Very nice. But there's no information about what they use as a position reference. GPS with a pseudolite, maybe?[1] If you have a clear line of sight to your local reference transmitter, 1cm repeatability isn't that hard. If not, you need a much more complex system.
They're at my favorite local intersection, Industrial Rd. and Commercial St.
They're at my favorite local intersection, Industrial Rd. and Commercial St.
[1] http://gps.stanford.edu/papers/Thesis/StewartCobbThesis97.pd...