Aluminum Boundary Disk in Wooden Post

[Brent George]

What do you make of the boundary marker in the image below?
- Is this common practice?
- Where exactly is the boundary position?
- Is this kosher?

and in general terms:
How should this boundary position be correctly described?
- Boundary Disk?
- Boundary Disc?
- Al. Bdy Disk in Post?
- Wooden Post with Bdy Disk?

and
Is the Boundary Mark -
- a disk?
- a post?

So many questions - so many answers....

[Alex Liggett]

Easy IMHO if this is in the rural environment. The post is the boundary mark, the position is the centre of the post. The mark should be Post x DP/SO xxxxxxx. Description - post marked with disk or similar, or maybe don't even refer to the disk.

I've never done this myself but I'm certainly aware of others who do it, especially for deer posts where the top of the post isn't visible. The accuracy tolerances for class B are built around posts as boundary marks so in theory it doesn't actually matter where you take the shot, but gsp says the centre of course.

If it's urban there will be those who argue that the disk should be the boundary mark since the accuracy tolerance is down to 0.06m, and I'd certainly be less enthusiastic about having a disk not in the centre of the post in town.

[Ian Gillespie]

I hope you can see this.
Its a disk in the top of a stone wall
Better than a peg in a stone wall which is occasionally seen.




Which is fine I guess.
Although it is a dry stone wall.
Quite a nice example too.

[Brent George]

Nov 28, 2023 19:43:57 GMT Ian Gillespie said:

I hope you can see this.
Its a disk in the top of a stone wall
Better than a peg in a stone wall which is occasionally seen.




A zoom of disk is added above.

My initial thoughts - being a dry wall - was that it would not be a sensible place to emplace a boundary marker, as any rock could be removed or moved relatively easily.  
However, looking at the lichen and moss on the dry wall structure in this case, the individual stones would appear to have been undisturbed for some time.  So why would this situation be any different than (say) a disk atop a 1.8m wooden fence post placed without concrete that twists and warps and leans in the NZ sunshine within 1-2 yrs....