Next message: Bill: "Re: dip, dip short, distance off with buildings, etc."
Interesting physics, and enjoyable banter, however...
My understanding is that terrestrial surveyors of old ( and RN surveyors of
land features)got their local horizontal datum from a highly portable
reference source, i.e. a leather bag of mercury. Exactly as the technique
for finding the position of the back garden using a paint roller tray full
of oil. In that type of situation, what's dip and near horizon refraction
got to do with anything...why not do as the oldies did and avoid the
problem...?
Michael B
55 04 N 001 27 W
