Hello again,
Based on the great feedback I got about the proposal I've updated in an
attempt to address the following concerns:
- Representing multiple tracks with a single way doesn't make sense
because trains can't "change lanes": I scrapped that part of the
proposal in favor of a new separate-way-per-track tagging scheme
described in the next point.
- Deferring the detail mapping to a separate proposal isn't good enough
because there is already detailed mapping in the wild that needs to be
addressed: I proposed a compromise that allows existing detail tagging
to be adapted via a single tag change per way and no geometry at all,
separating the concepts of "railway" (rail right of way) from
"railway:track" (an individual track).
- Also filled out my initial detail tagging proposal with a scheme for
describing the two-dimensional area occupied by the railway, based on
the area:highway proposal. As well as providing a nice 2D outline of the
railway right-of-way, it also provides a boundary to software that can
be used to answer the question "should I use the railway or the
railway:tracks?"... if an area:railway contains railway:track ways, they
should be used in favor of any railway way by software that supports both.
I believe this proposal provides a way for the two levels of detail to
co-exist in the OSM database and each be used in situations where they
are most appropriate.
The updated proposal is in the same place as the old one:
http://wiki.openstreetmap.org/wiki/Proposed_features/Railway_Schematic_Mapping
I'd appreciate it if those who have participated in the discussion so
far would take the time to review the updated proposal and let me know
what you think.
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