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[Ebe66]

@spclzd
Without further checking, just based on the filename, that would be the file I mean yes.
But, regional differences aside, this will probably indicate something was wrong with the "key/tags to keep filter".
Checking https://taginfo.openstreetmap.org/keys/shelter gives this:

With as tag =yes

So there should be loads and loads (but again, could be a regional difference)

Using this site for overpass turbo (no limits) https://maps.mail.ru/osm/tools/overpass/ I get a pretty reasonable result at first glance.
Even the clusters make sense when zooming in

A random test shows it would not fall under amenity=shelter. A bus stop as example

I wonder how it would work out in real life in your example, but it seems you know more about theme-ing than me
If I feel up to it, i'll try to add shelter=yes to my filter just to see what happens although I have a pretty good idea why it doesn't work for you.
Just for arguments sake: You probably are still using 2 filter sets/files one with tags to keep with name and one to keep without name. In that case you could be running into something that took me some time to figure out.
If a node for example with shelter=yes is kept in the no name file because it's also part of a way and the same node is also being part of the with names file because the bus stop has a name, than when these two files are merged again the info from a node is not merged but either the info from the no names OR the info from the with names file ends up in the resulting file.

 

[spclzd]

I think I figured it out...

You probably are still using 2 filter sets/files one with tags to keep with name and one to keep without name. In that case you could be running into something that took me some time to figure out.
If a node for example with shelter=yes is kept in the no name file because it's also part of a way and the same node is also being part of the with names file because the bus stop has a name, than when these two files are merged again the info from a node is not merged but either the info from the no names OR the info from the with names file ends up in the resulting file.

That was not the culprit. The tags with and without names are filtered through different sections in the same file, the tags-to-keep.json if I'm not mistaken. shelter=yes was in there just once in the section without names.

this will probably indicate something was wrong with the "key/tags to keep filter".

That was the right hint: I checked the aforementioned file again and found a missing comma. Now shelter=yes is included in the map tiles and I can display it in my theme (for now just cruiser).

But the problem with clutter in the map still remains. If you look at the bus stop Krakeelpolderweg in your vinicity for example, there are four ways (rectangular shapes) and four nodes (little circles) which have the tag shelter=yes added to them (I know that you know what ways and nodes are and what they look like in overpass, but I'm explaining this in more detail here anyway, since others are also reading). Strictly speaking, if there are eight small shelters there in reality, that may actually be the absolutely correct way to depict this in OSM. But it probably will still lead to an overlaoaded map on my Roam. I'll will give it a try and decide whether to keep it in or not.

In any case: Huge thanks for your efforts!

 

[Ebe66]

Hey @spclzd , If you where in the vicinity why didn't you come by for a beer (or 2)

I see what you mean, but it's also not a tagging error or something like that but indeed it could get busy on the screen.
It's a pity pyosmium doesn't work on windows (or actually it does but when you make a call, it never finishes)
If it worked you could have looked for other shelters etc in a radius of lets say 20-30 meters and if there were, just show 1.

 

[Ebe66]

hi @spclzd ,

Would you mind posting your latest version of your theme here and me "borrowing" some of your work? (if I ever get around to modifying my theme)