Removal of way/401738944 has made relation/6026831 multipolygon public land have no outer way... making the multipolygon wrong.

So why did you remove this way?

relation/5748513 has no outer way .. one inner way .. but no outer boundary.

Relationship 6794412 taged breakwater;

only has inners. It should have at least one outer.

Ways touch one another .. not good in a multipolygon!

I have made this into a simple way.

Thanks Leon. I'll have a look at it later .. There should be a method of tagging the roof too so that they don't clash.

relation/2420705 contains a way/181488836 with the same tags - adding nothing to the map. I have removed it from the relationship.

In removing way/238014906 you have made relation/3207606 (a beach area) into a simple way .. so it is no longer an area .. so the beach is effectively no longer there.

Did you really mean to do this?

Interesting and dynamic architecture is hard to map... particularly from satellite imagery! :) Don't think any of the 2D editors handle it well. Now if we modeled the world in solid modeler? :)))
My thinking at the moment is to map it by the roof over laps .. at least that is visible from the imagery. If/when someone wants to take it from the 'ground level' they will have a starting point? Still thinking about it. Will have to look at what is in OSM, rather than just the error reports.

Over 187 camp sites manually scanned. 78 deletions .. not all camp sites but most of them. Not all 'mine'. 230 objects modified .. some 'camp_sites' to pitches as the camp site is already tagged .. again not all mine.

way/482161878 (wood) crosses itself .. a figure 8.

Ok .. found 7 that I have deleted. About half of those are mine.
Did not answer your question of how I checked for duplicates .. I think at that time I was using the OSM cycle map .. that appeared to have the best rendering of camp sites ... but it may have been slow to render new data .. thus I missed some?
I will still have to scan manually for displaced ones.

I have made some changes to Camp Coutts Scout Camp. You have a number of nodes inside the area with similar tags. I assume the nodes are individual pitches so have retagged them camp_site=pitch as per a proposed tagging scheme. I have also add an alternate name Coutts Camp from the LPI Base Map.

Humm scanning ... found 1 add the day before by you .. from Imagery .. deleted mine and add the name from the base map.
Another is displaced by 200 metres .. I'll do some more looking tomorrow (and think about the displacement).

I checked for duplicate nodes .. not certain that I did check ways (too long ago to recall) .. and probably not relations. This change set 3/8/16 so 'my' node would have been that date .. relationship dated 9/7/16 so ~ a month previous.

Humm I did a recheck some time ago on duplicates .. but again I'm not certain which things I checked.
So these duplicates you have noted ... were they only campsites? Or anything else?
Thanks for letting me know.

Relation 5607069 has no tags...
the inner looks like a residential area (bing)

But has the same tags as the outer - protected area ...

Possibly the relationship should have the protected tags, and the inner should be landuse=residential???

OK. I'm using OSM Inspector to try and get the errors down.. easier than using the error files from making a map. Once those are down I'll try using the error files again.

Hi,
By making a new node and moving the boundary by 0.2 m the OSM inspector error is removed .. very little effect in the real world. It dose create a 'gap' of 0.2 metres. .. cheating I know.

relation/4246123 is now not closed ... it was closed yesterday.... Possibly the ways you deleted were used by this way? ?? History says you were the last to touch it.

Why layer=1 for these buildings?

At the moment relationship 6592787 has 3 of these buildings .. all layer=1 ... and they over lap one another ... so in order to 'fix' the problem I'd like to understand the use of the layer tag here.

Err multipolygon 5866031 has no tags to say what it is! ... Its members also cross one another. The ways that from the multipolygon are tagged area=yes .. redundant.

I have removed the area tags, resolved the ways into a simpler system and added the tag natural=scrub to the multipolygon.

This 'meadow' incorporates buildings, and structures and trees .. not all a meadow. And the relationship is not closed now ... relationship 6287756. So I have deleted the relation.