On 25/01/2013 19:23, Janko Mihelić wrote:
2013/1/25 fly <lowfligh...@googlemail.com
<mailto:lowfligh...@googlemail.com>>
but I also see a problem with using power=sub_station for all now. I
think there
is a difference between big substations and the real small ones
(tagged with as
substations right now). Even if it is only a difference in voltage,
we will
loose this information. Also I would have to either tag the object
as substation
and transformer or add another node for the transformer (rarely
visible) within
the closed way.
People should NOT start retagging existing 'stations' without adding a
voltage tag!
We can use a medium solution and introduce these values for voltage:
voltage=low, voltage=medium, voltage=high. Those can than be shown on a
map as an error (like fixme=*), and mappers will have to put real
voltage instead of these.
That is a resonable solution. I sometimes do this for transformers when
I know the higher voltage but not the lower voltage, such as
voltage=60000;medium. There should probably be written some guidence in
the wiki on when to use voltage=high and voltage=medium.
But still I wouldn't recommend retagging without reviewing each
substation individually. In some areas the distinction between large and
small substations may have been tagged consistently. In my areas of
interest (Denmark, Netherlands) the use of 'station' was a big mess with
the tag being put on anything from small transformer buildings to big
power plants.
Think we aswell need a tag for power plants as I often have problems
to tag the
power=generator on big power plants and some even have more than
one. Where
should I add my tags, to the real generators or the whole area ?
I think power=generator was meant to be used as power=sub_station, so
the whole area. Problem is that power plants often have many parts,
especially hydro power plants (landuse=reservoir, man_made=pipeline,
power=sub_station, power=generator, numerous other buildings). Which
ones are contained in the power=generator area? We should make a better
wiki page for those.
It is a little bit sad that the proposal
http://wiki.openstreetmap.org/wiki/Proposed_features/Power_generation_refinement
died due to lack of votes. It would have resolved these problems. Maybe
somebody could review and eventually improve it and put it forward for a
new vote (this time advertised properly).
As the power=* tags seem to be more isolated than some other tags it
might be
possible to try a complete but carefully redesigning once we have
clarified the
meanings and there translations.
This will hopefully include correcting misspelled tags.
I agree. We could add the tag power=substation to the wiki and patiently
wait for mappers to adopt it. And in a few years, we could do to
power=sub_station what we are doing now to power=station :)
May be a good idea. It would be crucial to convince the Mapnik
stylesheet maintainers to support that tag. Otherwise the adaptation may
be very slow (the chicken and egg dilemma). Mappers like to see their
data rendered.
Ole
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