Project Meeting 2017.01.20

Overview

• Clint and Ben reviewed the purpose and status of the ActivitySim project
• The purpose of this project is to prototype multiple zone system support in ActivitySim since this is the major difference between the ActivitySim example and SANDAG's model

Test Data

• We will use SANDAG's data for prototyping
• @Ben to send request to Wu; We need all data in OMX and CSV format
• OMX export not working correctly in TransCAD 7; @Ben to test and follow-up with Caliper
• If OMX export doesn't work, we will export to CSV and then convert to OMX

Follow Up

• ( Wu ) Exported OMX using GISDK script
• ( Wu ) GISDK script example

Basic Design

• Current ActivitySim skims object will become a NetworkLOS object
• Will read in the required data, for example:
  • TAZ to TAZ skims
  • TAP to TAP skims
  • MAZ to MAZ table
  • MAZ to TAP table
  • MAZ table
  • TAP table
  • TAZ table
• Will revise the expressions interface so instead of simply skims, which gets a vector of TAZ OD pair data, we'll have something like:
  • NetworkLOS.get("OTAZ","DTAZ","TIME") - vector of TAZ OD pair data
  • NetworkLOS.get("OMAZ","DMAZ","DISTANCE") - vector of MAZ OD pair data
  • NetworkLOS.get("OMAZ","BTAP","DISTANCE") - vector of MAZ to boarding TAPs data
  • etc.
• The working specification for multiple zone system support is here
• Maybe we'll have some Cython in there as well for complicated queries that need to be fast
• For transit virtual path building, performance gains often come from pre-computing total costs by path leg - maz to tap, tap to tap, tap to maz and then doing a shortest path across the graph

Project Management

• Bi-weekly calls @ 10am before the main ActivitySim call
• Project schedule is max 3 months
• Will create a branch within ActivitySim repo and turn off TravisCI and testing
• @Wu setup call and invite ActivitySim team