Admin_level in Slovakia

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Hey James,
I’m not sure where the best place to post this is, but i just wanted to let you know about recent changes to the usage of the “admin_level” tag in Slovakia.

The new values are already documented in the relevant OSM wiki page. The most relevant change for CS is that cities have been moved from level 9 to level 8. But just to make sure that it’s not too simple, we have two special cases in Slovakia: the capital Bratislava (BA) and the second-largest city Košice (KE) that have their own special levels. Right now they have their city relation at level 5 and their city district relations have stayed at level 9.

I believe previously you were just using level 3 for regions and 9 for cities. This coincidentally worked thanks to the city districts of BA and KE being at the same level as other cities. But now with cities moving to level 8, BA and KE would basically end up missing. So i really hope your code allows you to define some special cases for these two without too much trouble, because there is really no avoiding it.

Also i would propose to start using level 5 for these two cities as that represents the borders of the actual cities and then if possible set up nested cities inside them using the city district borders at level 9. I believe this would better reflect reality, similar to how it’s done for big cities like Prague or Brno (no nested cities here yet) in Czechia.

Another bonus of these changes is that some city district relations that were incorrectly tagged as level 9 have also been cleaned up to level 11. There were a few of these in some cities like Banská Bystrica and so this should remove some wrongly double-counted streets (rip 170 streets for me haha).

So TL;DR what needs to be done is:

  • change cities from 9 to admin_level=8
  • handle Bratislava and Košice separatly and use admin_level=5 for them (BA, KE)
  • set up the cities that are currently in CS in place of Bratislava and Košice (actually city districts, staying at admin_level=9) as nested within them

Sorry to add more work, wish i could help somehow. Thanks a lot for your tireless work on CS.