that state (or whatever) comes in the country
border will already be there (in its appropriate style) and the state borders
will come in too, with their appropriate style.
Currently there is an /Else filter which picks up borders that
have no admin_level set, but it necessarily doesn't come in till higher zooms,
which appears to the case for your example below.
Cheers
STEVE
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Beau Gunderson
Sent: Wed 5/28/2008 8:42 PM
To: Steve Chilton
Cc: [email protected]
Subject: Re: [OSM-talk] National borders - mapnik
The US national border with Canada is all tagged with
admin_level=4, border_type=state, border=administrative... It also has the
left/right countries (at least the bit I looked at in WA did).
How should state borders that are also national borders
be tagged?
Does setting admin_level=2 fix the whole problem?
As you can see, they're not currently visible at low
zooms:
http://www.openstreetmap.org/?lat=48.83&lon=-118.46&zoom=7&layers=B00FF
Beau
On Wed, May 28, 2008 at 1:21 PM, Steve Chilton <[EMAIL
PROTECTED]> wrote:
The latest mapnik stylesheet has the National
borders moved from coming in at z10 to coming in at z7. Now zooms to z6 show
the borders as thin blue lines taken from the shape files, and then switch to
OSM data at z7 using a slightly thicker purple line.
Not all borders show, for one of two reasons -
either they are not digitised or are not tagged appropriately.
So, it would be useful if folk have a look at
their own country/area at z7.
Does in show correctly?
If not:
1 - check whether it has been digitised. If not
- is there a valid, non-copyrighted source for putting in the border alignment.
2 - check whether it is tagged
boundary=administrative, admin_level=2. If not - change the tagging to that so
that it may show.
As a reminder, admin boundaries should be tagged
for the admin_level that they are (at the highest level). Country/national
borders are always admin_level=2. Internal borders should be tagged according
to the suggested schema for that particular country. Details are on the wiki at:
http://wiki.openstreetmap.org/index.php/Key:boundary
which also explains the accepted way to tag for
the countries on either side of the border.
Cheers
STEVE
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