[Tagging] Underground power lines in tunnel

[John F. Eldredge]

There are three "height" types for a bridge over a navigable waterway: the maximum distance from ground level to the highest part of the bridge structure, the maximum height of vehicle plus cargo that can go across the bridge, and the maximum clearance for vehicles passing under the bridge.  The proposal mentions the first two, but not the third.  It does not, as far as I can tell, provide for a way to specify where the reference point is located for the height-above-ground figure, which is an issue since the ground level at one end of a bridge is often different from the ground level at the other end.  The proposal states, correctly, that the maximum height of a vehicle is a property of each of the ways passing across.  Roads passing under the bridge need to be tagged with max height.  The tricky part is tagging the max height of ships that may wish to pass under the bridge, as this will vary with the water level.  The current proposal doesn't seem to handle either aspect of the
ship-clearance questions.
 

"François Lacombe" <francois.lacombe at telecom-bretagne.eu> wrote:
>Hi
>
>
>2013/6/5 Martin Koppenhöfer <dieterdreist at gmail.com>
>
>>
>>
>> This one, right?
>>
>http://wiki.openstreetmap.org/wiki/Relations/Proposed/Bridges_and_Tunnels
>>
>> +1 from me, although we don't need voting to use the tags ;-)
>>
>
>Sure this one.
>
>I don't recognize the common proposal template.
>Is there other one for relations proposal ?
>
>If not, I'll edit it to match traditional workflow.
>
>
>> an issue I see is the height property, AFAIK this is often indicated
>as
>> distance from the ground/surface below to the carriageway (that's
>what the
>> proposal says at the moment), but could also be used (osm) for the
>greatest
>> vertical extension including towers / pylons etc. (would be more
>consistent
>> with how the height tag is usually used in osm)
>>
>> Other interesting tags to add are architect (sometimes), start_date,
>ele
>> and wikipedia. I'd also like to see some proposal regarding the
>structure.
>>
>
>Let's discuss it on Talk page ? :)
>
>Cheers.
>
>
>*François Lacombe*
>
>francois dot lacombe At telecom-bretagne dot eu
>http://www.infos-reseaux.com
>
>
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>
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