Ground-based solutions simply are not as good.
It takes tripod-mounted 3D scanners a far longer time period to complete the same job. Manually needing to set up, take down, move, and set up equipment over and over again takes an incredible amount of labor. But, since drones move so quickly from place to place, and gather an uninterrupted stream of data, their speed is unmatched. Thanks to UAVs, their optical payloads, and ever-improving software options, it’s possible to have near-real-time duplication of almost any site.