Re: [OSM-talk] Unrepentant Vandal
Thanks everyone. I'll double-check the resurrected railway line and keep an eye on it. I am not impressed by that mapper's work, and I expect more problems in the future. The other problems I have seen are, in many cases, caused by misguided QA tools. I have had one guy remove all highway=steps because of a reported routing error. Presumably the price of free maps is eternal vigilance? Oh well, best crack on. Andrew On 07/11/2015, Andy Townsendwrote: > On 07/11/2015 10:36, Andrew Errington wrote: >> Hi all, >> >> Here is a link to a random point on a light rail system: >> http://osm.org/go/546Jvddtd--?m= >> >> Soon after it opened I travelled on it from end to end, collecting gps >> data and photos of all the station signs. There are two railway >> lines, one in each direction, and I mapped them both carefully. >> >> Recently I discovered that someone had helpfully deleted one of the >> lines and tagged the other with tracks=2. I really don't think this >> is acceptable. >> >> I found the changeset and asked the user who did it why they destroyed >> my work. They replied: >> "The OSM wiki implies that a single way with tracks=2 is the preferred >> way of showing rail lines with two tracks. This was the method used >> most in S. Korea, I was attempting to create consistency." >> >> This is not actually true (and I double-checked the wiki, just in >> case). I pointed this out but the user did not acknowledge this was a >> mistake, or offer an apology. > > I'd definitely suggest that changeset discussions are the best place to > have this sort of conversation. That way, it's visible, so that other > people can be aware of the problem (and also discussions in public > tended to be conducted with more politeness). I'm sure that they > generally believed that they were doing the right thing, but didn't > think through the implications of what they were doing on data > consumers* and other mappers. > > From looking at their edit history, which appears to be wide-ranging, I > suspect that they're a non-surveying mapper who may not actually have > been to all of the places that they've edited. > >> >> So, my question is, am I being unreasonable, or am I right to think >> this is unacceptable? How can I guard against this? > > There are a bunch of "who's been editing where" tools - one that's > especially worth mentioning is > http://wiki.openstreetmap.org/wiki/Quality_assurance#WhoDidIt which > looks for changes in an area and can provide an RSS feed. I also use > ITO's OSM Mapper http://wiki.openstreetmap.org/wiki/ITO_World#OSM_Mapper > . That works a few days in arrears, but is very useful at helping you > to visualise what has changed. > >> I have no >> problem with people improving the map by improving the data, but I am >> starting to see a lot of deletions, incorrect tagging, and generally >> shoddy work appearing, especially in Korea where I have done a lot of >> original work. > > There might be a couple of issues here. One possibility is people using > "QA tools" to identify "problems" and "fixing" them. We've had a lot of > issues in GB with this - people changing the tagging on oneway roads in > carparks incorrectly when the _real_ problem was that not all of the > roads had been mapped is one example that springs to mind. Where a QA > tool identifies a problem, it should really be a prompt to carry out a > local survey rather than apply a "remote guess" of what might be wrong. > If I spot a problem like that I'd usually add to the changeset > discussion of the original mapper, or add an OSM note or a fixme, to try > and get it looked at properly. Sometimes not of this works and there > really are no local mappers, and the problem is bad enough that a remote > fix really is needed (perhaps a newbie has broken a major road by > mistake), but it's surely best that edits are done by people who either > actually are there, or at least have been there. Previous OSM tags + > imagery don't always give a full sense of what something actually is. > > Related to this is people "correcting" tags that are "wrong". Often a > "wrong" tag is a really useful indicator that an inexperienced mapper > has been active, there are other things besides the "wrong" tag that > might been checking, and the QA report is a useful indicator of this. > Fixing the "wrong" tag removes the QA report but leaves the other data > that doesn't match the real world in OSM. > > The other possibility to people causing problems using QA tools is > actually good news - lots of new mappers! People new to OSM will get > things wrong, whichever editor they're using, and any attempt to get > them to trudge through the mire that is the current "beginners' guide" > in the wiki will cause many to stop mapping before they've even > started.**. New mappers need help and understanding rather than "you've > done it wrong!". Often asking "what are you trying to map - how can I > help?" is a good way of
Re: [OSM-talk] Unrepentant Vandal
Hi Andrew, I used Potlatch 1 to retrieve your work. (edit with Potlatch, then remove the 2 from the url) Then advanced/undelete select the way and unlock. Don't forget to save. It would indeed be better to map the road as a dual carriageway as well. Polyglot 2015-11-07 11:36 GMT+01:00 Andrew Errington: > Hi all, > > Here is a link to a random point on a light rail system: > http://osm.org/go/546Jvddtd--?m= > > Soon after it opened I travelled on it from end to end, collecting gps > data and photos of all the station signs. There are two railway > lines, one in each direction, and I mapped them both carefully. > > Recently I discovered that someone had helpfully deleted one of the > lines and tagged the other with tracks=2. I really don't think this > is acceptable. > > I found the changeset and asked the user who did it why they destroyed > my work. They replied: > "The OSM wiki implies that a single way with tracks=2 is the preferred > way of showing rail lines with two tracks. This was the method used > most in S. Korea, I was attempting to create consistency." > > This is not actually true (and I double-checked the wiki, just in > case). I pointed this out but the user did not acknowledge this was a > mistake, or offer an apology. > > So, my question is, am I being unreasonable, or am I right to think > this is unacceptable? How can I guard against this? I have no > problem with people improving the map by improving the data, but I am > starting to see a lot of deletions, incorrect tagging, and generally > shoddy work appearing, especially in Korea where I have done a lot of > original work. Do I have to set up some kind of watch on all of my > contributions and check them if someone edits them? > > Andrew > > ___ > talk mailing list > talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk > ___ talk mailing list talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Unrepentant Vandal
On 07/11/2015 10:36, Andrew Errington wrote: Hi all, Here is a link to a random point on a light rail system: http://osm.org/go/546Jvddtd--?m= Soon after it opened I travelled on it from end to end, collecting gps data and photos of all the station signs. There are two railway lines, one in each direction, and I mapped them both carefully. Recently I discovered that someone had helpfully deleted one of the lines and tagged the other with tracks=2. I really don't think this is acceptable. I found the changeset and asked the user who did it why they destroyed my work. They replied: "The OSM wiki implies that a single way with tracks=2 is the preferred way of showing rail lines with two tracks. This was the method used most in S. Korea, I was attempting to create consistency." This is not actually true (and I double-checked the wiki, just in case). I pointed this out but the user did not acknowledge this was a mistake, or offer an apology. I'd definitely suggest that changeset discussions are the best place to have this sort of conversation. That way, it's visible, so that other people can be aware of the problem (and also discussions in public tended to be conducted with more politeness). I'm sure that they generally believed that they were doing the right thing, but didn't think through the implications of what they were doing on data consumers* and other mappers. From looking at their edit history, which appears to be wide-ranging, I suspect that they're a non-surveying mapper who may not actually have been to all of the places that they've edited. So, my question is, am I being unreasonable, or am I right to think this is unacceptable? How can I guard against this? There are a bunch of "who's been editing where" tools - one that's especially worth mentioning is http://wiki.openstreetmap.org/wiki/Quality_assurance#WhoDidIt which looks for changes in an area and can provide an RSS feed. I also use ITO's OSM Mapper http://wiki.openstreetmap.org/wiki/ITO_World#OSM_Mapper . That works a few days in arrears, but is very useful at helping you to visualise what has changed. I have no problem with people improving the map by improving the data, but I am starting to see a lot of deletions, incorrect tagging, and generally shoddy work appearing, especially in Korea where I have done a lot of original work. There might be a couple of issues here. One possibility is people using "QA tools" to identify "problems" and "fixing" them. We've had a lot of issues in GB with this - people changing the tagging on oneway roads in carparks incorrectly when the _real_ problem was that not all of the roads had been mapped is one example that springs to mind. Where a QA tool identifies a problem, it should really be a prompt to carry out a local survey rather than apply a "remote guess" of what might be wrong. If I spot a problem like that I'd usually add to the changeset discussion of the original mapper, or add an OSM note or a fixme, to try and get it looked at properly. Sometimes not of this works and there really are no local mappers, and the problem is bad enough that a remote fix really is needed (perhaps a newbie has broken a major road by mistake), but it's surely best that edits are done by people who either actually are there, or at least have been there. Previous OSM tags + imagery don't always give a full sense of what something actually is. Related to this is people "correcting" tags that are "wrong". Often a "wrong" tag is a really useful indicator that an inexperienced mapper has been active, there are other things besides the "wrong" tag that might been checking, and the QA report is a useful indicator of this. Fixing the "wrong" tag removes the QA report but leaves the other data that doesn't match the real world in OSM. The other possibility to people causing problems using QA tools is actually good news - lots of new mappers! People new to OSM will get things wrong, whichever editor they're using, and any attempt to get them to trudge through the mire that is the current "beginners' guide" in the wiki will cause many to stop mapping before they've even started.**. New mappers need help and understanding rather than "you've done it wrong!". Often asking "what are you trying to map - how can I help?" is a good way of getting to the root of the problem. I'd also give new mappers a week or more to "find their feet" - I suspect that the feeling of being watched would put some off too. Do I have to set up some kind of watch on all of my contributions and check them if someone edits them? I did actually used to do this - I postprocess OSM data before using mkgmap to create a Garmin map, and one of the things that that did was to enable a list of "things edited since I last edited them" to be produced. It's not something I've looked at of late though, since most edits are perfectly valid and there are plenty of other ways
Re: [OSM-talk] Unrepentant Vandal
tracks=2, and the tags on the highway way was originally preferred if the tracks were consistently in the middle of the street To me, that single line veers implausibly from one side of the street to the other, and I'd probably be more concerned to get the highway and the tram tracks to line up properly (by whatever method). The ideal nowadays is probably to draw the tracks (and the carriageways if they are split by a pair of tram tracks) separately, but there isn't much point doing one and not the other. On Sat, Nov 7, 2015 at 10:36 AM, Andrew Erringtonwrote: > Hi all, > > Here is a link to a random point on a light rail system: > http://osm.org/go/546Jvddtd--?m= > > Soon after it opened I travelled on it from end to end, collecting gps > data and photos of all the station signs. There are two railway > lines, one in each direction, and I mapped them both carefully. > > Recently I discovered that someone had helpfully deleted one of the > lines and tagged the other with tracks=2. I really don't think this > is acceptable. > > I found the changeset and asked the user who did it why they destroyed > my work. They replied: > "The OSM wiki implies that a single way with tracks=2 is the preferred > way of showing rail lines with two tracks. This was the method used > most in S. Korea, I was attempting to create consistency." > > This is not actually true (and I double-checked the wiki, just in > case). I pointed this out but the user did not acknowledge this was a > mistake, or offer an apology. > > So, my question is, am I being unreasonable, or am I right to think > this is unacceptable? How can I guard against this? I have no > problem with people improving the map by improving the data, but I am > starting to see a lot of deletions, incorrect tagging, and generally > shoddy work appearing, especially in Korea where I have done a lot of > original work. Do I have to set up some kind of watch on all of my > contributions and check them if someone edits them? > > Andrew > > ___ > talk mailing list > talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk > ___ talk mailing list talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk