I too "found the light" after following the Talk mailing list, but had already done ~8 months of tracing :-( Slowly fixing that up now. I too think that data that has no source/source:name/source:ref tags etc. is not trustworthy, but is better than nothing (because someone can now see that it needs to be verified, & goes out and does a survey).
Your example is a bit tough, I don't think there is consensus yet on how to mark up the extra details. Given that, I'd expect: source=yahoo name=blah source:name=MMBW then something like: oneway:source=knowledge traffic_calming:source=gps Smushing all sources into the one source=* tag is probably the worst way of doing it PS. It seems it's an anomaly that source:name isn't name:source, I think it was for grouping source tags when sorted alphabetically. Looking at Tagwatch, both are popular, but source:name is more so. I believe some tools handle either format. IIRK, one of the OSM founders said on Talk, source=gps is better than source=survey, as survey implies a professional survey with surveying equipment, for example from public domain government data. BTW, Potlatch has source=* shortcut keys, JOSM & Merkaartor probably do too. I don't think it's intractable problem, with crowdsourcing, good tools & leadership on "best practices" by the experienced, it's solvable. I think of source:name as a series of levels, where you can overwrite a source with a higher one: 1. source:name=image (GPS tagged photo's the best) 2. source:name=voice 3. source:name=survey (poorly named, but for a notepad etc.) 4. source:name=knowledge 5. source:name=MMBW/Collins1936 (Out-of-copyright) 6. source:name=historical I use survey, writing in my PDA's notepad application & save as PNG's on my computer as an evidence trail. I should probably use source:name=notepad to be explicit. When you think about it, almost all could be doctored (from a copyright source) except for photo's, so I think that's the ultimate goal (all street signs/POI have a corresponding GPS tagged photo of them), yep, a lot of work. Maybe I should get around to buying a GPS :-) source=* is different, since just because you tweak a few road bends from a GPS track doesn't mean it wasn't derived from Yahoo tracing. I'd suggest source=yahoo;gps in that case. Of course I'm not a copyright lawyer, but that seems to make sense to me. I can't imagine a scenario where is would be ok to change the source on a road from a government import, just because someone drove down the road wih their GPS. It still is derived from the Government data. Cheers, BlueMM --- On Sun, 18/1/09, Matt White <mattwh...@iinet.com.au> wrote: > I'm also a serial offender for not using the survey tag, but again, I > upload all my traces. > > I do a bit of yahoo tracing as well, and don't directly mark that > either... > > But then again, I don't go and screw around with any existing nodes and > ways unless I've been there... however I have been known to add the > road way in off a random trace that wasn't mine if I've been in the > area (sans name generally) and the trace quality is good enough. > > It's an intractable problem - forcing a source=survey/yahoo/made_up tag > still won't solve the issue as the source tag needs to be kept up to > date, and you can link the source tag to the individual tag within a > node (eg: the way is yahoo sourced, the name comes from the MMBW maps, > a local marked it one way through local knowledge, and someone added > speed humps using a GPS trace/waypoint setup. > > So the source tag contains a variety of sources, and no way of > determining what applies to what. > > In the end, the crowdsourcing approach *should* sort out the wheat from > the chaff eventually, but no doubt there will be some hiccups along > the way. > > Matt > > Nick Hocking wrote: > > "There is a substantial amount of data with no source tag. I'd really > > like to > > know whether it was traced or surveyed, because then I'd know whether > > to go > > down that street or not." > > > > Liz, > > > > I think there was a recent discussion about this and there was a > > school of thought that said that if there > > were public gps traces for a way then source=survey was unnecessary. > > > > I'm a serial offender for not adding source=survey tags but if the > > general consensus is that it should be added > > then I will manually add this tag to any ways that I have edited - I > > could take a while though...... > > > > I do upload public gps traces for all roads that I tag but I guess > > that this is not a guarantee that the resultant way was > > properly surveyed. E.G I have about 6 thousand miles of interstate > > traces in USA that I have stopped > > editing in because there is about to be another TIGER ravage. > > > > Eventually someone may use these traces without knowing if I was > > actually driving on the road the whole time. > > -------------------------------------------------------------------- Stay connected to the people that matter most with a smarter inbox. Take a look http://au.docs.yahoo.com/mail/smarterinbox _______________________________________________ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au