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Level?
Yep, level is necessary. In the old days of photogrammetry the mechanical equipment was super sensitive to level. They usually required a special concrete, and the machine was bolted down and leveled with super accurate calibration. It could not be moved without another tedious calibration.
Modern Photogrammetry scanners are the same way.
In Vermont we toured a granite quarry. They sold granite blocks that were ground super flat and folks like NASA, MIT would buy them for special instruments. It was accurate as a mirror on a telescope, down to nanometers.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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