<HTML dir=ltr><HEAD><TITLE>Re: [OSM-talk] JOSM and scale</TITLE>
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<DIV dir=ltr><FONT face="Times New Roman" color=#000000 size=3>Also, returning to the scale bar issue: I was wrong, if you draw a circle in Mercator it 's more or less a circle in the real world, as long as you are in a low scale, so the scale bar in Mercator will be correct both horizontally and vertically when it s fixed-</FONT></DIV>
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<DIV>Lucas</DIV>
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<DIV><FONT face=Tahoma size=2><B>De:</B> talk-bounces@openstreetmap.org en nombre de Mark Williams<BR><B>Enviado el:</B> mié 26/03/2008 18:35<BR><B>Para:</B> Andy Robinson<BR><B>CC:</B> talk@openstreetmap.org<BR><B>Asunto:</B> Re: [OSM-talk] JOSM and scale<BR></FONT><BR></DIV></DIV>
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<P><FONT size=2>-----BEGIN PGP SIGNED MESSAGE-----<BR>Hash: SHA1<BR><BR>Andy Robinson wrote:<BR>> On 26/03/2008, Mark Williams <mark.666@blueyonder.co.uk> wrote:<BR>>> Lars Aronsson wrote:<BR>>> [some serious stuff]<BR>>><BR>>><BR>>> > Also, returning to cycle lanes, the "secondary" road<BR>>> > Malmslättsvägen is now marked with cycleway=lane, but this doesn't<BR>>> > show on the map here. And how can I indicate that this bus stop<BR>>> > is only on the southern side of the street (buses going east)?<BR>>> > Buses going in the other direction stop at another place.<BR>>> ><BR>>><BR>>> Put the bus stop off the road, on the pavement. It doesn't have to be a<BR>>> highway node as such.<BR>><BR>> Its perhaps not ideal to place the bus_stop off to the side of the<BR>> highway since the stop is part of the highway. Off to the side means<BR>> that it is more difficult to include the feature in routing and when<BR>> marking up routes on a bespoke map. However the problem of which side<BR>> of the street is real and when I started adding bus_stop's in<BR>> Birmingham I wondered too how I would do it. In the end I took the<BR>> lead from the bus stop signage itself. Here they not only have their<BR>> location (normally the name of the road they are on plus the name of a<BR>> nearby cross street or major land feature) but also "towards"<BR>> information. So I've been tagging nodes (as part of the highway) for<BR>> each stop with something like this:<BR>><BR>> highway=bus_stop<BR>> location=Birmingham Road, Driffold<BR>> towards=Sutton Coldfield<BR>> route_ref=104|104A|905|905X<BR>> shelter=true<BR>> ref=053201<BR>><BR>> I believe the "towards" should work because the place names would be<BR>> expected to be in the database (once the map is complete)<BR>><BR>> Cheers<BR>><BR>> Andy<BR><BR>I've avoided bus stuff round my part of the country as I don't use them<BR>nor really know how best to tackle this issue - maybe later...<BR><BR>IMHO this ought to be covered better by relations - at present, bus<BR>routes are being written to overlie other ways (load IOW into josm & run<BR>Validator to see an example), which is OK but adds yet more data, with<BR>duplication. The stops have been tagged off to one side - not by me -<BR>which looks pretty clear, and could easily be grouped into the No 63 bus<BR>relation. This ought to suit routing fine well. The current system<BR>doesn't look right to me.<BR><BR>In your scheme you can't tell which side it is without some pretty<BR>specialist routines to calculate your 'towards' tag. How does your<BR>hypothetical routing know the bus doesn't turn right at Driffold & take<BR>the scenic route to Sutton Coldfield via Clifton Road & the park? (OK,<BR>the lack of bus stops, but you can't rely on that as a principle).<BR><BR>I think bus stops are actually a pavement feature, for pedestrians, and<BR>live offset from the way. Your location tag says which road it belongs<BR>to, my offset says which way it goes & which side it's on. I don't see<BR>anyone suggesting post-box is a highway feature so postmen can plan<BR>routes round them :)<BR>Neither bus companies nor the mail use a live algorithm to route<BR>themselves, so I doubt the utility of all this.<BR><BR>Perhaps I'll work out one of my local routes & try it my way & see<BR>how/if it works.<BR><BR>Mark<BR>-----BEGIN PGP SIGNATURE-----<BR>Version: GnuPG v1.4.7 (GNU/Linux)<BR>Comment: Using GnuPG with Mandriva - <A href="http://enigmail.mozdev.org/">http://enigmail.mozdev.org</A><BR><BR>iD8DBQFH6olJJfMmcSPNh94RAt4mAJ45Lzzho9ZcRR77XkYonrDWIToWGgCgg2tA<BR>H0i1KoYvpRMHQzgFxdK7CoQ=<BR>=u6kA<BR>-----END PGP SIGNATURE-----<BR><BR><BR>_______________________________________________<BR>talk mailing list<BR>talk@openstreetmap.org<BR><A href="http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk">http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk</A><BR></FONT></P></DIV></BODY></HTML>