[OSM-talk] National borders - mapnik

[Beau Gunderson]

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 <S.L.Chilton at mdx.ac.uk>
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: blodulv at gmail.com on behalf of Beau Gunderson
> Sent: Wed 5/28/2008 8:42 PM
> To: Steve Chilton
> Cc: talk at openstreetmap.org
> 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 <
> S.L.Chilton at mdx.ac.uk> 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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>
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>
>
>
>
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