On 2016-11-01 06:12, Felix Delattre wrote:
On 31/10/16 19:05, Stephen Sprunk wrote:
For those not familiar with Transmodel, can you either explain what
its terms are for the concepts in question and/or point us to
resources that do?
I found this PDF on transmodel's definitions and concepts useful:
http://transmodel-cen.eu/wp-content/uploads/2015/02/TRM6_Glossary-Part-123.pdf
That'll take a while to digest fully, but it appears your excerpt covers
the current topic succinctly. Thanks!
* LINE: A group of ROUTEs which is generally known to the public by a
similar name or number
* ROUTE: An ordered list of located POINTs defining one single path
through the road (or rail) network. A ROUTE may pass through the same
POINT more than once.
I take it as a good sign that those are roughly the same terms/ideas
that we collectively came up with off the cuff. It's also good that
they're ones a layman can fairly easily understand. Unfortunately, both
end here.
* JOURNEY PATTERN: An ordered list of SCHEDULED STOP POINTs and TIMING
POINTs on a single ROUTE, describing the pattern of working for public
transport vehicles.A JOURNEY PATTERN may pass through the same POINT
more than once. The first point of a JOURNEY PATTERN is the origin. The
last point is the destination.
OSM: This seems to be (very) roughly equivalent to the set of
stop_positions in a given route. Without an additional formal level of
abstraction, journey patterns along the same route have to duplicate the
correct subset of ways in addition to the stop_positions. I recognized
that as frustrating when I did the rail lines here but I couldn't put my
finger on exactly why at the time.
GTFS: This sounds like a shape, but it's optional and most agencies
don't seem to bother, which means you have to compare the full list of
stops to determine if two trips are using the same pattern. But lazy
agencies would probably give up entirely if they had to create/provide
shapes, so I get it.
* VEHICE JOURNEY: The planned movement of a public transport vehicle on
a DAY TYPE from the start point to the end point of a JOURNEY PATTERN
on
a specified ROUTE.
OSM: If schedule information is out of scope, I don't see a need/use for
an equivalent to this. (Not an argument either way, just a
consequence.)
GTFS: This sounds like a trip.
S
--
Stephen Sprunk "Those people who think they know everything
CCIE #3723 are a great annoyance to those of us who do."
K5SSS --Isaac Asimov
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