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| -rw-r--r-- | GLOSSARY.md | 35 |
1 files changed, 22 insertions, 13 deletions
diff --git a/GLOSSARY.md b/GLOSSARY.md index 664edd9..062f897 100644 --- a/GLOSSARY.md +++ b/GLOSSARY.md @@ -8,24 +8,33 @@ terminology used by GTFS. ## Terms +Ticket +: A single tracked trip. These are imported from the GTFS (or couple be created + manually via the web interface), and are independent from it, i.e. they are + saved in tracktrain's data base and won't change with subsequent GTFS updates, + but would have to be deleted and reimported instead. + + This prevents tracktrain from ending up with invalid data if a trip's id + or stops change retroactively. + +Trip (don't confuse with Train) +: Used as in GTFS: a trip is a defined sequence of *stops*, referred to by + a number (called its trip ID, e.g. IC 94). Usually runs on multiple + days. Always has an associated *shape*. + + (might match your intuition for "train line") + (Calendar-)Date / Day : A single, unique day (e.g. 1970-01-01). Usually used to indicate if a *trip* is running on that day or not. -Time (of Day) +Seconds (on a given Day) : Time on a given day, given in seconds (though often displayed as minutes) since midnight. If a trip crosses midnight it is treated as if it took place entirely on the previous day, and times simply count up beyond the total number of seconds in a day (note that that's a timezone-series dependent number). -Trip (don't confuse with Train) -: Used as in GTFS: a trip is a defined sequence of *stops*, referred to by - a number (called its trip ID, e.g. IC 94). Usually runs on multiple - days. Always has an associated *shape*. - - (might match your intuition for "train line") - Stop : A *station* with associated arrival/departure *time*. @@ -37,11 +46,6 @@ Shape : A sequence of geolocations describing a line between stations, describing the physical railway along which trains travel. -Train (don't confuse with Trip) -: A single instance of a *trip* on a concrete *date*. Tracktrain mostly - concerns itself with keeping track of those; the rest is just additional - stuff. - Vehicle : An actual, physical vehicle, which might act as the *train* going along a *trip* on a certain *date*. @@ -57,6 +61,11 @@ Announcement : A single packet of data sent from a train's *OBU*. Might arrive in some arbitrary order. +(Train-)Anchor +: An "anchored" point of position of a train along a trip; a snapshot of its + delay and state at a known position. These are generated from train pings, + and are the basis for extrapolating future delays for passanger information. + Control Room : The "admin interface" of tracktrain, which is not meant to be used by on-board staff. |