residentmario/gtfs-tripify

Turn GTFS-RT transit updates into historical arrival data.

gtfs-tripify

Many major transit municipalities in the United States public realtime information about the state of their systems using a common format known as a GTFS-Realtime feed. This is the information that the Metropolitan Transit Authority, for example, uses to power its arrival countdown clocks on station platforms.

gtfs-tripify is a Python package for turning streams of GTFS-Realtime messages into a "trip log" of train arrival and departure times. The result is the ground truth history of arrivals and departures of all trains included in the inputted GTFS-RT feeds:

To learn more about gtfs_tripify check out the docs.

Note that gtfs_tripify is an experimental (unmaintained) library. It is provided as-is.

gtfs-tripify's Issues

Deal with misaligned triplines

A highly visible parsing artifact are trips which are for some reason coded as going linearly and then backwards in time:

pip install unsuccessful under python2.7 and python3.7 in virtualenvironment

Under python2.7:

virtualenv test2env
source test2env/bin/activate
pip install git+git://github.com/ResidentMario/gtfs-tripify.git@master
python -c "import gtfs_tripify"

This produces

Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: No module named gtfs_tripify

Similarly under python3.7:

/usr/local/bin/python3 -m venv test-env
source test-env/bin/activate
pip install git+git://github.com/ResidentMario/gtfs-tripify.git@master
python -c "import gtfs_tripify"

This produces an identical error. The installation is creating only an egg-info directory in site-packages, not a gtfs_tripify source directory. I'm a novice when it comes to python packaging, so it's probably my mistake or could be an easy fix.

Matching VehiclePosition and TripUpdate

Capture and throw away vehicle updates that do not also have trip updates - is this a gtfs spec requirement or MTA specific?