[Tagging] Contents of tagging digest, Vol 41, Issue 8, message 4

Martin Koppenhoefer dieterdreist at gmail.com
Sun Feb 3 12:23:33 GMT 2013

2013/2/3 St Niklaas <st.niklaas at live.nl>:
>> viaduct
>> A ''long'' rail, road, or other bridge made up of many short spans.
>> no
>> 7?572 0.45% hint for other mappers, no special treatment
> I used that one, after reading the Wiki I abandoned it.
> +1

actually the comment above is refering to bridge=no

>> aqueduct
>> 1?084 0.06% prefer historic=aqueduct for historic aqueducts (also
>> fragments) and would rather introduce a tag similar to "power" for
>> water if I wanted to map modern aqueducts. Anyway an aqueduct has not
>> much to do with bridges
> -1

> Both are IMHO originally latin


>, a viaduct is a crossing between 2 ways and a
> aquaduct a crossing between a way and a waterway.

no, it is not about crossing, it is about "conducting", an aqueduct is
conducting water, a viaduct is conducting a road. An aqueduct can be
on the ground, on a wall, below ground, and also span over something
with a bridge. bridge=aqueduct is therefor not a suitable tag for
aqueducts, but it could be OK in some cases. In the end if you already
use a different tag to say it is an aqueduct you just as well use
bridge=yes for these parts.


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