I'is important to know position of the roads in a construction site.
Especially in an excavation quarry.
Especially if the change quickly.
Especially if it is a quite "vertical"site.
In the Apuanian Alps, North …
Surveying activities of unstable material on high slopes is better done from above and with a drone rather than walking on it.
A "ravaneto", in the Apuanian Alps quarries (where …