<div class="gmail_quote">2013/2/11 Ole Nielsen <span dir="ltr"><<a href="mailto:on-osm@xs4all.nl" target="_blank">on-osm@xs4all.nl</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
<br>
Well, that seems like overkill to me. A manual inspection of the lines terminating at the substation should be sufficient (assuming their voltages have been tagged).<br></blockquote><div><br>I made a little Overpass query which finds stations that have power lines with certain voltages 30 meters or less from a station, and the station doesn't have that voltage in it's voltage=* tag. Mistakes can happen, because I still don't know how to find an end of a line in overpass, so each station near a middle of a line will show up.<br>
<br>Also, I made power=station tags show up, which need retagging.<br><br>Here is the link, I hope it has no mistakes (click Run when you find an interesting position):<br><a href="http://tinyurl.com/aeznguc">http://tinyurl.com/aeznguc</a><br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
I have noticed that you can quite easy detect the voltages handled in the substation by measuring the distances between busbars (Bing imagery is mostly sufficient detailed to allow this). It requires that you know the standard voltages used in the given area but is otherwise a pretty reliable way of distinguishing voltages. I'm thinking about writing a wiki page explaining how to detect voltages and other features of power grids from aerial imagery.<br>
</blockquote><div><br>That's great, unfortunately only for places with hires imagery.<br><br>Janko Mihelić<br></div></div>