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Element |
Description |
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Calculate assignment |
Note You may, for example, calculate only skim matrices or perform connection export. |
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Calculate skim matrices |
Select this option to calculate the skim matrices selected on the Skim matrices page (Timetable-based assignment: Skim matrices page). |
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Analyze risk of delay |
If the option is selected, the risk of delay is analyzed after assignment. You can make further settings on the Risk of delay page (Timetable-based assignment: Risk of delay page). |
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Calculate service frequency |
If this option has been selected, the service frequency is calculated for each OD pair. The frequency of service indicates how often a supply operates on a relation (Fundamentals: Skims of frequency). The service frequency by OD pair can be displayed in the Service frequency column of the Paths > PuT OD pairs list. |
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Use connector shares |
If this option is selected, the assignment is calculated with a proportional distribution of the transport demand across the connectors (Fundamentals: Distribution of the travel demand to PuT connectors). Notes If you want zones to be accounted for with proportional distribution during the assignment, set the Share PuT attribute to 1 (yes). The shares of the connectors of these zones must be specified (Connectors: Basis tab). If this option has been checked, certain path attributes in lists are no longer defined clearly, e.g. access time. |
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Save detailed log files |
If this option is checked, the assignment results will be saved to log files on the connection level. |
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Restrict demand data section |
OD pairs considered for assignment Use the drop-down list to determine which OD pairs enter the assignment.
Note The setting specified for the OD pairs analyzed might differ from the setting for skim matrix calculation. If a restricting zone interval has been set for assignment, this will reduce the number of analyzed OD pairs even more. Restrict and destination origin zones Here you can restrict the calculation to the demand of the selected origin and destination zones. Thus only the selected rows of the demand matrix will be assigned. Notes If both entry fields are empty, Visum will assign the entire demand matrix. If only a single zone number is entered, Visum will use this value as the upper or lower limit respectively (half-open interval). The restriction applies to all iteration steps of the procedure: assignment, skim matrix calculation, and connection export, where applicable. In addition, the restrictions of the drop-down list OD pairs considered for assignment apply. |
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Assignment time period section |
From – To Only that part of the timetable and travel demand are considered for assignment that lies within the specified time period. The time period must be entirely within the analysis period. Note If a calendar is used, you need to select a weekday or a date (Selecting a calendar ). Pre-assignment/Post-assignment period The assignment takes into account only the part of the timetable that lies within the interval, defined by the pre-assignment, the from/to parameters, and the post-assignment. If this interval is not within the analysis period, a ring closure is performed with respect to the analysis period. So, for example, if you have a weekly calendar and the analysis period is limited to Wednesday, the assignment period is Wednesday and the post-assignment time is 4h, then the assignment after 24:00 will take into account the Wednesday timetable, not the Thursday timetable. Note Connections can already start in the pre-assignment time and they can only end in the post-assignment time, but they can also have taken place completely within the pre-assignment or the post-assignment time. |
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Calculate paths from section |
Connection search If this option has been checked, Visum determines the connections. Stored connections for DSeg If this option has been checked, Visum does not perform connection search, but will use connections precalculated in a previous assignment instead. In the list, click the demand segments with the connections you want to read in (Fundamentals: Opening of the timetable-based assignment: Export/Import of connections). Notes All imported connections are taken into account during assignment, regardless of the defined assignment time period. When calculating a skim matrix, no skim values are calculated for OD pairs with no demand, i.e. with no paths. File If this option is selected, connections are read in from a file (Fundamentals: Opening of the timetable-based assignment: Export/Import of connections). Via the Notes Irrespectively of the specified assignment time period, the assignment will regard all connections read from file. You can also save connections to several files (Timetable-based assignment: Connection export page). Import fares
Notes This option is only provided if option File has been checked. In the connection file, fares are not stored per demand segment, i.e. for all demand segments the same fare per connection is read in from the file. If the connection file stores the fares on path leg level, the fare of the connection results from the total of the fares of the path legs. If the connection file stores the fares on path level, the fare of the connection is used without changes. Tip Fares are saved on path leg level or separately per path leg if, under Calculate > General procedure settings > PuT settings > Assignment in the Save imported fare data list, you click On path leg level (Settings for saving PuT assignment results). |
If this option has been checked, the assignment is performed.
If this option has not been checked, the assignment is not performed.
button, select the desired file in 
