In my mind, average mapper (with engineering degree or not, someone who don't want get busy with hard & specialized technical stuff) only see the line.
The line is the base concept of all the rest. It support tags and circuits relations. It can has 1 or several conductors, that's not the point at first sight. It's the simplest to map too : you put a way with power=line, nodes with power=tower or pole and that's it. Someone who wants to go deeper with concepts can add some extra tags and spend extra hours to design substation material at its discretion. If we let users choose the right tag to use, the underlying question of this thread won't be answered at all, that's my fear. If we look at power=line vs power=cable, there are only 838 ways tagged as cable against 184 554 ways described as power=line. http://wiki.openstreetmap.org/wiki/Tag:power%3Dcable Correct the wiki will be harder than migrate all these 838 ways to power=line + location=underground. 2013/1/15 Volker Schmidt <vosc...@gmail.com> > Just to be sure, I have consulted my professional electrical engineer > colleagues. > We agree that there is some space for ambiguity. > When one (overground) power line (which is composed of several conductors) > goes underground, the power line continues as one or several underground > cables, depending on the technical implementation. High-power lines are > always implemented underground as several cables with every cable carrying > one conductor, as seems to be shown in the example picture > > https://lh3.ggpht.com/-CnkQkGiPmbs/UFM6M2N0lUI/AAAAAAAAArk/IMZxA3i6SmY/s1600/tunnel.png > > My conclusion: I would simply suggest to accept both power=line and > power=cable as equivalent. The average mapper is not an electrical engineer > after all. > > Volker > -- *François Lacombe* francois dot lacombe At telecom-bretagne dot eu http://www.infos-reseaux.com
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