[OSM-talk] RFC: geodesy=pillar

Andy Robinson Andy_J_Robinson at blueyonder.co.uk
Mon Jul 16 20:00:36 BST 2007


Mike Collinson wrote:
>Sent: 16 July 2007 7:45 PM
>To: talk at openstreetmap.org
>Subject: Re: [OSM-talk] RFC: geodesy=pillar
>
>At 07:38 PM 16/07/2007, Dirk-Lüder Kreie wrote:
>>-----BEGIN PGP SIGNED MESSAGE-----Hash: SHA1
>>Iván Sánchez Ortega schrieb:
>>> Call them triangulation pillars, call them geodetic vertices, call them
>how > you like. Fact is, I'm gonna upload a few thousand of them in a
>couple of > days.> > So, I'm proposing the following tags to be applied on
>nodes:> > geodesy = pillar> Depicts a geodetic (or geodesic) pillar> >
>geodesy:network = foobar> Several pillars together form a geodetic network,
>which usually has a name.> > geodesy:reference = 1234> Pillars in the same
>network are identified by a reference number.
>>I couldn't attend SOTM but I do have one request with respect to thenode
>tagging:Can you use a more general term than "pillar" because that seems
>toapply to western europe only.
>>I'm trying to get a list of german "nodal points" without databaserights
>constraints. Those are seldomly in the form of a pillar. (in factI have
>seen no pillars in .de or .at, but different forms of marking thepoint in
>question. (mostly involving some brass "nail" in some sort ofstone
>foundation or a cross mark chiseled into the surface of the rock)
>>You might also want to register wether the vertex is just for
>eitherpositional or height reference, or both.
>>-
>
>In the UK, I believe geodetic surveyor's marks are called "benchmarks" (I
>don't recall if that is one or two words).  Would that suffice?
>

Benchmarks apply only to survey points with a specific elevation rather than
a specific location. However it's important to note that many geodetic
survey stations include benchmarks.

Cheers

Andy


>Mike
>
>
>
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