Same, I don't know if it's true that they are marks for Russian air strikes. But I've just tried and it does look weird (farms in the middle of the city).
It would be very suprising if those are marks for air raids. Most likely it is a troll doing it (proper troll, for "fun"). Or official psyops ofcourse to mess with peoples heads.
Spotters might very well use Google map to get coordinates but to communicate that via Google Maps itself would be strange. I don't see how fire control would not want to know what they are marking for prioritisation.
beside the large painted marks on the roofs/etc., on Ukranian TV 10 minutes ago they shown some marks which are kind of plastic stick-on 1 inch square with the same cross-in-circle image. The stick-on are reflective and have numbers. Some people think it is a mark of the houses with police, military residents, etc...
looks like it. There had some time ago been warning that some civil markers may be mistaken for suspicious one, and looks like that is what happening in this case. Sent them email about these ones.
Spotters might very well use Google map to get coordinates but to communicate that via Google Maps itself would be strange. I don't see how fire control would not want to know what they are marking for prioritisation.