I'm glad to can announce my last experiment to work with Wikidata and
This list shows how many objects we have in different classes and
provide links to maps with only this specific class.
I think it's much more useful than in the past where 80% of our
coordinates were simply a "landmark".
To create this tool I used properties "is instance of" and "is
subclass of". To extract this properties it was necessary to use
Now all classes, where an object is a member, are in a numerical
array-element in the database. So with an index on this array it should
have a good performances.
Next steps are to try to bring more order inside this list and support
the community to create more "is instance of"-entries in Wikidata. (Only
30% off all objects have such an entry).
Greetings from Switzerland