[Tagging] Additional sub tags for survey mark
andrew.harvey4 at gmail.com
Tue Nov 21 02:48:58 UTC 2017
On 21 November 2017 at 12:29, Warin <61sundowner at gmail.com> wrote:
> I think that triangulation points are not normally used this way? Where
> required the placement of the equipment on the exact centre of the point
> may mean that the structure needs to be disassembled.
> I'd think any triangulation point could be used this way as a bench mark
> and they may all be equipped for it?
> Might have this from one of Len Beadells' books? Or from talks with a
> past neighbour - a professional surveyor.
I'm not sure, I've only seen two types the brass disk in the footpath,
gutter, road etc. and the rock or cement pillar with a plate on top,
sometimes with a black mental circle which can be seen from a distance.
Your proposed tags provides a way to distinguish these.
> Any place can be used as an 'observation point' .. so I don't see any
> reason to map something that has no ground presence?
> Or is there some artefact left behind? And then would not that be a form
> of benchmark?
It was more that maps refer back to this observation station, but fair
point, especially since nothing on the ground to verify that. I'm not too
fussed about this.
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