If you know the elevation in one system, can the elevation the other
systems be derived from that?

Vr gr Peter Elderson


Op ma 4 mei 2020 om 20:05 schreef Mark Wagner <mark+...@carnildo.com>:

> On Sun, 3 May 2020 14:16:09 +0200
> Martin Koppenhoefer <dieterdre...@gmail.com> wrote:
>
> > sent from a phone
> >
> > > On 3. May 2020, at 13:06, Volker Schmidt <vosc...@gmail.com> wrote:
> > >
> > > When I see an elevation value on the ground I do not see any
> > > reference to the reference system, so I cannot know, as a mapper,
> > > what reference system is at the base of the informaton that I find
> > > on the ground. In that respect the proposal is not at all clear
> > > from a practical perspective
> >
> >
> > the idea is you do not even have to know, simply copy the value from
> > the sign.
>
> What about regions where two or more reference systems are in common
> use?  If I copy an elevation from a USGS benchmark and put it in
> "ele:regional", how does an end-user know if it's a recent benchmark
> measured in NAVD 88 or an older benchmark measured in NVGD 29?
>
> --
> Mark
>
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