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estebanzimanyiestebanzimanyi
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Improve GTFS chapter
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‎docs/GTFS.xml

+21-34
Original file line numberDiff line numberDiff line change
@@ -25,10 +25,6 @@
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<para><varname>calendar_dates.txt</varname> define exceptions to the default service patterns defined in <varname>calendar.txt</varname>. There are two types of exceptions: 1 means that the service has been added for the specified date, and 2 means that the service has been removed for the specified date.</para>
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</listitem>
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<listitem>
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<para><varname>route_types.txt</varname> contains transportation types used on routes, such as bus, metro, tramway, etc.</para>
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</listitem>
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<listitem>
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<para><varname>routes.txt</varname> contains transit routes. A route is a group of trips that are displayed to riders as a single service.</para>
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</listitem>
@@ -85,7 +81,6 @@ CREATE TABLE calendar (
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end_date date NOT NULL,
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CONSTRAINT calendar_pkey PRIMARY KEY (service_id)
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);
88-
CREATE INDEX calendar_service_id ON calendar (service_id);
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CREATE TABLE exception_types (
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exception_type int PRIMARY KEY,
@@ -97,19 +92,14 @@ CREATE TABLE calendar_dates (
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date date NOT NULL,
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exception_type int REFERENCES exception_types(exception_type)
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);
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CREATE INDEX calendar_dates_dateidx ON calendar_dates (date);
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CREATE TABLE route_types (
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route_type int PRIMARY KEY,
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description text
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);
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CREATE INDEX calendar_dates_date_idx ON calendar_dates (date);
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CREATE TABLE routes (
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route_id text,
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route_short_name text DEFAULT '',
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route_long_name text DEFAULT '',
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route_desc text DEFAULT '',
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route_type int REFERENCES route_types(route_type),
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route_type int,
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route_url text,
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route_color text,
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route_text_color text,
@@ -122,15 +112,14 @@ CREATE TABLE shapes (
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shape_pt_lon double precision NOT NULL,
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shape_pt_sequence int NOT NULL
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);
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CREATE INDEX shapes_shape_key ON shapes (shape_id);
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CREATE INDEX shapes_shape_id_idx ON shapes (shape_id);
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-- Create a table to store the shape geometries
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CREATE TABLE shape_geoms (
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shape_id text NOT NULL,
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shape_geom geometry('LINESTRING', 4326),
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shape_geom geometry('LINESTRING', 3857),
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CONSTRAINT shape_geom_pkey PRIMARY KEY (shape_id)
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);
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CREATE INDEX shape_geoms_key ON shapes (shape_id);
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CREATE TABLE location_types (
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location_type int PRIMARY KEY,
@@ -146,9 +135,9 @@ CREATE TABLE stops (
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stop_lon double precision,
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zone_id text,
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stop_url text,
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location_type integer REFERENCES location_types(location_type),
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location_type integer REFERENCES location_types(location_type),
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parent_station integer,
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stop_geom geometry('POINT', 4326),
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stop_geom geometry('POINT', 3857),
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platform_code text DEFAULT NULL,
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CONSTRAINT stops_pkey PRIMARY KEY (stop_id)
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);
@@ -160,7 +149,7 @@ CREATE TABLE pickup_dropoff_types (
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CREATE TABLE stop_times (
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trip_id text NOT NULL,
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-- Check that casting to time interval works.
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-- Check that casting to time interval works
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arrival_time interval CHECK (arrival_time::interval = arrival_time::interval),
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departure_time interval CHECK (departure_time::interval = departure_time::interval),
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stop_id text,
@@ -183,7 +172,6 @@ CREATE TABLE trips (
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shape_id text,
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CONSTRAINT trips_pkey PRIMARY KEY (trip_id)
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);
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CREATE INDEX trips_trip_id ON trips (trip_id);
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INSERT INTO exception_types (exception_type, description) VALUES
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(1, 'service has been added'),
@@ -218,8 +206,6 @@ COPY trips(route_id,service_id,trip_id,trip_headsign,direction_id,block_id,shape
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FROM '/home/gtfs_tutorial/trips.txt' DELIMITER ',' CSV HEADER;
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COPY agency(agency_id,agency_name,agency_url,agency_timezone,agency_lang,agency_phone)
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FROM '/home/gtfs_tutorial/agency.txt' DELIMITER ',' CSV HEADER;
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COPY route_types(route_type,description)
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FROM '/home/gtfs_tutorial/route_types.txt' DELIMITER ',' CSV HEADER;
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COPY routes(route_id,route_short_name,route_long_name,route_desc,route_type,route_url,
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route_color,route_text_color) FROM '/home/gtfs_tutorial/routes.txt' DELIMITER ','
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CSV HEADER;
@@ -233,12 +219,12 @@ CSV HEADER;
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<programlisting language="sql">
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INSERT INTO shape_geoms
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SELECT shape_id, ST_MakeLine(array_agg(
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ST_SetSRID(ST_MakePoint(shape_pt_lon, shape_pt_lat),4326) ORDER BY shape_pt_sequence))
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ST_Transform(ST_Point(shape_pt_lon, shape_pt_lat, 4326), 3857) ORDER BY shape_pt_sequence))
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FROM shapes
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GROUP BY shape_id;
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UPDATE stops
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SET stop_geom = ST_SetSRID(ST_MakePoint(stop_lon, stop_lat),4326);
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SET stop_geom = ST_Transform(ST_Point(stop_lon, stop_lat, 4326), 3857);
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</programlisting>
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The visualization of the routes and stops in QGIS is given in <xref linkend="stib" />. In the figure, red lines correspond to the trajectories of vehicles, while orange points correspond to the location of stops.
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</para>
@@ -253,20 +239,20 @@ SET stop_geom = ST_SetSRID(ST_MakePoint(stop_lon, stop_lat),4326);
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<sect1>
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<title>Transforming GTFS Data for MobilityDB</title>
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<para>
256-
We start by creating a table that contains couples of <varname>service_id</varname> and <varname>date</varname> defining the dates at which a service is provided.
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We start by creating a table that contains couples of <varname>service_id</varname> and <varname>date</varname> defining the dates at which a service is provided.
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<programlisting language="sql">
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DROP TABLE IF EXISTS service_dates;
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CREATE TABLE service_dates AS (
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SELECT service_id, date_trunc('day', d)::date AS date
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FROM calendar c, generate_series(start_date, end_date, '1 day'::interval) AS d
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WHERE (
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(monday = 1 AND extract(isodow FROM d) = 1) OR
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(tuesday = 1 AND extract(isodow FROM d) = 2) OR
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(wednesday = 1 AND extract(isodow FROM d) = 3) OR
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(thursday = 1 AND extract(isodow FROM d) = 4) OR
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(friday = 1 AND extract(isodow FROM d) = 5) OR
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(saturday = 1 AND extract(isodow FROM d) = 6) OR
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(sunday = 1 AND extract(isodow FROM d) = 7)
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(monday = 1 AND extract(isodow FROM d) = 1) OR
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(tuesday = 1 AND extract(isodow FROM d) = 2) OR
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(wednesday = 1 AND extract(isodow FROM d) = 3) OR
252+
(thursday = 1 AND extract(isodow FROM d) = 4) OR
253+
(friday = 1 AND extract(isodow FROM d) = 5) OR
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(saturday = 1 AND extract(isodow FROM d) = 6) OR
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(sunday = 1 AND extract(isodow FROM d) = 7)
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)
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EXCEPT
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SELECT service_id, date
@@ -304,8 +290,8 @@ FROM trips t JOIN stop_times s ON t.trip_id = s.trip_id;
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UPDATE trip_stops t
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SET perc = CASE
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WHEN stop_sequence = 1 then 0.0
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WHEN stop_sequence = no_stops then 1.0
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WHEN stop_sequence = 1 THEN 0.0
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WHEN stop_sequence = no_stops THEN 1.0
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ELSE ST_LineLocatePoint(g.shape_geom, s.stop_geom)
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END
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FROM shape_geoms g, stops s
@@ -441,7 +427,8 @@ CREATE TABLE trips_mdb (
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);
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INSERT INTO trips_mdb(trip_id, service_id, route_id, date, trip)
444-
SELECT trip_id, service_id, route_id, date, tgeompoint_seq(array_agg(tgeompoint_inst(point_geom, t) ORDER BY T))
430+
SELECT trip_id, service_id, route_id, date, tgeompointSeq(array_agg(
431+
tgeompoint(point_geom, t) ORDER BY T))
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FROM trips_input
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GROUP BY trip_id, service_id, route_id, date;
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