[OSM-talk] Survey points with different altitudes reported as "duplicate nodes"

[Pieren]

Hi,

In the recent days, someone in France imported tens of thousand survey
points from the national mapping agency IGN (explicitely permitted).
The problem is that many points exists physically at the same lat/lon but
different height (e.g on a building, the point has to be visible for
different points of views). The points have different descriptions,
different references and different altitudes (in the tag 'ele'). But now
they are reported as "duplicate nodes" on Matt's map:
http://matt.dev.openstreetmap.org/dupe_nodes/?zoom=6&lat=47.16277&lon=1.74968&layers=BT

So would be the best solution to fix this issue ? I see different options:
- do nothing (with the risk that a bot will fix it incorrectly in the
future)
- remove arbitrarily one of the survey points but we loose some information
- merge the points into one node and merge the tags using a separator
(sounds ugly)
- consider multiple nodes with different 'ele' as non-duplicate (and
subsequently ask Matt's script to check it).

Maybe they are other options. Any advise on this ?

Pieren
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