There was a school building here with the BM in the base of a flagpole.?ÿ The base remains, but everything else is gone and a guy has a shop here with an antique tractor displayed.?ÿ The tractor and associated machinery are not in good shape compared to others I've seen of similar age.
The tree to the north is problematic, but I think there is enough open sky in other directions that a long session will be ok.?ÿ I figure it can run 8 hours today.
Do you know the model/year of that old Farmall, Bill??ÿ When I was a skinny 13 year old kid, my dad had me drive one very similar to that in the hay field.?ÿ A little big for a mower.?ÿ By the end of the summer I had delts!
I got a 9-hour session on that disk.?ÿ Rapid solution pk-pk values: ellip ht 8 mm, lat 4 mm, lon 8 mm.?ÿ?ÿ So I don't think the tree hurt much.
But now I'm a bit puzzled.?ÿ There is a HARN a few miles south that has a value of EllipHt - xGeoid17B - NAVD88 = -0.683 m, which is large because the experimental geoid model is intended to correct the tilt across the country. Another HARN several miles north gives -0.728 m.?ÿ Seeing 0.045 m difference in the fit of the experimental geoid vs NAVD88 leveling over about 15 miles seemed a bit odd.?ÿ
The first one is a Reset, and the second one appears significantly tilted, both reasons to be suspicious, but I was betting the tilt was the cause.?ÿ So this session was checking which one to believe.?ÿ And my (rapid) result is -0.745, which is 0.017 m outside the range of the other two, and pointing the finger at the reset.
Thanks Bill and paden.?ÿ The Farmall that I mowed with was much bigger than the "B"s that we also use for mowing.?ÿ The one unique feature it had was brake cables that ran from each rear wheel to a flange on the front wheel assembly.?ÿ When I made 90?ø right-hand turns, I'd give the steering wheel a quick spin and the flange would pull the brake cable to the right rear wheel, which made a sharp, clean turn in the hayfield.
