LEGION Model Builder Help

Adding a scenario

As mentioned above, each model must have a Base Scenario, which is viewable in the Object Directory and the Scenario Manager. The Base Scenario is automatically generated by the software as you add objects and demand data to your model.

This procedure describes how to add another scenario to a model alongside the Base Scenario.

Parent topic: Scenario Manager

To add a scenario:

  1. Click or select Data > Scenario Manager to display the Scenario Manager, which will already contain the Base Scenario.
  2. Click the Add button.

    The ‘Add Scenario’ dialog box is displayed.

  3. Enter a name for the new scenario in the Name box.
  4. From the Based Upon drop-down menu, select the existing scenario you want to base this new scenario on.
  5. From the Modification Type drop-down menu, select the type of data modification you want to apply to the demand data in the original scenario:
    • None – no new Data Profiles are created and the initial population of any Populated Zones or Evacuation Zones is unchanged (if you select this option, click OK now, as you do not need to make any further changes).
    • Global – this applies specified changes to all Data Profiles, Populated Zones and Evacuation Zones in the original scenario.
    • Advanced – this lets you apply specified changes to one or more Data Profiles, Populated Zones and/or Evacuation Zones in the original scenario (see "To apply Advanced Modifications when adding a scenario" below for full details).
  6. If you selected Global modification:
    • Check the All arrival profiles box and enter a percentage value in the % of original box (this will change all original Data Profile data by the percentage applied - 50% will halve all values, 200% will double all values, etc.).

    and/or

    • Check the Apply over interval box and enter Start and End times to specify a time-range within which you want these data modifications to be applied.
    Note: When creating a scenario, it is not possible to use Profiles or Types previously imported from the LEGION Data Template. If you want to use previously imported Profiles or Types, you will need to edit the scenario, manually (see the next chapter).
    Note: Setting a time-range is useful for modelling evacuations or events like the closure of all Entrances for a set period (this would involve setting the Data Profile to 0% for the time range).
  7. If you want to change the values of any Populated Zones or Evacuation Zones, check the All populated and evac zones box and enter a percentage in the % of original box.
  8. Click Apply or OK to apply your changes and create the new scenario.

To apply Advanced Modifications when adding a scenario:

The following procedure describes how to apply modifications when you have selected the ‘Advanced’ option while adding a scenario.

  1. From the Modification Type drop-down menu, select Advanced.

    The 'Data Profiles' portion of the dialog box displays a list of Arrival or Event Profiles used by the original scenario and the 'Initial Population' portion displays details of any Populated Zones or Evacuation Zones.

  2. Tick the box to the left of any Arrival or Event Profile you want to modify.
  3. Double-click Percentage, Start Time and End Time and enter new values for each Arrival or Event Profile.
  4. Tick the box to the left of any Populated/Evacuation Zone you want to modify.
  5. Double-click Percentage and enter a percentage value to change the population of any Populated Zones or Evacuation Zones.
  6. Click Apply or OK to apply your changes and create the new scenario.