"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.
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