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Expected differences in measurements

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(@thebionicman)
Posts: 4437
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There are competing thoughts here that should be considered.

First, if measurements get me to the monument life is good. A few tenths may have been within the standard of care for the time.

The second thought is; Measurements aren't the end all but we should be able to do better with minimal effort. Dimensions in the record can become our only evidence in some cases. Why not do it right.

There is an insidious line of thinking that hurts the profession more than many realize. Many believe you can be capable of properly applying the law to boundaries OR you can measure well; but certainly not both. I am calling complete bull crap on that one..?ÿ

 
Posted : 02/12/2020 9:11 am
(@jitterboogie)
Posts: 4275
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@thebionicman

?ÿ

Agreed.

?ÿ

I'll?ÿ go one?ÿ step further (mind you I'm not licensed) and say minimum standards does not invoke minimum effort or care either.

?ÿ

?ÿ

 
Posted : 02/12/2020 9:27 am
(@holy-cow)
Posts: 25292
 

How about roughly four feet??ÿ I've worked off a certain quarter corner twice monumented with a half inch bar.?ÿ My guy calls this morning to say he has found a 5/8 bar but its about 3.4 south and a foot west of where the half inch should be.?ÿ No sounds, good or null, at my spot.?ÿ So, I go back through all my notes and find I had found the half inch based on KDOT notes and they had found and dismissed the 5/8 bar set by a specific surveyor at some time in the past but after KDOT had set the bar many years ago.?ÿ I now remember that I had one heck of a time finding the half inch back in 2015 only three months after KDOT had found it again.?ÿ Simply had to dig down through the gravel road about four inches before a signal appeared.

He also reported finding two bars at the northwest section corner about 18 inches apart, but, thanks to my references he landed on the correct bar.?ÿ That other bar was not there in 2015.?ÿ Don't know where it came from.?ÿ The bar I had used was referenced on work in 1989 and not nearly as shiny as the other one he found.

 
Posted : 02/12/2020 9:35 am
(@norman-oklahoma)
Posts: 7610
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Posted by: @thebionicman

There is an insidious line of thinking that hurts the profession more than many realize. Many believe you can be capable of properly applying the law to boundaries OR you can measure well; but certainly not both. I am calling complete bull crap on that one..?ÿ

Yea, verily brother. I suspect that many of those that will argue that thinking are capable of neither good measurement nor reliably identifying the right point.?ÿ

 
Posted : 02/12/2020 9:47 am
(@daniel-ralph)
Posts: 913
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Raise your hand if you have visited an NGS baseline in the past 12 months.?ÿ https://geodesy.noaa.gov/CBLINES/calibration.shtml ?ÿ

This is probably not the issue that the OP has but makes me wonder if anyone but me does this. The baseline at Sand Point here in Seattle gets overgrown between my visits that I have to ask for it to be cleared and they do.?ÿ?ÿ

 
Posted : 02/12/2020 10:01 am
(@jitterboogie)
Posts: 4275
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@daniel-ralph

I did a gravity loop in 2010 from the Colorado School of Mines basement to the top of Mount Evans once.?ÿ

Does that count?

 
Posted : 02/12/2020 10:18 am
(@bill93)
Posts: 9834
 
Posted by: @daniel-ralph

Washington has an amazing number in the CBL list-you have it easy.

Iowa has 2, last measured 28 years ago, and the one in the middle of the state (2 hour drive for me) has the 0 mark destroyed and no 100 ft mark.

 
Posted : 02/12/2020 11:01 am
(@bstrand)
Posts: 2272
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One sec while I start a thread about how some joker pincushioned me over .2

????

 
Posted : 02/12/2020 11:38 am
(@daniel-ralph)
Posts: 913
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@bill93 The Sand Point baseline has a unique art installation. https://en.wikipedia.org/wiki/Straight_Shot

Over the years, the park has been developed around it and hence vegetation envelops the line of sight.?ÿ

 
Posted : 02/12/2020 1:51 pm
(@david-livingstone)
Posts: 1123
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I know this kind of thing varies by area but those kind of measurements would be unheard of in my area. ?ÿA few hundredths ?ÿover a half mile? ?ÿA property corner of 0.2ƒ??. ?ÿNot going to cut it around here, more like a few feet on section and 1/4 section corners and a foot or so on lot corners. ?ÿIn my opinion you are being over critical. ?ÿI can only dream of half the surveyors doing that good of work around here.

 
Posted : 02/12/2020 2:47 pm
(@marc-anderson)
Posts: 457
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Very windy day.......

 
Posted : 02/12/2020 2:50 pm
(@bill93)
Posts: 9834
 
Posted by: @david-livingstone

Are you talking about recent subdivisions??ÿ It's quite common for older plats around here to have some self-inconsistencies and inconsistencies with monuments on the order of a foot.

But I think most recent ones are good, as the CAD-generated plats close to the expressed precision and the few replacements I've seen on them are close.

 
Posted : 02/12/2020 3:33 pm
(@david-livingstone)
Posts: 1123
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Iƒ??ve seen newer stuff that didnƒ??t check much better than 0.2ƒ??, it all depends on who did it.

 
Posted : 02/12/2020 3:45 pm
(@nate-the-surveyor)
Posts: 10522
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Stick a magnet to the top of those bars. They "come to life".

N

 
Posted : 03/12/2020 4:35 am
(@oldpacer)
Posts: 656
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?ÿ"I get 2650.04, another surveyor 2650.08, another 2650.06 feet."?ÿ I don't need another surveyor, I get 2650.04' now, 2650.08' a few years ago and 2650.06 a few years before?ÿthat.?ÿ

 
Posted : 03/12/2020 7:14 am
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