S'more: lets up the ante!
Why do I get the impression two-dimensional minds are arguing about two-dimensional projections of a three-dimensional event?
BUILDING SWISS WATCHES OUT OF PLASTIC PARTS
Was the term used by one presenter last week with regards to applying the curved line concept to resetting a n/s 1/4 corner between the adjacent section corners.
Rankin
That comes to mind too when trying to use measurements that are not as long as my finger nail!
Just because the 1/4 corner was placed on the curve, too much trouble to replace it the same way, I guess?
Oops....I misread the above statement on N-S 1/4 corners. (not on any curve)
Keith
Curved or straight shouldn't we also be arguing about the grade line. A straight line to be straight would imply that one take into account the elevation. SO, to get the marker on grade you'd in most cases (at least around here) need to dig deep or build a tower to set the corner marker. Only surveyor nerds can come up with all this.
AND, does it really matter as traditionally the next surveyor isn't going to accept your marker anyway, so what's the point about worrying whether the next guy moves it a couple tenths or a few feet?
Gene
BLM = Bureau of Land Management.
Keith
Actually...ALL "lines" (except EXACT Meridians, and the Equator) are curved to some degree or another...WHEN you are talking about connecting two points with a "line" of CONSTANT Bearing (loxodrome).
The curvature of a NEARLY North-South line is of course TRIVIAL in ANY sense of the term! Now a LONG "Grant Boundary" that bears [say] N 45 E, would have a nontrivial curvature to it (depending I suppose on how it was originally described and surveyed, AND of course, how LONG it is).
My only point is simply that, folks who are surveying at the 1 centimeter (or .1 foot) level (or at least trying to), should [at least] be CONSIDERING a correction that is ~5 centimeters (~.2 ft.), ESPECIALLY when they are "returning" data at (or about) the .01 foot threshold on their plats and plans.
Personally...I don't really care how someone else does things, UNTIL I have to retrace them.
BUT...I'm sure not going to reject a 1/4 corner for a couple of tenths!
Loyal
Loyal
This is exactly my point too:
My only point is simply that, folks who are surveying at the 1 centimeter (or .1 foot) level (or at least trying to), should [at least] be CONSIDERING a correction that is ~5 centimeters (~.2 ft.), ESPECIALLY when they are "returning" data at (or about) the .01 foot threshold on their plats and plans."
There are many posts on here where the discussion is about measuring the width of my finger nail, (my term) and yet refuse to use that precise measurement in the proper procedure.
The discussion is not about GLO surveyors and how they ran line; it is about those expert measurers now who can't see the curve or refuse to.
And I am sure there are many who are sitting back and saying, ya ya ya and not the way we do it.
Or is it that difficult to change from a plane to the curve?
Keith
Keith - N/S 1/4 corners are on E-W lines.
The speaker's context was that the BLM didn't worry about the correction until it became greater than 1/2 a link. He also noted that one of the editors of the new manual stated in discussions that he didn't bother with the correction until he was working with lines over 3 miles long.
I can understand your point regarding precision and claimed precision in measurements.
By the same token, if one surveys around a section getting 1:5000 closures and then claims to be "correcting for curvature" in the sub 0.2' arena- that's pretty much cow patty city....:-D
Keith - N/S 1/4 corners are on E-W lines.
Sorry Rankin, I was thinking of 1/4 corners on N-S lines!
Who was the speaker for this:
"The speaker's context was that the BLM didn't worry about the correction until it became greater than 1/2 a link. He also noted that one of the editors of the new manual stated in discussions that he didn't bother with the correction until he was working with lines over 3 miles long."
I guess they don't run instrument lines on the ground and correct for the curve anymore?
Maybe they are winking at the provision in the new Manual that states the east-west centerline is on a constant bearing?
I would be curious to know who said that he didn't worry about the curve until he was working with lines over 3 miles long? That is 9 links from the instrument line to the true line!!
Ya suppose they are having closures better than 1:5000?
Keith