Good afternoon '6 giorni fa da Cebderby' and 'ivanbranco 3 giorni fa'.

I have seen the OSM full document of Tamigi river on the weburl https://www.openstreetmap.org/api/0.6/relation/2263653.

1) A system or a person want to follow the Thames river
2) A system or a person have the Thames river map, only
3) A system or a person don't want to damage its ship with a missing height information of a celing (eg. a bridge)
4) A system or a person don't know that there is a bridge (very important celing constraint) at latitude 51.5087227 and longitude -0.1168938 (node n7992814756)

I think that when we built a bridge we built a complex shadow section on the waterway.

Please explain and list how many "revert" action are done on the weburl https://www.openstreetmap.org for all the users.
Regards.
Piergiorgio.
