James, Seems like a bit of a mess alright. Take a look at the approved proposal for public transport which should be the standard to work towards I would think - http://wiki.openstreetmap.org/wiki/Proposed_features/Public_Transport
I attempted to apply this to Kew Gardens station a while back ( http://www.openstreetmap.org/?lat=51.47707&lon=-0.28496&zoom=17) it's not exactly straightforward, and I'm not sure how well it would work when the station is entirely underground like much of central London. Aidan On 8 March 2013 21:05, James Churchman <[email protected]> wrote: > Hi Guys > > I was originally attempting to get all the London Underground Tube > stations and Rail stations from OSM ( london xml file ) > > The issues with the data I have had are : > > 1) Some stations are tagged as Nodes, some as Ways and some as Relations > > London Bridge is large area Way: > http://www.openstreetmap.org/edit?lat=51.50426&lon=-0.084887&zoom=18 > and is tagged as a "building" of type "station" and "railway" "station" > > Westminister Tube station is tagged as a Node > http://www.openstreetmap.org/edit?lat=51.501144&lon=-0.125211&zoom=19 > of type "railway" "station" this possibly makes sense to be a Node as > its too small to be a Way.. > > Waterloo station is a Way > http://www.openstreetmap.org/edit?lat=51.503282&lon=-0.113125&zoom=18 > but this time type "building" "station" ( rather than "train_station" > as London bridge is ) ( and also "railway" "station" ) > but it's also grouped as a Relation of type "site" "railway_station" > > > > Maybe some being Nodes, Ways or Relations makes good sense, but maybe > it does not... maybe all stations should be a Node ( London Bridge has > no Nodes just a single Way ) and then station buildings should just be > buildings.. that would at least be more consistant .. the buildings > could always be put into a Relation with the Node if needed ? > > Also types of "train_station" and "station" etc... should this not be > standardised? > > > 2) Stations tagged multiple times (this is a much bigger problem) ! > > Approximately 75 % of all London Underground Tube stations are tagged > with a Node multiple times, the distribution looks like this: > > 0 times : e.g. London Bridge, this is only a Way there is no Node for > either the Rail or Tube > > 1 single time : this is the rarest case and as far as I can see the > correct case > Borough, Farringdon, St James' Park, Westminister and a few others are > the few single tagged Tube stations in London > > e.g Farringdon looks fine > http://www.openstreetmap.org/edit?mlat=51.52056&mlon=-0.10504&zoom=18 > its a single node of "railway" type "station" and has the two > "networks" correctly attributed to it of "National Rail;London > Underground". The only issue that i can see with Farringdon is as with > many other tube stations it has a additional russian name "name:ru" of > "Фаррингдон" > > > 2,3,4 or even more tages for the same station .. > > High Street Kensington : > http://www.openstreetmap.org/edit?lat=51.5008&lon=-0.19269&zoom=19 has > 4 tags .. each one joined to a rail line > > Piccadilly Circus > http://www.openstreetmap.org/edit?lat=51.510003&lon=-0.134754&zoom=18 > is tagged twice ( once under a different way ) > > Lambeth North is again tagged twice ( once under a way ) > http://www.openstreetmap.org/edit?lat=51.499021&lon=-0.112524&zoom=18 > > Oxford Circus Tube Station is not taged at all. but instead the 4 > exits are tagged singularly as type "railway" and "subway_entrance" .. > http://www.openstreetmap.org/edit?lat=51.515258&lon=-0.141406&zoom=18 > though they all do seem to be grouped into a Relation of > "public_transport" "stop_area" > Is this level of tagging required, and would an actual "station" tag > in the centre of these 4 entrances simply denoting the station itself > be better ? ---as it is no station at all is plotted on osm.org > > Green Park Tube Station is similar again with no tagged station but > many tagged entrances > > https://maps.google.co.uk/maps?client=safari&oe=UTF-8&ie=UTF-8&q=green+park&fb=1&gl=uk&hq=green+park&cid=0,0,15806140768408957347&ei=8To6UcfADM-w7AbP_oHQCA&ved=0CKwBEPwSMAA > http://www.openstreetmap.org/edit?lat=51.506934&lon=-0.142474&zoom=18 > > > Waterloo Station is tagged once as a large area Way, and then 5 > separate times as well as Nodes detonating a station > http://www.openstreetmap.org/edit?lat=51.50246&lon=-0.11246&zoom=17 > they are dotted all about the place, some on lower layers, some for > one train line or another .. > > > 3 ) Also there is the issue of networks tagging .. > Some stations are tagged as "London Underground" or "National Rail" as > they should, but some that are both a dual are tagged with two nodes > one for each rather that a single node of "National Rail;London > Underground" for example. eg Kensington Olympia is tagged twice, once > with "London Overground" and once with "National Rail;London > Underground" > > > So in conclusion the problems I have found with Rail and Tube stations are > : > a) Tagged as Ways, Nodes or Relations; sometimes all 3, sometimes just > a Node, sometimes a building Way of type "station", but no Node. > > b) Duplicated stations: sometimes an identical tagging many many many > times. Sometimes the Rail and the Tube are placed as separate stations > when they should be combined, sometimes there is a Way and also a > Node, sometimes there is a station for every Rail line/track that > comes into the actual station > > c) Stations are not taged at all, but instead the exits are all tagged > as an exit, that are sometimes grouped as a exit relation > > d) Inconsistant tagging eg some are "train_station" and others just > "station" > > ( e) odd Russian names for many of the stations ) > > > This is just from the ones I have looked at so far, I will look > further in the mean time but asking from the OSM data the position of > Rail and Tube stations in London is a very non-trivial task. Is there > something missing from my understating, or does a refurbishment of the > rail stations data for London needed? maybe something like every > station is a single node placed at the approximate center, and then > "exits" or station buildings are separately tagged and grouped into > relations a long with the original point, and that a standard > "station" and not the "railway_station" tag is chosen ? Also do these > kinds of issues exist for other cities both around the uk and the data > for the rest of the world, and is it limited to stations? > > Hope this has been helpful & can hopefully can get a discussion going > about what i am missing and what might be able to be done to help! > > Best regards > > James > > _______________________________________________ > Talk-GB mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-gb >
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