LiveScan3D

Related: there was a small project that done similar stuff with Kinect v2 a ~7 years ago that was really impressive for the time. https://github.com/MarekKowalski/LiveScan3D Now that Kinect v2 can be found for next to nothing and is very easy to mod to use without an expensive adaptor it's a bit of a shame the project was abandoned, from what I've seen the bigger limitations of the project can be overcome (only one Kinect per PC, mainly).

Well, we used this for local calibration: https://github.com/MarekKowalski/LiveScan3D/tree/master/docs... of course this is only to calibrate the feeds relative to each other. But coupled with GPS almost any shape could work. (Hills, landmarks, buildings.)