Most data sources are copyright and cannot be used for OSM.
See osm.wiki/Australian_data_catalogue for ok sources - green ones .. others may have been applied for but waiting for responses.

There is a mailing list for ozies see https://lists.openstreetmap.org/listinfo/talk-au.

Map cluter is a rendering (map drawing) thing... us mapperrs simply enter data into the data base .. complaints about how it gets rendered/drawn .. well adding or removing data so that one render (among many) is called 'mapping for the render' and is not a good practice.

Ok.
Umm I thought Way: 980158223 was tagged as a building, but I see now it is tagged as disabled parking spaces. You have fixed this too so .. all good as far as I see (which is not far).

Hi,
Welcome to OSM
I have partially reverted this and a previous changeset of yours to restore the tree area relation/2514023.
Note relations are tricky. Take care, but keep mapping.

Hi,
Parking relation/13273938 has errors.
First the inner touches the outer .. that is not allowed.
Second the building in not present in the source imagery - Bing. And it does not look to be present in other imagery.

Next: parking_space relation/13273937 ... Please read amenity=parking_space.
Then correct the tagging on this relation, and then think about both ways with the role outer - yet one is inside the other.

Hi,

Mulitipolygon relations outer ways cannot share segments. See https://tools.geofabrik.de/osmi/?view=areas&lon=151.20936&lat=-33.91583&zoom=18
The height tag should not be used for multiple heights.

I think what your trying to do is distinguish between the 2 building parts - all part of one building but at differing heights. Please see building:part=*

I think the relation should be deleted and then the base of the building mapped with the tags for the name and the maximum height. Then the smaller part of the building mapped with the reduced height, it will get its name from the base.

Hi,
Welcome to OSM.

The Wianamatta Regional Park boundary was broken - leaving a gap. And it did not follow the DCS Base Map - you cannot rely on imagery here.

Fixed. (I hope - we'll see tomorrow when the QA tools run tonight.)
While your changeset comments are good .. the "imagery used" statement is not so good. You can edit it - don't stick to what the computer generates if it does not indicate the truth.

Hi,
There is no gate in this fence...

Hi
Building=stadium would have an open area in the middle for the sport. Use the OSM wiki - see building=stadium

I have changed this to building=sports_hall. See osm.wiki/Buildings

Hi,

Building parts do not require a multipolygon relation. In fact the relation generates errors.

See https://tools.geofabrik.de/osmi/?view=areas&lon=147.18157&lat=-9.43986&zoom=18

Please cease adding relations to building:past - it is not required.

Hi,
relation/13254274 has shared segments - see https://tools.geofabrik.de/osmi/?view=areas&lon=151.10590&lat=-34.05149&zoom=18

Note A relation is not required for this building... there is no difference in the tagging. So a simple single way around the outside will do the job.

You should fix this so you learn how. First make a simple way around the outside - tag building=yes then delete the old relation and the 3 old ways.

Problems? Leave a message here - changeset/111582956

Hi,
Welcome to OSM.
The relation/13250661 for trees in not correct. Multiplygon outer ways cannot have shared segments. See https://tools.geofabrik.de/osmi/?view=areas&lon=151.24230&lat=-33.84503&zoom=17

In this case the tree area extends well beyond what you have mapped. Don't be afraid ove overlapping things - such as trees over paths.

I have removed this relation so it will disappear from the above websit. I have replaced it with a simple way see way/986145111

Reverted.

New Way: Western Sydney International (Nancy Bird Walton) Airport (985743235) ... shares no nodes with anything else. That is sourced from Maxar Imagery. I anticipate that the true airport area may be larger.

Please make your changeset comments usefull

................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

Read osm.wiki/Good_changeset_comments

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This has substantially moved the suburban boundary for Badgerys Creek and Luddenham.

What is your source for doing that?

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I can see that the airport uses nodes from various other things .. and this may be why the changes were made .. I think a reversion is in order and the way for the airport changed to a relation so that where it uses other things it is apparent to anyone who wants to modify it that they are not oly changing the airport but also the other thing.

Hi,
The changeset comment gives no indication of what is being done nor why it is justified. Suggest you read osm.wiki/Good_changeset_comments

In this instance the change is only bicycle=designated to bicycle=yes. As this is highway=cycleway I would think designated would be the best access tag.. see
access=designated

The changeset has been reverted.

Ok .. I'll ad alt_name or some such tag.

Hi,
On the DCS Base Map Bellambi Lagoon is called Bellambi Lake... which is it .. or is it both?

Hi,
Welcome to OSM.
Would not 'Helena' and 'Niona' be names of the buildings?

Hi
If you tag a way with natural=water then renders will show water over the entire area. Even if you add a relation that says there is a hole in there..
Hint... where there is a multipolygon relation .. the outer ways should not have the tame tags as the relation.

The relation/13209360 is not being rendered as it only has an inner .. there needs to be an outer...