[Tagging] Accuracy of survey

Tom Pfeifer t.pfeifer at computer.org
Mon Dec 29 16:02:59 UTC 2014


Kotya Karapetyan wrote on 2014-12-29 15:27:
> Just recently I discovered that something in this direction already exists: https://wiki.openstreetmap.org/wiki/WikiProject_France/Rep%C3%A8res_G%C3%A9od%C3%A9siques#Permanence_des_rep.C3.A8res
> Example: https://www.openstreetmap.org/edit#map=23/43.42272/6.76665

Better point directly to the object you refer to:
https://www.openstreetmap.org/node/670599510

> However it seems to be France-specific. I don't know if a similar thing exists e.g. for Germany.
> Since such reference points are quite common, I would support the idea of creating a special tag for them,

Yes geodetic reference points exist, and as you see 285000 are already mapped in OSM.
And they have a tag already, man_made=survey_point
https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dsurvey_point

 > requiring that they are not moved.

But that is the same for anything in OSM. Reference points should not be moved
accidentally (there might be reasons to move them, so you cannot exclude that per se),
motorways should not be deleted accidentally. It is a general problem that OSM data
are quite vulnerable, and a single tag on a particular object will not solve this.

As for reference points, what I find useful to have a human-readable copy of the
lat/lon values in a tag, so they can be inspected more easily in case of a movement
or recreation (i.e. wiped history).

> I disagree with the point of view that an accuracy sufficient for consumer GPS devices
 > is sufficient for OSM and therefore there is no problem here.

Fine, however nobody had expressed this point of view.
You might have misread some postings.

 > Nobody ever declared that OSM is for smartphone users.

Oh, OSM _is_ for smartphone users, and any other user of course ;-)

> We are trying to map the world, and accuracy should
> be of primary interest for this project.

Sure.
Tom

>
> Cheers,
> Kotya




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