Agno's BIGAGNOS modular monopod was carefully designed to meet their need. Agnos has modified the standard "Bigagnos" lightweight and versatile monopod suitable for taking overhead images of excavation sites.
The modified monopod elements are: a head with RADIUS leveling car, a kit of fixed positioning, an inclinometer, and a foot pad for stabilizing the monopod base on the ground.
It is a light weight, highly maneuverable specialty monopod that permits multiple images to be taken across the excavation site at the same elevation.
Adding an optional wired small monitor will allow you see in time real time that the monopod bracket is level. This increases precision of overlaps between image sets.