I made this drawing about 8 years ago that I have used at seminars. Any surveyor who has spent time digging knows this to be very true. One of the goals in our county is to eliminate this situation at every single corner location whether it be in pavement or on gravel. We've made it standard practice to read the abstract of the monument at the corner location and clear up these problems. I think we are probably at 80% with about 2,500 corner locations. One of the most important things is to fix it BEFORE you get your GPS position on that surface location that you share with others.
4. Survey nail set in pavement where surveyor got a good "reading" from the locator.
3. Rebar that was placed over the top of the iron pipe that was assumed to be straight after only exposing the top.
2. Iron pipe that was correctly placed over the stone, but was later bent when grading took place.
1. Original government stone marking the true corner location regardless of what you find closer to the surface.
I notice there is often an offset from the peak of the signal on the surface to where the monument really is located. I'm sure this is influenced by a number of things.
The Nail Is In Line With The Magnetic Center
In using a locator one has to learn to tip and rotate it. The locator will then tell you about how the source lies below the surface.
Good explanatory picture.
Paul in PA
The Nail Is In Line With The Magnetic Center
I see what you mean. The magnetic field would be tilted to the left in this case. What we are really locating is the magnetic field, not the piece of metal below.
the nail is the corner
Because 4 subdivisions were built from it!
😉
the nail is the corner
> Because 4 subdivisions were built from it!
>
>
> 😉
No, no, no--
Every corner in those subdivisions are off
;>) 😉
So how did those convenient poker chips with numbers get buried under ground?
the nail is the corner
> Because 4 subdivisions were built from it!
>
And... the rebar is the controlling corner for the three other subdivisions and five surveys which relied upon it...
And... the top of the pipe before it was hit by the motor grader is the controlling corner for fifteen more surveys and six subdivisions which relied upon it...
And... the stone is the controlling corner for the four original homesteaders who first recovered it and relied upon it to fill out the paperwork proving their five-year occupation.
What..!?!? Anybody have a problem with that? It's called "retracement." If you want to retrace the boundaries established by RFB's four subdivisions, which corner will you use?
JBS
the nail is the corner
"If you want to retrace the boundaries established by RFB's four subdivisions, which corner will you use?"
The nail, if we are discussing lot/boundary surveys within the four subdivisions generated by the nail.
In Florida, PCP’s (permanent control points) are required by law to be placed at all R/W centerline intersections, PC’s, PCC’s etc. Again, speaking with respect to surveys within the subdivisions, I know of no surveyor that would retrace the boundary to perform an interior survey. Basically the PCP’s control the internal lots regardless of where the external boundary is.
Have a great weekend!
the nail is the corner
> PCP’s (permanent control points) are required by law
As I get older, words like permanent really crack me up. It might be there for a very long time, but nothing is permanent
> Have a great weekend!
I'm on it!
Radar
the nail is the corner
LOL!
Have a great weekend!:-)
If I was in a state where it was common place to set monuments in the center of the road...I would be active in trying to get that changed. Not a problem here.
It is not a good situation...but the actual error in the drawing shown is minimal compared to what we run into every day. I am always thrilled to find a corner within a foot.
JB
I just love your answer!
🙂
N
It all depends
on how the fences align with the nail or any of the other lower monuments.:-P
generally the center line monuments seem to have a better survival rate in urban areas especially if they are in boxes.
In rural areas it doesn't really matter as much because the monuments not in the road get lost to landscapers less often.
