[Tagging] Map maintenance with StreetComplete - Preferred tagging

Cj Malone me-osm-tagging at keepawayfromfire.co.uk
Fri Jul 24 23:12:16 UTC 2020

On Fri, 2020-07-24 at 17:48 -0500, Shawn K. Quinn wrote:
> On 7/24/20 17:20, Cj Malone wrote:
> > Alternatively if each storing when each tag has been validated is a
> > direction OSM wants to go, maybe it should be in the API. A client
> > like
> > StreetComplete could "touch" a tag to rev it's edited timestamp
> > without
> > actually changing the value.
> OSM does not store edit timestamps for individual tags, only for the
> object as a whole. Finding out when a tag was changed requires a
> review of the entire history. I had to do this once when I saw a
> clear highway=motorway_link tagged as highway=motorway, with me as
> the last user to edit that road segment. Turns out the original
> mapper was the one to make the tagging mistake, not yours truly, but
> I only found this once reviewing the history.

Yeah, that option would require a new API and work done on the OSM
server to both calculate the last time a tag was edited, serve it and
store the timestamp when "touched" or updated. But once that's done
it's done for multiple clients, not just StreetComplete.

Otherwise StreetComplete would need to use the History API one each
individual nwr and try to calculate the age of a tag.

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