On 21 November 2017 at 12:29, Warin <61sundow...@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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