On 04/07/2013 12:13 PM, Clay Smalley wrote:
I do some mapping in SF too. The Muni Metro lines weirded me out when I
first saw it, and I looked up the proper practice on the wiki as well as
looking for a few examples in Europe, and it seems that the best
practice is to just add railway tags and the proper relations to the
street whenever it runs along a street, and as a way by itself when it
runs in its own right-of-way (such as the J line's jog around a hill a
little south of Dolores Park).
I'd support mapping the Muni Metro lines the European/more common way,
if nobody else has any objections.
I was actually leaning towards that too... that is, tagging the street
as also being a railway, and representing the double-tracked off-road
segments as a single way each. It's more consistent with how the highway
network is tagged right now, and there are a lot more highways than
there are railways in San Francisco.
However, I'm hesitant to destroy the detailed work done by other
mappers, both because that's disrespectful to the time they invested and
because those details interact with other objects in the map that would
also have to have their detail reduced. For example, a mapper has
represented the fact that there is a physical wall between the two
tracks as they enter the subway tunnel just to the east of the
intersection I showed.
At the same time, we lack the tagging required to do a detailed modeling
of the physical street layout today, and even if we had such a tagging
scheme I'm not sure that many mappers would have the time or energy to
implement it.
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