Monitoring a 200 year old dry laid stone wall for movement
What is the total length involved and what is the potential loss if the wall failed completely?
Sounds like maybe there is nearby construction that requires proof that adjacent infrastructure is not damaged. Around here our walls move all by themselves, stones rolling off the top as they heave with the winter frost and spring thaws.
Good luck with your project.
I worked on something similar but it was for a coastal gun istallation from WWI. They knew it was moving, but didn't know where, by how much, or if reinforcing that had been installed had stopped the movement. We had a structural engineer identify areas of concern for different movement, installed prisims on the structure where we needed, then measured the points twice a week for a a month to get the average. We then monitored the locations every six months and reported the deviations from the original measurements. Our control was in bedrock, so was quite stable.
If I had access to a scanner at the time it would have been a superior method.