For corners in Section 8:
S1/4-SW Cor: Record-N89å¡54Ûª29ÛW, 2739.79Ûª Measured-N89å¡54Ûª26ÛW, 2729.80Ûª
SW Cor-W1/4: Record-N00å¡56Ûª12ÛE, 2643.67Ûª Measured-N00å¡56Ûª09ÛE, 2643.65Ûª
W1/4-NW Cor: Record-N02å¡45Ûª22ÛE, 2697.43Ûª Measured-N02å¡45Ûª24ÛE, 2697.39Ûª
NW Cor-N1/4: Record-S89å¡42Ûª05ÛE, 2644.46Ûª Measured-S89å¡42Ûª04ÛE, 2644.50Ûª
These numbers are comparing an existing survey from a few years ago to one from last week, the existing survey I presume was done using RTK and the new one was also done with RTK, both surveys declared SPC bearings and ground distances.
Neither was done by my office, the new survey was by an engineer that is a client of mine. He gave me the dc file.
I cheated on the distances a bit, the first company used a DAF of 1.000294, while the engineer was using a DAF of 1.0002716423 so I changed the long one to 1.000294 and got the distances shown above.
It's amazing how tight these measurements have gotten. 🙂
It's amazing how tight these measurements have gotten.
Yes, +/-2cm positioning looks good enough at wide separations and not so slick as the separation distances shrink.
MightyMoe, post: 340318, member: 700 wrote: S1/4-SW Cor: Record-N89å¡54Ûª29ÛW, 2739.79Ûª Measured-N89å¡54Ûª26ÛW, 2729.80Ûª
First one kinda sucks...TYPO?
:angel:
yes, a typo, my typing skills are not to great 2739 is the correct footage
Kent McMillan, post: 340322, member: 3 wrote: Yes, +/-2cm positioning looks good enough at wide separations and not so slick as the separation distances shrink.
Pretty good though, if you ignore my typo.......
And it must be noted that these monuments are sans dimples B-)
Knowing how well these things can measure if handled moderately well just makes it more unforgiveable when the all too common FUBAR occurs.
Looks like +/-1cm. I'll take that any day.
I'm continually impressed by the low residuals in direction. It's a result of the difference in inversing positions (GNSS) versus angularly transferring directions (conventional traverse), but it's still amazing.
We are making it too easy for the guys retracing us 100 years from now. 😀
We could transfer all the data to hand written notes using unlined paper, then make about 100 copies of copies.
Out of curiosity, what is your opinion on the stability of the monuments, I feel like any sort of freeze/thaw would most likely cause a monument to be by a few cm's
And it must be noted that these monuments are sans dimples
Isn't that pretty much standard when there is +/-2cm s.e. noise in the positioning? Is the defense: "Well, the corner was somewhere on the (2-inch) cap, I just didn't say where"?
I wasn't out there, but these are stainless steel pipes 36" long, flared bottoms with 3" brass caps, usually they are close to flush. Frost heave isn't usually any issue, it's the random field truck that will get them.
2" cap???? That would be a lameo monument to set at a section corner, maybe if you have to drill one into a rock outcrop. 🙁
I was surprised, the distances weren't all that close till I used the same DAF, then they came together.
