[Tagging] Handle with care (was: Accuracy of survey)

[Kotya Karapetyan]

Hi André,

I agree with moltonel.

But otherwise I think there is a difference between a general warning or
message from one mapper to another (which in its own is an interesting idea
but can lead to dialogues and discussions) and a specific technical feature
that would prevent moving an accurately positioned tag.

Imagine there is a real-world marker at 50.000° N:
http://www.dieweltenbummler.de/geografisches/geografische-besonderheiten/50-breitengrad/
Someone draws it in OSM at 50° N. Then I come there with a smartphone,
measure the location, find it at 49.9° and edit the OSM accordingly. It is
wrong by definition (providing that the real-world marker location is known
precisely), but there is no mechanism to prevent such editing.

I think it's a very specific and relevant gap, and would love seeing it
solved elegantly.

Kind regards,
Kotya


On Wed, Sep 9, 2015 at 11:39 PM, moltonel <moltonel at gmail.com> wrote:

>
>
> On 9 September 2015 21:46:54 GMT+01:00, "André Pirard" <
> a.pirard.papou at gmail.com> wrote:
> >There are various reasons for warning other mappers to be careful about
> >their updates.
> >I once temporarily overlaid two walking routes to show the effect of
> >displaying two sorts of icons.
> >Or I left in for a while drawing errors of a plugin as the best way to
> >show the author what I talk about.
> >Despite a don't touch note explaining why, a good soul passes, not
> >reading note and makes a "correction".
>
> Please run experiments like this on a test db, not on the main one. It's
> easy to point your editor to dev.openstreetmap.org for example (quoting
> from memory, not 100% sure). You never know when a data consumer will
> stumble upon your experiment, live or in a downloaded snapshot. Nobody
> expects osm data to be perfect all the time, but there's no point in
> knowingly making it worse.
> --
> Vincent Dp
>
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