Add fix for "Ways with same position" warning in Validator

[shkvorets@…]

As a result of import in Canada there are lots of ways that generate "Ways with same position" warning in JOSM.
Usually these are inner rings of a wood polygon overlapping with identical water/wetland area, or vice-versa. There are probably hundreds of thousands of these in Quebec alone. Here's one example: ​https://www.openstreetmap.org/way/664902128.

Would be easy to fix such problems by removing duplicated water area and adding water tag to inner ring of the polygon. It would make import and error correction much easier.

[zelonewolf@…]

Ways with same position example test case

[zelonewolf@…]

I've attached a simple test case that demonstrates this issue. An auto-fix should allow merging of the duplicated ways provided that there is no tag collision.

[skyper]

I fear problems with a autofix outside downloaded area as relations might not be downloaded.

[anonymous]

Perhaps limit the auto fix to cases where the relation is fully downloaded?

[GerdP]

I would agree that this could be useful if we were not talking about data from Canvec imports. IMHO it is rather useless to remove the duplicated ways as both are very likely wrong regarding the shape. Whenever I looked at this data I wondered why it was ever imported. Typical examples: way 210659483 or way 210659214.

[zelonewolf@…]

Hello - I've written a standalone utility to post-process a .OSM file to fix this exact issue. If someone is looking for a way to solve this issue, feel free to get in touch!

[skyper]

See also #8399 for a similar request.

[GerdP]

Is this problem still present in the latest Canvec data? Wouldn't it be better to fix the tool chain that produces that data?

[anonymous]

Hey Zelone I am interested! Replying to zelonewolf@…:

Hello - I've written a standalone utility to post-process a .OSM file to fix this exact issue. If someone is looking for a way to solve this issue, feel free to get in touch!