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Nachtspazz's Diary

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Discussion

Comment from katze_sonne on 10 May 2013 at 14:15

As far as I know, JOSM has a changeset revert plugin that lets you revert changes. Otherwise open the map in Potlatch 2, select to broken way and press “h” which pops up a “history” window :) Anyway it’s a good idea to contact Danzelot first and talk to him. Often breaking the map isn’t on purpose and once I had a similiar issue, the user didn’t even know about the problem ;)

Comment from Nachtspazz on 10 May 2013 at 15:08

I already contacted Danzelot and I am sure, it was not on purpose. I suspect it is a side-effec of iD 1.0.0 usage. I guess he tried to move around on the map and moved some nodes instead.

Comment from Danzelot on 10 May 2013 at 15:44

Hi Nachtspazz, when editing the map ID crashed on saving my changes. I’m sorry. Danzelot

Comment from Chris Baines on 10 May 2013 at 16:07

I had a try at using the JOSM reverter plugin to fix things, however its very hard to tell if its working, as the above changeset is one of many that makes “unintended” changes to the map… If you are really stuck, and have discussed this with Danzelot, I can go ahead and try to revert/fix the problem changesets.

The alternative is to manually fix the incorrect data?

Comment from Nachtspazz on 10 May 2013 at 16:33

Thanks. I will try to fix it manually. (I still have copy of the area from 2nd May. This should give me good guidance).

Comment from Chris Baines on 10 May 2013 at 17:25

Ok, for future reference, If you do see changeset(s) that in part or in full need reverting, do not attempt to manually repair the damage, as this complicates using most of the automated tools.

Comment from Nachtspazz on 10 May 2013 at 18:37

DONE.

Thanks for the hints.

Comment from Nachtspazz on 10 May 2013 at 19:31

My theory of what went wrong:

  • For some reason, way 204421772 (landuse=residential) was deleted in the iD 1.0.0 session.
  • It seems that the software deleted many nodes of that way and recreated new nodes for other ways that were using the same nodes as the deleted way.
  • The newly created nodes then were not inserted correctly into the existing ways. More precisly, the new nodes N1, N2, N3, N4 which should have been inserted sequentially in the existing way, were somehow interleaved with an old node of that way: N1-O1-N2-O1-N3-O1-N4.
  • And then, this old way (O1) was somehow moved to another position (which I cannot explain).

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