Plausibility check of ridership data

The comparison of the ridership data with the public transport supply stored in the Visum network model checks the plausibility of the ridership data and adds any missing information. Plausible information in the ridership data generates public transport paths. Each ridership data item is assigned a relation to the associated public transport path leg and to the public transport path as soon as the data set is recognized as plausible. The relation is reciprocal. The public transport path leg/path also refers to the plausible ridership data (sets).

Ridership data can reach different levels of plausibility after the plausibility check. These are based on the degree of freedom of the plausibility check to ignore passenger information and search for paths independently. No public transport paths are generated from implausible and incomplete data sets.

Status IDs for the plausibilization quality

for the recorded path leg E (Table 197)
for the pre-survey leg V (Table 198)
for the post-survey leg N (Table 199)
for the entire survey data set G (Table 200)

Table 197: Status indicators for the surveyed path leg
Status indicators for the surveyed path leg (E)
0	Not yet checked
Plausible
Plausible: Corresponds to the specifications (1)	A vehicle journey could be found in the surveyed time profile (or surveyed line route or line, depends on preciseness of input data), which connects boarding stop and alighting stop of the surveyed path leg and starts within the time tolerance interval defined for the time of departure from the boarding stop.
Plausible: Deviating line route or time profile (2)	A vehicle journey could be found in another time profile (or line route) of the surveyed line, which connects boarding stop and alighting stop of the surveyed path leg and starts within the time tolerance interval defined for the time of departure from the boarding stop.
Plausible: Deviating line (3)	A vehicle journey could be found in a time profile of another line, which connects boarding stop and alighting stop of the surveyed path leg and starts within the time tolerance interval defined for the time of departure from the boarding stop.
Plausible: One path leg has been determined by shortest path search (5)	For the surveyed path leg, an indirect connection (with transfers, including walk links) could be found by timetable-based connection search (shortest path search), which departs from the boarding stop within the tolerance interval defined for the departure time from this stop.
Not plausible
Unplausible: No direct line route found (7)	Implausible, because none of the line routes (which are valid due to current parameter settings) connects boarding stop and alighting stop and connection search is not permitted either.
Unplausible: No departure at specified time (8)	Implausible, because the time profiles of the line routes (which are valid due to current parameter settings) connecting boarding and alighting stop do not include a departure within the time tolerance interval defined for the time of departure from the boarding stop and connection search is not permitted either.
Unplausible: No connection found (9)	Implausible, because no connection from boarding to alighting stop starting in the given time frame could be found during connection search calculation.

Table 198: Status indicators for the pre-survey leg
Status indicators for the pre-survey leg (V)
Untreated (0)	Does not exist
Plausible
Plausible: Corresponds to the specifications (1)	A vehicle journey could be found in the pre-survey leg time profile (or pre-survey leg line route or line or transport system, depends on preciseness of input data), which meets the condition defined for the permitted time span.
Plausible: Deviating line route or time profile (2)	A vehicle journey could be found in another time profile of the pre-survey leg line, which meets the condition defined for the permitted time span.
Plausible: Deviating line (3)	A vehicle journey could be found in a time profile (or line route) of another line, which meets the condition defined for the permitted time span.
Plausible: One path leg requires an additional transfer (5)	Replacing at least one of the pre-survey path legs by an indirect connection which was found by timetable-based connection search (incl. transfer(s) and walk link(s), if applicable).
Plausible: Unplausible pre-survey leg or post-survey leg replaced by shortest path (6)	Replacing the implausible (multi-part) pre-survey leg from OriginStop to BoardStop by a connection with an arrival time matching the departure time of the survey line from the BoardStop.
Not plausible
Unplausible: No connection found (9)	Implausible, because no path leg (or sequence of path legs) could be found meeting the given validity check criteria.

Status indicators for the post-survey leg (N)
Untreated (0)	Does not exist
Plausible
Plausible: Corresponds to the specifications (1)	A vehicle journey could be found in the post-survey leg time profile (or post-survey leg line route or line, depends on preciseness of input data), which meets the defined for the permitted time span.
Plausible: Deviating line route or time profile (2)	A vehicle journey could be found in another time profile (or line route) of the post-survey leg line, which meets the condition defined for the permitted time span.
Plausible: Deviating line (3)	A vehicle journey could be found in a time profile (or line route) of another line, which meets the condition defined for the permitted time span.
Plausible: One path leg requires an additional transfer (5)	Replacing at least one of the post-survey path legs by an indirect connection which was found by timetable-based connection search (incl. transfer(s) and walk link(s), if applicable).
Plausible: Unplausible pre-survey leg or post-survey leg replaced by shortest path (6)	Replacing the implausible (multi-part) post-survey leg from AlightStop to DestStop by a connection with a departure time matching the arrival time of the survey line at the AlightStop.
Not plausible
Unplausible: No connection found (9)	Implausible, because no path leg (or sequence of path legs) could be found meeting the given validity check criteria.

Table 199: Status indicators for the post-survey leg

Table 200: Status indicators for the entire survey data record
Status indicators for the entire survey data record (G)
Untreated (0)	Not processed
Plausible
Plausible: Corresponds to the specifications (1)	All of the sections (pre-survey leg(s), post-survey leg(s) and/or survey path leg) are plausible.
Not plausible
Unplausible: No connection found (9)	Implausible because of one (or more) implausible sections (pre-survey leg(s), post-survey leg(s) and/or survey path leg).
Unplausible: Required walk links missing (10)	Unplausibe, as path legs are plausible, but walk links in between are not. The same applies for missing transitions between stop areas.