A problem is that the inner touches the outer in the building relation.

As the road is in a 'tunnel' then there is no need to put a inner in the building. This actually works against the building as it does not have a vertical hole in it .. and that is what an inner would be a vertical hole .. not a horizontal one.

See https://tools.geofabrik.de/osmi/?view=areas&lon=144.95765&lat=-37.82244&zoom=16

Note that OSM only has 5 layers, for a 100 story building these layers have to cover lots of floors.

No,

See https://tools.geofabrik.de/osmi/?view=areas&lon=145.21591&lat=-37.73640&zoom=15

correction building=farm ... OSM equivalent now to homestead.

One building=barn to building=far (homestead) and added name ...
Source - DCS Base Map + Imagery

You have overlapping tree areas! And the relations for them ... one is broken.
Relations
Relation: 13196716 - ok
Relation: 13196716 - broken
Relation: 11798320 - ok

Hi,
This removed some boundaries from the Kosi NP. Note: the tree areas should be removed from the park boundaries... unless they really are aligned. Do not move the tree boundary when it is also used for other things.. make a new way for the tree edge and divorce it from the other things.

Bridge street has been split in order to use it for an admin boundary... I think it was used this way before this changeset.

Ok,
I'll have a look at it later and see if I can make some form of sense out of it.

Albert - start small. Use a good source and state the source under 'imagery used' ... yes you can include more than one source.
See osm.wiki/Good_changeset_comments

Hope that helps.

Can you be more specific about ht esource? Note that sources that are OK to use are listed here osm.wiki/Australian_data_catalogue#Victoria

The changes you have made mean the relation/9267544 Warrandyte State Park has 2 major errors.
Taroona Reserve and Yarra River Linear Reserve - Koornong both overe lap the State park.

Extra note: The OSM guide is 'one feature one OSM object'. Please do not add the tag natural=wood to parks etc.. trees don't usually stop at man made boundaries. This is usually done by someone mapping for the render!

Some of this is covered with trees.
The legal residential areas can be seen with the DCS Base map.. for the most part.

Both relations for the tree area and residential were incomplete.

Oh.. I'm using OSMInspector to check these routes - 2 bus routes that I added .. and some train routes that I corrected. So that is how I noticed.

I never bothered with iD, went straight to JOSM.
I did a thing on entering public transport routes - see - @Warin61/diary/45106

Hi
Part reversion to restore bus route 686. This was correct before this changset - public transport version 2.

I see no route 695 in this changeset..

Herre you again have removed the outer way in a tree relation/8217637.

See https://tools.geofabrik.de/osmi/?view=areas&lon=145.18256&lat=-37.72074&zoom=16

Hi,
Why have you made relation/8217634 (trees) have only one member - and that member has the role 'inner'.. This make no sense. The relation should have an outer to define the outside of it .. and then the role 'inner would define an area without trees.
See https://tools.geofabrik.de/osmi/?view=areas&lon=145.20309&lat=-37.71746&zoom=16
Observe the lack of trees now showing on the map.

Oh, the above would have no OSM relation for the building, just simple ways.

The real world is complex.

My simple thinking says;
bridge = over something
tunnel = through something.

So I think tunnel is better? No reason why the 'tunnel' cannot be on layer=2.

The building can be layer=0 'ground level' where ever that is for the building over all.

The building roof can be mapped as building:part=roof, layer 4 so as the tunnel has something over it. Other building:parts can be added for other levels/layers.

Think it through before you make any changes.

Err no.

The relation for the building .. err does not work.
The bridge .. layer=2 .. means it goes over the building? And then you have it as an inner in hte building relation .. clearly the building goes over the road...

Questions
Does the road remain at 'ground level'? If so then the road can be left at level=o, no bridge. The building can be raised over the road as layer=1. No relation is required.