[OSM-talk] Assistance on reverting deletion of a relation

[Maarten Deen]

On 2012-06-05 09:46, Carsten Nielsen wrote:
> Can somebody explain how to revert a deleted relation to the last
> revision before the deletion ?
>
> The relation http://www.openstreetmap.org/browse/relation/157837 was
> accidentally deleted as part of a changeset containing other changes
> that should not be deleted.
>
> I now it is possible to revert a full changeset (script stuff) and
> also to revert a single way (Potlach 1) but I have no idea of how to
> revert a single relation.

Easiest method:
- use JOSM to download the last non-deleted version as URL (Open 
location, CTRL-L, url is 
<http://www.openstreetmap.org/api/0.6/relation/157837/35>)
- Open the relation in JOSM, select all element and "download selected 
incomplete members"
- make a new relation with those members.
- upload

If you want to "undelete" the existing relation:
(This is from memory. I always have to find out the exact procedure 
while doing it...)

- Download the latest non-delete version as URL (Open location, CTRL-L) 
in JOSM.
- Open the relation in JOSM, select all element and "download selected 
incomplete members"
- As a safety measure, in the relation editor: select all elements to 
the right, delete all elements and add them again (to make sure you 
don't have non-exisiting members in the relation).
- upload to JOSM
Now you'll get a conflict because you want to upload a different 
version. Resolve the conflict and upload. There might be a step here 
that I'm missing but that's because it's from memory.

Make sure you never download the relation as a whole, because JOSM will 
download the last version and that is not the version you want.

Regards,
Maarten