[Tagging] Feature Proposal - RFC - survey_point:benchmark

Warin 61sundowner at gmail.com
Wed Mar 11 21:19:34 UTC 2020


On 12/3/20 1:16 am, Greg Troxel wrote:
> "ITineris OSM" <itineris.osm at gmx.com> writes:
>
>> I need help in tagging a special kind of survey points: geodesic towers.
> Are they called "geodetic" towers?
>
>> These are tubular concrete structures, with usual steel triangulation tripods on their top.
> Wow, those are pretty big!
>
>> They have the precise benchmark on the ground level, the tower is erected so that it's visible from far, being higher than the trees around.
>> They form the base of the national reference grid.
> I'm not sure if you mean "benchmark" as vertical control, or if you mean
> the horizontal control mark and then the tower is basically over it, to
> translate it up along the plumb line.
>
>
> So the control point is man_made=survey_point.  Then there is a tower
> which is physcially notable regardless, and the tourist bit.  OSM's
> representation does not really admit multiple primary tags on objects,
> except that sometimes they dno't conflict.
>
> I'd put in man_made=survey_point as a node for the thing on the ground,
> some survey_point:geodetic_tower=yes subtag on that (to inform those who
> care about the survey aspect of that), maybe some kind of height tag,
> and then draw a way around the tower and tag that as man_mde=tower
> and/or tourism.
>
> I don't think we should try to drag towerness and being an attraction
> into the survey_point namespace; it seems easy enough to dneote multiple
> properties separately.
> [>

+ 1 for using a node to signify the survey point, I would wait on a sub tag to see what happens with the present discussions.

For the tower I'm map that as an area with whatever tags you think appropriate, I'd not put any man_made=survey_point on it though.


>
>>   
>>
>> They could be tagging as <span style="color:#0000ff;"><span style="font-family:Courier New,Courier,monospace;">man_made=survey_point</span></span> because their main purpose is being a geodesic reference point.
>>
>> However, they could be a <span style="color:#0000ff;"><span style="font-family:Courier New,Courier,monospace;">man_made=tower</span></span>, for being a tower emerging from the surface - and to distinguish it from brackets, benchmarks or pavement rivets.
>>
>> Furthermore, additional functions can be connected to the latter only:
>>
>> Some of them are tourist attractions, like this https://hu.wikipedia.org/wiki/Cs%C3%B3v%C3%A1nyos#/media/F%C3%A1jl:Csovanyos2014_12.jpg. It is a <span style="color:#0000ff;"><span style="font-family:Courier New,Courier,monospace;">tower:type=observation</span></span>.
>>
>> If it's rigged with GSM and microwave antennae, it's <span style="color:#0000ff;"><span style="font-family:Courier New,Courier,monospace;">tower:type=communication</span></span>.
>>
>>
>>   
>>
>> (And of course you may add the <span style="color: rgb(0,0,255);"><span style="font-family: Courier New , Courier , monospace;">triangulation_point=yes</span></span> tagging.)
>>
>>   
>>
>> So how would you tag them?
>>
>>   
>>
>> Greets,
>> Ákos
>>
>>
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> w
>
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