I forgot to post this link several months ago.
We utilized two reach units to derive GCPs for a UAV survey as well as to monitor the deformation at a slow-moving landslide in southwest Colorado.
All of the data, methods, and results are in the published work at the link below. It’s open access.
https://www.mdpi.com/2072-4292/11/3/265
We compared in situ gnss results to motion derived from high-resolution spaceborne radar satellites. We also compared the reach results to uav/airborne lidar surface models. It was a great project!
Austin M