Running Assignments in SeaCast

The SeaCast model uses Emme software to run network assignments. Network assignment is one of the model component that can be activated or deactivate through input configuration via parameter run_skims_and_paths. The parameters listed in next section can be configured in the input_configuration.py script to run assignment only in SeaCast model.

Parameters to run only network assignments

input_configuration.py

Open the input_configuration.py in a notepad editor and update the following parameters to the values listed in "New Setting" column to run network assignments only in SeaCast model.

Variable	Default Setting	New Setting
run_accessibility_calcs	True	False
run_setup_emme_project_folders	True	False
run_setup_emme_bank_folders	True	False
run_copy_scenario_inputs	True	False
run_import_networks	True	False
run_skims_and_paths_free_flow	True	False
run_skims_and_paths	True	True
run_truck_model	True	False
run_supplemental_trips	True	False
run_daysim	True	False
run_summaries	True	False

Running Assignments

First ensure that the input configuration is updated to run network assignment only in SeaCast model. Then make any network changes you would want before running the assignments. For that you can open the project "projects/LoadTripTables.emp" in Emme to make manual network changes as this project contains all the 12 time period emme banks. Ensure that the network changes are reflected consistently across all the time periods. Save all the banks and close out of Emme. Then do a SeaCast model run by following the instructions listing in Running SeaCast. The input configuration changes will ensure that only network assignments are run for all twelve time periods.