?ÿ
I would never adjust for some of the reasons above, but here's where it might help: If you found the 2nd and 2nd to last points and used them to look for the first/last point, the adjusted points would get you closer than the non-adjusted.?ÿ
Well, suppose you found 1 good point for the whole property. And other evidence that you would use to rotate to but not good enough to hold for a corner, the balanced deed might be the best there is. It would be better than leaving the entire error (or whatever) in the last leg.?ÿ
Also, 0.75' closure sounds like a lot to me from 0.1' and 1 minute rounding "errors". Don't you have a 0.025 RMS error for each distance and something like that for each angle on each leg. Sq. Rt of 0.025 squared x 2 x no of legs won't get you to 0.75'. Most of you know more about this than me.
If you found the 2nd and 2nd to last points and used them to look for the first/last point, the adjusted points would get you closer than the non-adjusted.?ÿ
You are right. And, if while doing this, you had to reset a missing point, it would "get you closer".
N
@nate-the-surveyor I really can't imagine being off with your calculations by one foot would make a difference in a search. Maybe if the corner is a pin?
My search areas are range between 10' and 100' + radius, so I can't imagine needing a second trip if my my numbers are revised by a foot.?ÿ
I really can't imagine being off with your calculations by one foot would make a difference in a search.
Say I've got such a search coordinate that falls near a chain link fence corner, 8 feet high, topped with razor wire. Pin finder of no use here. Junk everywhere. All gates locked. 1 foot puts me on one side of the fence or the other. No wait - it's a four way corner.?ÿ I really want to narrow down the search coordinate any way possible.?ÿ?ÿ
@aliquot?ÿ
24,25,26,27,1
27-1 is to pob
24 Is a fd pin. 25 is a fnc cor. 26 is missing. 27 is a pin.
I miss 24 and 27 from calc to fd pins east 0.10'
I can now directly stake 25 and 26, move a tenth east, and I'm done.?ÿ
If I don't adjust, they will miss by alot more, and it will be field calcs, or a return trip.?ÿ
Do you see?
Nate
@nate-the-surveyor?ÿ No, are you calling 0.1' a miss? Found monuments are almost never perfect. Won't there always be a field calculation? What's the problem with a field calculation??ÿ
the difference between one trip to the field, or 2 trips.?ÿ
I ??almost never? make only one trip.
It is ??almost always? at least two trips for me.
What's the problem with a field calculation??ÿ
When it gets complex, bent monuments, leaning pipes, road grader adjusted, and such, it's easier to analyze in the office, with a glass of tea, instead of with gnats in your ear, and such like, it's time to do it in the office. As long as it's kinda simple, in the field is fine.
I did a large job. Shared the file. It's was on ground scale. But quasi or near SPC values.?ÿ Other surveyor did his work on SPC values and scale. It took me a bit to figure out 0.10' per thousand feet. Missed 0.30' in 3000'. That level of analysis is office level evaluation.
Is it sloppy procedures, or systematical?
That results in a return trip. I'm even about to figure out where his base station was, via "scale base". I may not share more files with him, if he don't bother to learn what he's given.?ÿ
N
?ÿ
I ??almost never? make only one trip.
If I've got adjusted coords, before I go to the field, then they are just "closer" than non adjusted coords, especially if they are towards the end of the sequence, of a 30 course description. This allows a little better?ÿ evaluation to begin while I'm in the field, instead of postponing it completely to the office. Again, throwing a 1 foot misclosure into the last course is not realistic.
N
?ÿ
t's was on ground scale. But quasi or near SPC values.
Despite being standard practice by some, I think ground coordinates should not look like SPC, as well as being clearly explained in the notes.
Nearly every time I go and try and ??adjust?? my comps in the field to some old description, before I have all?ÿthe pieces to the puzzle, at the end of the day I??ll find some original undisturbed piece of evidence that throws all my carefully massaged numbers into the rubbish bin.?ÿ
@bill93?ÿ
I agree. It was one of my first projects using Locus L1 receivers.
I was experimenting. I'd run off the HARN station at hot springs airport. So, I really did have some sort of real SPC's, but, then scaled them. I really did not know what I was doing.?ÿ
Nate
Is there a legitimate reason to round numbers to the minute and tenth, assuming the work is tighter than that?
I might believe that my measurements are good to the thousandth, but since my state statute, and local custom, requires quoting distance to the hundredth that is all I might offer.?ÿ
That is the reason my LS does that I believe. I asked him about it once. I don't think it is because he believes the measurements are not better, but because he thinks that those values are more realistically repeatable, and they are acceptable to report.
Please show me 0.351 people.
You may need to talk to more forensic investigators to see pictures of that.?ÿ I would not particularly recommend seeing those pics, but I am not going to tell you how to live your life 😉
