2013/1/27 Martin Koppenhoefer <dieterdre...@gmail.com> > 2013/1/26 François Lacombe <francois.laco...@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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