[Tagging] Power=cable for low voltage lines?

Greg Troxel gdt at lexort.com
Thu Oct 18 13:10:59 UTC 2018

François Lacombe <fl.infosreseaux at gmail.com> writes:

> Le mar. 16 oct. 2018 à 00:20, Greg Troxel <gdt at lexort.com> a écrit :
>> So I don't see how we can make "insulated" a big deal in tagging,
>> defining the top-level tag, rather than being a detail to add when
>> known.
> I agree with both of you Greg and Marc
> Nevertheless, this was a debate in 2013 and I was in favor to merge line,
> cable and minor_line
> https://wiki.openstreetmap.org/wiki/Proposed_features/Power_transmission_refinement#power.3Dminor_line_and_power.3Dminor_cable_replacement
> Due to power=cable and power=line usage in OSM, many contributors didn't
> want to mass retag power=cable.
> Then we all agreed on line/cable distinction in late 2014 or 2015.
> https://wiki.openstreetmap.org/wiki/Proposed_features/Power_paths_refinement#Integrated_power.3Dcable

I guess that's how it is then :-(

> Note that insulation is also a draft proposal
> https://wiki.openstreetmap.org/wiki/Proposed_features/Insulation_proposal

That seems really difficult to deal with.  In particular, distribution
lines around me have a coating to provide mechcanicla protection but
which is not insulation in the electrical sense.  Even people with
engineering degrees cannot reliably tell this when looking at it from
several feet away.

> I'm still opposed to minor_line since in merge several different concept in
> one value, and is only useful for rendering.

If we morph it to distribution vs transmission, and say it means that,
it seems recoverable.

>> That said, I fully support your notion of tagging voltage, so that
>> low-voltage lines can be rendered only at extreme zooms, and to
>> assume a line is low voltage (240V seems like a reasonable default
>> assumption in terms of controlling rendering) if not tagged.
> Great, should we open an issue on carto github to propose to lower the
> rendering of cables without voltage?

I think you should go ahead and do that.  Basically power=cable or
power=line that lacks voltage should be treated as power=minor_line

In general I think it's good to have mistagged/undertagged things
rendered less, so that people will tag them to render, rather than
having to tag to unrender.

It would be intereresting to analyze the voltage tags on minor_line.
Probably there are none > 45 kV and few above 13.8 kV ish.

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