[mkgmap-dev] Commit: r1445: Hide underground railways. Map railway=abandoned to highway=track.From charlie at cferrero.net charlie at cferrero.net on Tue Dec 29 10:59:21 GMT 2009
Quoting Marko Mäkelä <marko.makela at iki.fi>: > Hi Charlie, > > On Tue, Dec 29, 2009 at 09:56:12AM +0000, charlie at cferrero.net wrote: >> Quoting svn commit <svn at mkgmap.org.uk>: >> >> > >> > Version 1445 was commited by marko on 2009-12-29 09:45:48 +0000 >> > (Tue, 29 Dec 2009) >> > >> > Hide underground railways. Map railway=abandoned to highway=track. >> >> Out of curiosity, why hide underground railways but not underground roads? > > Because, as far as I know, Garmin units do not support railway navigation. > Actually, the underground railways are now omitted from the translation > altogether; I do not know how to create invisible routeable ways. > > The reason why I committed this change is that underground railway tracks > tend to be very long and built deep underground, below roads or even > residential areas. There is a 30km long harbour tunnel near my home > (not completely mapped yet, but I already find it a little confusing to see > it on the map). Also, some time ago, I found it confusing to see subway > tracks running through a pedestrian area in the centre of Helsinki. > > Given that Garmin units do not work deep underground, omitting the > underground > railways should not hurt navigation. Railways that are visible on the ground > can be useful, especially when visiting incompletely mapped areas. > > I may create map layers for public transportation routes in the near future. > Then I will have to make sure that underground railways do appear on the > railway route layer. > > If someone knows how to create invisible routeable ways, then we might > consider hiding underground roads. I would only do that when a special > tag is set, for very long tunnels that go through cities, such as those > in Stockholm, Sweden or Brussels, Belgium. > > Best regards, > > Marko It would be good to create invisible routeable ways for places like this: http://www.openstreetmap.org/?lat=51.512189&lon=-0.117448&zoom=18&layers=B000FTF Whilst mapnik renders the Strand Underpass fine, mkgmap creates a nasty looking road going straight through the various buildings. Unfortunately I think that GPS units plot polygons first, then lines, so there's no single-layer solution at the moment. A multi-layer solution is to have: Visible layer, which does not plot highway=* & tunnel=yes Routing layer, which does. This way you don't see the tunnel roads on the map, but you can route through them. -- Charlie
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