Dear Dan, my sincere apologies for the late reply, I someone didn't get a notification of your answer. I have attached an ArcScene image of the situation. This is the situation of the artefact layer after trampling in relation to an arbitrary horizontal plane. For the angle calculation, I think we can treat the three observation as one (to get the vector of the plane created through the three measurements and calculate the angle between these two planes). I think we need to treat the three observations also as one for the rotation, but I'm not sure how we can get a consistent direction of each triangle. Can we chose two observations and then calculate a vector which runs perpendicular to the line created by the first two observations through the third observation?
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