[Imports] Upload of data from the city council in Girona, Spain.

[Martin Koppenhoefer]

2017-03-30 11:14 GMT+02:00 Lluís Vicens <lluis.vicens at udg.edu>:

> As far as I know, I think there are no modifications by other mappers on
> the existing buildings from 2010 to now.
>


I find this hard to believe. We are talking about a 7 years period. If this
was true, there was no mapping comunity at all in your town. I have looked
at some occasional buildings and instantly found  buildings with different
versions, but many building modifications don't even create a new way
version (moving of their nodes!).
Looking at the area with overpass, I found 186 ways and relations with a
building:levels tag, there are also particular buildings like churches with
significant amount of versions (and a source tag by the municipality).

Clearly, removing all formerly imported buildings wholesale and readding
the new version is not something you should do in any case (hides the
history, ignores community contributions). If there was agreement that it
would be desirable as a result, the actual editing approach would still be
different: you should take the existing geometry and modify it accordingly
to account for differences compared to your new version, but still in this
case, you should not modify anything that was since modified, removed or
added by the OSM comunity, unless you perform a survey and verify that the
new version is better. You have the huge advantage that all your internal
ids for the old versions are available in OSM (if I don't misread the
"local code" tag), so conflation should be possible in all cases where no
modifications have been applied.

Cheers,
Martin
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