Data Processing: travel time and distance skims by time of day

[ColSmith76]

Model is using Zone17 zone system with range of TAZs from 1 to 3632. Need travel time and distance skims by time of day from CMAP either in OMX matrix format (one omx or multiple with matrics for travel time and distance by time period) or text list format, e.g. csv format, in i, j, time period (label), time (minutes), distance (miles) format.

• add time period definitions to convert from minutes to time periods in BASE_VARIABLES
• add import code to cv_sim_process_inputs.R depending on format.

@nrferguson we don't have travel time and distance skims for the zone17 system. Please could you provide those? Ideally by model time period. If available it'd be helpful to see free flow and final iteration (congested) skims to see how different they are. If you have model time period skims, please can you send the definitions of the time periods (start and end times of each period)

[ColSmith76]

Readme received with the skims:

2019 base year truck time, distance, and toll skims by time of day

ltruck - b-plate truck + light truck mtruck - medium truck htruck - heavy truck ff - free-flow cng - congested p1 - 8 pm to 6 am p2 - 6 am to 7 am p3 - 7 am to 9 am p4 - 9 am to 10 am p5 - 10 am to 2 pm p6 - 2 pm to 4 pm p7 - 4 pm to 6 pm p8 - 6 pm to 8 pm

[ColSmith76]

skim processing code is complete now, only remaining issue is use of vehicle type specific skims in the rest of the model. Two files are produced by the skim processing code:

1. skims_tod.rds which is currently just the light vehicle skims by time of day and average distance/time/toll
2. skims_tod_vehice.rds which is the vehicle specific skims, with a field denoting light, medium,, and heavy trucks, with skims by time of day and average distance/time/toll