Sounds like I found the 0.2 already
SOme guys locate the top of the top, some guys locate the bottom of the pipe. 3' is a little excessive, but very few pins are flush around here, even on residential lots. They usually stick up a foot or so.
Dave
not necessarily but sometimes there is only a monument every 1/2 mile and it is a rough hike back to the truck just to retrieve the prism pole.
We don't force center but I do set up the instrument on tripod already set over the next traverse point ahead.
On smaller projects with a lot of monuments to locate then we do use the prism pole more for that.
Dave
When I run the rod thru the woods, I carry a tripod w/prism setup and mini prism and plumb bob.
Sounds like I found the 0.2 already
> SOme guys locate the top of the top, some guys locate the bottom of the pipe. 3' is a little excessive, but very few pins are flush around here, even on residential lots. They usually stick up a foot or so.
Now that you have found the 0.20', help me find the 2.00'. Maybe the stake was 3.00' long and battered over 2.00' and he shot the top:-)
Ralph
Ralph
Sounds like you just have to decide whether the 2 foot off pin placement is original or whether it has legs. Does the 2' make a big difference as far as lot development goes? Like does it put any houses or drives over the setbacks?
Sounds like I found the 0.2 already
One time I found a centerline pipe. There was a Survey on file which showed it a foot off. What you see is the top of a pipe which looks beat up square in a little chisel hole.
So I look at it on my hands and knees in the middle of the street because it looks funny to me. I keep chiseling and digging and soon find myself following a horizontal pipe to where it bent 90 degrees down into the ground. It actually was pretty close for the 1939 subdivision, about a tenth or so.
Some people's survey crews don't take time to investigate these pipes that were hit decades ago and bent over.
Sounds like I found the 0.2 already
we always set our pins so that the top-center is the corner.sometimes you have to drive it in at an angle if you hit a subsurface rock or ledge. so the first thing we do is try and determine if the pins we find were set tipped or pushed over or bent (hit by a mower etc).if we can't tell we shoot the top and the base. we always "double" pins, bounds etc. we use a dist-a-line (mini prism with a plumb bob and target). if you use a prism pole you need to be vigilant in keeping the level bubble in adjustment. in the case of a pin that's tipped, when we get the data back to the office we compare the base and the top to the record and make our decision as to where the corner belongs.
dave i like your described method
To be controlling a found monuments has to meet certain requirements. One of which is to be undisturbed and in its original position. It does not matter where you take your measurements as long as you provide a record of them in your notes and plats. "Found 2" iron pipe open appears disturbed, bent as it exits ground leaning southwest 0.4' out of plumb located top center of pipe, 1' above ground." I would suggest that whatever method you select that you select one that you are able to repeat.
I would suggest that with a more precise method as outlined by "Dave the Killer K Karoly" that he has a better assessment of his error as compared to the record than someone using a sloppy haphazard method. Dave can PROVE his measurement opinion, you with your single rod shot cannot, simply not enough evidence.
Is boundary surveying important? If it is, Then ought we to use methods that are commensurate with the importance of that service.
Brown state that the surveyor's obligation to the public is to provide a quality product regardless of the price.
dave i like your described method
> To be controlling a found monuments has to meet certain requirements. One of which is to be undisturbed and in its original position. It does not matter where you take your measurements as long as you provide a record of them in your notes and plats. "Found 2" iron pipe open appears disturbed, bent as it exits ground leaning southwest 0.4' out of plumb located top center of pipe, 1' above ground." I would suggest that whatever method you select that you select one that you are able to repeat.
>
> I would suggest that with a more precise method as outlined by "Dave the Killer K Karoly" that he has a better assessment of his error as compared to the record than someone using a sloppy haphazard method. Dave can PROVE his measurement opinion, you with your single rod shot cannot, simply not enough evidence.
>
> Is boundary surveying important? If it is, Then ought we to use methods that are commensurate with the importance of that service.
>
> Brown state that the surveyor's obligation to the public is to provide a quality product regardless of the price.
:good:
dave i like your described method
>Dave can PROVE his measurement opinion, you with your single rod shot cannot, simply not enough evidence.
The only thing Dave could prove is he made a few shots. What he cannot prove is that he was using the correct back sight, index, prism mode (if using a reflectorless) was right..etc etc.
10 shots to a bad spot are 10 wrong shots.
One shot is enough if you have all your ducks in a row before you take the shot.
dave i like your described method
Paul-you tell me! 😉
I try to get redundancy but sometimes the stinkin' trees get in the way and they won't let me cut them down.
dave i like your described method
What's the difference between 1 and 2 shots? 10-15 seconds maybe?
Ralph
dave i like your described method
When I say redundancy, I mean observations from different control points.
Closing the horizon or using two different BSs is reasonable in some circumstances.
dave i like your described method
> When I say redundancy, I mean observations from different control points.
>
> Closing the horizon or using two different BSs is reasonable in some circumstances.
I think I know what you mean, I don't do conventional closed traverses. I radiate every thing, using the multiple sideshot routine. So in essence I'm traversing and locating at the same setup, once I pick up I re-shoot what I want to analyze and I repeat the process. The only caveat is that when you upload to Star*Net you have to change the "SS" to "M" or else you'll get multiple coordinates to the same point.
It sounds like overkill, but it takes as long as it takes for me to walk to the point with my bi-pod.
Ralph
dave i like your described method
That is what we do, generally on smaller or open parcels.
In the timberland where the lines are 1/2 or 1/4 mile long a closed traverse is more practical but I will traverse through the middle usually following a road or something like that.
I also use GPS where practical to get more redundant ties.
