transit pattern mapping table structure

Information pertaining to GTFS map-matching is held on this table if the feed has been map-matched during the import process. This map-matching is required for running transit in traffic, but it is not required by the transit assignment per se.

Table Structure

Field	Type	NULL allowed	Default Value	Foreign key	Description
pattern_id*	INTEGER	NO		Transit_Patterns(pattern_id)	ID of the transit pattern this mapping applies to
index	INTEGER	NO			Index of the link in the pattern
link	INTEGER	NO		Link(link)	ID of the link in the network
dir	INTEGER	NO			Direction of the link in network
stop_id	INTEGER	YES		Transit_Stops(stop_id)	ID of the transit stop that projects onto the given roadway link
offset	REAL	YES			Distance from the start of the link to the stop in meters
geo	LINESTRING	YES

(* - Primary key)

The SQL statement for table and index creation is below.

CREATE TABLE IF NOT EXISTS "Transit_Pattern_Mapping" (
    pattern_id INTEGER NOT NULL,
    "index"    INTEGER NOT NULL,
    link       INTEGER NOT NULL,
    dir        INTEGER NOT NULL,
    stop_id    INTEGER,
    offset     REAL,

    PRIMARY KEY(pattern_id,"index"),
    FOREIGN KEY(pattern_id) REFERENCES Transit_Patterns(pattern_id) deferrable initially deferred,
    FOREIGN KEY(stop_id) REFERENCES Transit_Stops(stop_id) deferrable initially deferred,
    FOREIGN KEY(link) REFERENCES Link(link) deferrable initially deferred -- check
);

CREATE INDEX IF NOT EXISTS transit_pattern_mapping_stop_id ON Transit_Pattern_Mapping (stop_id);

SELECT AddGeometryColumn( 'Transit_Pattern_Mapping', 'geo', SRID_PARAMETER, 'LINESTRING', 'XY');

SELECT CreateSpatialIndex( 'Transit_Pattern_Mapping' , 'geo' );