Volume surveys are built for speed. They run without ground marks, which lets us mobilise, fly and deliver within a couple of days.
That speed costs a little accuracy compared with a fully controlled survey, and we would rather show you the trade than hide it. For measuring stockpiles and earthworks quantities the difference is negligible; for checking a finished formation level it is not, and in that case we will recommend the full topographic product instead.
Method matters more than the number
Every quantity is delivered with the reference surface it was computed against, the boundary used and an uncertainty band. A volume without those things is an opinion.
Repeat surveys
Sites on a monthly cycle keep the same flight plan and the same setup, so the change from month to month reflects the ground moving rather than the survey moving.