On Mon, Jun 1, 2015 at 12:55 AM, Marc Gemis <marc.ge...@gmail.com> wrote:
> just a few thoughts: > > What is the value of a 1 time mechanical edit cleanup ? From the moment > you ran your script, new data can arrive in the OSM with the wrong values. > Will you run your script daily ? What if a data consumer obtains the data > between 2 runs of your script ? > In my experience, two rounds of mechanical edit are sufficient. The first gets the bulk of the problem, and generally shifts the mapping behavior as well. Then maybe a few weeks later check if anyone is using the old tags and reach out to them via private message. The value of a 1 time edit is high, as long as there is sufficient consensus or apathy about the change. ------------------------------------ *The potential for data consumer impact seems highly overrated on this mailing list. *By the time something is mechanically edited data consumers have generally moved on. See also http://wiki.openstreetmap.org/wiki/Deprecated_features For example take "amenity=dog_bin". That's a minor tag, and chances are any data consumer also processes "amenity=dog_waste_bin". Thus retagging dog_bin -> dog_waste_bin would have *zero data consumer impact no matter when the script is run.* --- The tag migration is not the issue really. The problem comes in when the old tag was semantically unclear and can't be migrated. I ran into that with excrement tags actually: one set of excrement tags was used for *four distinct features* and to clean that up I had to look carefully at the context and/or ask a local mapper to verify on the ground. Fortunately the context made the right tag clear in most of the cases: but it could have been really hard.
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