[Tagging] Advice & clarification of the railway tracks=* tag required.
Hi A user in GB has been editing railway lines by adding tracks=4 even though each individual track has been mapped: www.openstreetmap.org/browse/way/174899570 From the railway page of the wiki: "When modeling multi-track parallel railway lines in close proximity they can either be modeled as a single way with tracks=*, or as a number of parallel ways." "The tracks=* tag should be used to record the number of tracks with a default value of 1 being assumed where this is not supplied. " In the example he's tagged each way with tracks=4. Going on what the wiki says this implies there are a total of 16 tracks on the ground. This seems incorrect tagging to me. I've contacted him directly & received a reply but he appears to think his way is correct & the wiki wrong, so I'm posting here for advice & clarification. Cheers Dave F. ___ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] Advice & clarification of the railway tracks=* tag required.
At 2012-08-07 14:56, Dave F. wrote: Hi A user in GB has been editing railway lines by adding tracks=4 even though each individual track has been mapped: www.openstreetmap.org/browse/way/174899570 From the railway page of the wiki: "When modeling multi-track parallel railway lines in close proximity they can either be modeled as a single way with tracks=*, or as a number of parallel ways." "The tracks=* tag should be used to record the number of tracks with a default value of 1 being assumed where this is not supplied. " In the example he's tagged each way with tracks=4. Going on what the wiki says this implies there are a total of 16 tracks on the ground. This seems incorrect tagging to me. I've contacted him directly & received a reply but he appears to think his way is correct & the wiki wrong, so I'm posting here for advice & clarification. The wiki is correct. This is similar to the way roads are mapped - when a road that has lanes=2 is split into two parallel one-way roads, they are each tagged lanes=1 to continue to correctly indicate the number of lanes that each way represents. Similarly, if you were to split a railway with tracks=2 into two separate parallel tracks, each would be tagged tracks=1 (or have no tracks=* tag at all, since this is documented to mean the same thing as tracks=1). -- Alan Mintz ___ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] Advice & clarification of the railway tracks=* tag required.
I guess that'll be me. The total number of tracks is a useful piece of data, whereas tracks=1 on the four individual tracks is useless. I don't really mind where the information is stored; the tracks tag looked like a sensible place to me (and indeed was already being used in this way in some places). Richard On Tue, Aug 7, 2012 at 10:56 PM, Dave F. wrote: > Hi > > A user in GB has been editing railway lines by adding tracks=4 even though > each individual track has been mapped: > > www.openstreetmap.org/browse/way/174899570 > > From the railway page of the wiki: > > "When modeling multi-track parallel railway lines in close proximity they > can either be modeled as a single way with tracks=*, or as a number of > parallel ways." > "The tracks=* tag should be used to record the number of tracks with a > default value of 1 being assumed where this is not supplied. " > > In the example he's tagged each way with tracks=4. Going on what the wiki > says this implies there are a total of 16 tracks on the ground. This seems > incorrect tagging to me. > > I've contacted him directly & received a reply but he appears to think his > way is correct & the wiki wrong, so I'm posting here for advice & > clarification. > > Cheers > Dave F. > > ___ > Tagging mailing list > Tagging@openstreetmap.org > http://lists.openstreetmap.org/listinfo/tagging > > ___ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] Advice & clarification of the railway tracks=* tag required.
On 07/08/2012 23:18, Richard Mann wrote: I guess that'll be me. The total number of tracks is a useful piece of data, In most of your edits you have the total number of tracks as they're individually mapped. whereas tracks=1 on the four individual tracks is useless. No, because as Alan & the wiki says, as multiple railways tracks are still being mapped with a single way it's used to clarify exactly how many tracks it represents. (1x4 = 4 tracks= correct; 4x4=16 tracks = incorrect) I don't really mind where the information is stored; the tracks tag looked like a sensible place to me (and indeed was already being used in this way in some places). You've appear to have grabbed the wrong end of the stick over this. If a way that represents one track has a tracks=4 tag then that is incorrect. DaveF. ___ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] Advice & clarification of the railway tracks=* tag required.
Tracks is actually mostly used in the UK to tag the total number of tracks, whether the lines have been individually mapped or not (this snapshot is a few days old): http://www.itoworld.com/map/14#lat=51.78185298480979&lon=-0.5093040346167376&zoom=7 ___ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] Advice & clarification of the railway tracks=* tag required.
On 08/08/2012 00:05, Richard Mann wrote: ...whether the lines have been individually mapped or not: You're incorrect to think this. As I've said before it's used to clarify how many tracks each way represents. http://www.itoworld.com/map/14#lat=51.78185298480979&lon=-0.5093040346167376&zoom=7 This is a useful tool as it shows us where the ways weren't tagged correctly when created, using, I suspect, the (R)eplicate key. Thanks. For example, South Wales: http://www.itoworld.com/map/14#lat=51.577855613008666&lon=-2.8221462012831355&zoom=18 This indicates a minimum of 10 tracks, whereas in reality it only has 4: Poltatch 2: http://www.openstreetmap.org/edit?lat=51.577856&lon=-2.822146&zoom=18 These inaccuracies will be added to my to do list. Cheers Dave F. ___ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] Advice & clarification of the railway tracks=* tag required.
On 2012-08-07 23:56, Dave F. wrote : Hi A user in GB has been editing railway lines by adding tracks=4 even though each individual track has been mapped: www.openstreetmap.org/browse/way/174899570 From the railway page of the wiki: "When modeling multi-track parallel railway lines in close proximity they can either be modeled as a single way with tracks=*, or as a number of parallel ways." "The tracks=* tag should be used to record the number of tracks with a default value of 1 being assumed where this is not supplied. " In the example he's tagged each way with tracks=4. Going on what the wiki says this implies there are a total of 16 tracks on the ground. This seems incorrect tagging to me. I've contacted him directly & received a reply but he appears to think his way is correct & the wiki wrong, so I'm posting here for advice & clarification. Cheers Dave F. Look at this example and ask yourself how to tag track=* on each way according to that user's concept ;-) I have found interesting to map two tracks (vs one line) to visually stress that a single track line splits in two on some distance (where trains cross like when the English drivers hand those anti-crash control sticks over). My question is: how do I include the second track in the relations containing the single line? Same question when the line is two tracks fully, of course. Now if you look at this ... isn't it tempting to map each rail? :-) One even sees where their straight line segments meet. But, last question, what's the use of mapping such "micro" details if the renderers do not show them. I have mapped cellphone aerials (man_made=tower, tower:type=communication), several on water towers like this. The water tower or other support shows, but never the aerial. Best regards, André. ___ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
