NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Estimating height of eye
From: Bruce J. Pennino
Date: 2013 Apr 11, 09:37 -0400
From: Bruce J. Pennino
Date: 2013 Apr 11, 09:37 -0400
Bruce
Others know far more than I do, see Richard's post,
but I don't believe 1 inch x/y.Even with the towers, which help a lot, I'm
thinking maybe the real/true accuracy for x/y is +/- 0.5 ft
at best. Accuracy of Z with the towers... I just don't
know. I know high end construction Caterpillar grading equipment is
computer controlled via satellites connected to the home office where the site
is coupled to Auto Cad drawings in a job file.
The operator , more or less, sits there and enjoys
the view while the computers and robots do the work. I could check, but I
suspect this is good enough for "rough " grade of a few inches at best. Who
knows about Caterpillar equipment?
But the simple truth is, who can really check
the farmer's information? You will suddenly have several "experts"
disagreeing on the coefficients in their geoids.....if you know what I
mean.....
Bruce
----- Original Message -----From: Norm GoldblattSent: Thursday, April 11, 2013 1:26 AMSubject: [NavList] Re: Estimating height of eye
Recently talking to a Canadian farmer. He has GPS on his combine. Motor attached to steering wheel. More expensive setup is a servo that drives the steering hydraulics directly- no backlash. But what really interested me is that there are stationary earth-bound tower mounted correctors spread around the farmland which can bring the accuracy to an inch.
Norm
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