Steve Chilton wrote: >Sent: 28 May 2008 10:01 PM >To: Beau Gunderson >Cc: [email protected] >Subject: Re: [OSM-talk] National borders - mapnik > >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.
This issue comes up with quite a lot of tags. Bus routes for instance where you have more than one route reference running along the same way. In that instance I use a "|" between each route reference, could we not do the same for admin_level data? ie add all the numbers that are relevant, because in some cases perhaps lower ones do not exist for the location. Cheers Andy > >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 > > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/cgi- >bin/mailman/listinfo/talk > > > > > > > >_______________________________________________ >talk mailing list >[email protected] >http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk > >No virus found in this incoming message. >Checked by AVG. >Version: 8.0.100 / Virus Database: 269.24.1/1470 - Release Date: 28/05/2008 >7:20 AM _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
