[Tagging] Feature Proposal - RFC - Survey Markers

[Paul Allen]

On Sat, 5 Jun 2021 at 07:42, David Marchal via Tagging <
tagging at openstreetmap.org> wrote:

>
> How would the proposal accomodate such survey markers:
> https://commons.wikimedia.org/wiki/File:Rep%C3%A8re_g%C3%A9og%C3%A9sique_ENSG_Champs_Marne_3.jpg?uselang=fr
>

Find out how it's used (something gets inserted?) and/or the French name for
it.  Try to figure out a suitable English term.  Document it.  (I omitted
the
part about "have a long argument on the mailing list" because that is
a given and occurs at all stages of the process).

>
> These are common in France; the closer guess would be to say it is a
> plaque, but I'm a bit uncomfortable with it; I feel that a plaque implies a
> somewhat rectangular piece of metal with inscriptions on it.
>

I'm uncomfortable with that for two reasons.

1) It doesn't fit my mental image of a plaque.  Not even close.

2) What the proposal calls a plaque is called by Ordnance Survey a
bracket.  It isn't just a visual marker,  It has slots to which a small
metal
platform is attached to the two slots at the top.  Well, that's true of
flush brackets, there are also a few rare projecting brackets.  In some
countries there may be survey points which are actual plaques (a
more expensive equivalent of a cut mark) but the examples in
the proposal are brackets, not plaques.

An intuitive name in French would be "cartouche", which is not a plaque
> stricto sensu.
>

That word is also used in English, but the English meanings don't seem
applicable here.  It would be very confusing to call it that.

>
> Or it could be explicitly said in the proposal that the plaque may have
> any shape, as long as it is an object which is embedded on the surface of
> another one, such as a building.
>

Using "plaque" in that way would also apply to rivets and bolts, which are
very
different types of survey mark.  The point is to distinguish between the
different
types, not merge them all into "plaque" (if we do that then there is no
point
in having a type in the first place).

The types used in the UK are listed here:
http://www.rayhutchings.co.uk/?page_id=961
That doesn't have anything directly equivalent to your example.  However,
your
example looks to me like it might be a metal-reinforced version of a pivot
(that
is pure guesswork on my part) or the equivalent of a bolt but an "innie"
rather than an "outie."

-- 
Paul
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