Estonia looking for public transit.
The purpose of this project is to offer a possibility for tracking public transit vehicles in "pseudo-real-time". The locations are calculated from the Estonian Road Administration's compiled GTFS static open data (or similar time-table data) and have no meaning whatsoever in reality.
Nevertheless (web-)map-makers might be interested in the current whereabouts of public transit at any given time. As these locations are based on calculations not GPS data they should under no circumstances be used as part of a critical decision process. But maybe it's still interesting to see buses-trains rattle along on the map.
Current locations are returned as a GeoJSON FeatureCollection using a HTTP GET
query to the web API.
An example "real-time dashboard"-style preview can be checked out here
The name of the project is a word play on an Estonian television talent show title.
The process of getting this thing up and running is currently a bit tedious, but we'll live with that for now.
Expects presence of PostgreSQL (9.4+) / PostGIS (2.1+). As a privileged user run
db/init.sql. This will create a database schema called gtfs,
a few tables into it (gtfs.agency, gtfs.calendar, gtfs.routes,
gtfs.shapes, gtfs.stop_times, gtfs.stops, gtfs.trips) and three
functions for dealing with location calculation (gtfs.get_current_impeded_time,
gtfs.get_time_fraction, public.split_line_multipoint). Credit for the
last function goes to rcoup's
StackExchange answer. With PostGIS 2.2
this function will not be necessary anymore and st_split(geometry, geometry)
can be used instead.
NB! Before running the sql file, please read carefully what it does. A sane mind should not run whatever things in a database ;)
Once the database tables and functions have been set up, data can be inserted.
But still, before data can be loaded to the database, Django (2.2 is the current LTS version), Django Rest Framework ja Django Rest Framework GIS should be installed. We need Django for data loading as we'll use Django's db connection factory.
You can simply pip them
$ pip install django==2.2
$ pip install djangorestframework
$ pip install pip install djangorestframework-gis
or simply use the requirements.txt because there are
some other things required aswell.
The configuration that is necessary for loading the data is described in api/conf/settings.py. To start the loading procedure you need to run api/sync/datasync.py
$ python datasync.py
And after the loading has finished, again, as a privileged user run db/preprocess.sql. Then we can fire up Django's development server with
$ python manage.py runserver
Point your browser to http://127.0.0.1:8000?format=json and you should see a response:
{"message":"Nobody expects the spanish inquisition!"}
HTTP GET queries
http://127.0.0.1:8000/current/locations?format=json Returns currently active vehicles and their locations together with data on previous and next stops, and routes.
http://127.0.0.1:8000/current/trips?format=json Returns currently active trips as linestrings from the first stop of the trip to the last.
FIXME: more queries?
The code for this project is freely usable under the Unlicense. The data it uses has it's own license terms - you need to
keep track of that yourself.
FIXME: need to set things straight with public.split_line_multipoint -
this is work done by somebody else! Can we use it at all?