[Tagging] Is the difference between power station and sub station clear?

[Janko Mihelić]

2013/1/27 Martin Koppenhoefer <dieterdreist at gmail.com>

> 2013/1/26 François Lacombe <francois.lacombe at telecom-bretagne.eu>:
>
> -1, don't share this idea. IMHO a completely different substation
> apperance and size, usage etc. are sufficient arguments to keep
> different main entities (classes) in osm. There is no rule that we
> have to have strictly functional classification, and in the past
> mappers had found it useful to have the classes like this.
>

History has shown that mappers around the world have been mapping
substations differently, because these two tags are so vague. They have
been mapping power plants with power=station, big substations with
power=sub_station, little substations with power=station.Why? Because a
mapper layman has to know the difference between a high voltage substation,
and a middle/lower voltage substation to map them correctly. That is a
recipe for faults.

If you only have power=sub_station, beginners are much more likely to map
correctly. And if they know more, they can put in a
voltage=high;medium;low. But even if they don't, you can guess which kind
of a station it is. If it has power=sub_station + building=yes, it is
probably a middle or low voltage substation. If the area of the
power=sub_station is bigger than 60m2, then it is probably a high voltage
substation. I think that is much better than to force the mapper layman to
decide.

Janko Mihelić
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