[Tagging] Estimated values for height

Martin Koppenhoefer dieterdreist at gmail.com
Mon Nov 12 10:08:14 UTC 2018


Am So., 11. Nov. 2018 um 17:11 Uhr schrieb Andy Townsend <ajt1047 at gmail.com
>:

> No, putting a source on an object is not "bad practice".  If the source
> for all of the objects in a changeset is the same then of course it
> makes sense to use a changeset tag for the source rather than repeating
> the same object tag many times, but if different objects in the
> changeset have different sources then it is extremely helpful to other
> mappers to include them.  It's not compulsory (almost nothing is in OSM)
> but it can be helpful.




it is also good practice to divide/structure your changesets according to
the sources, so that it doesn't happen you have different sources within
the same changeset, at least not deliberately (by adding source tags to the
objects).

I see lots of (for example) "source=bing" which likely imply traced by a
mapper as seen on aerial imagery from Bing (but it could also mean she
imported the object from data released by Bing, or based on a website found
through bing, etc.), and his tag is completely worthless if I don't look at
the history to see which things have been modified or added or deleted in
the changeset that introduced the tag, and I must also verify that all
edits that came later didn't change these things (and the mapper simply
kept the source tag without updating it).

Cheers,
Martin
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