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Zonal data
smart-fm edited this page Nov 9, 2018
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Preday model uses the following socio-demographic data for generating activity schedules.
- Traffic Analysis Zones (TAZ)
- AM, PM and off-peak (OP) skim matrices
- departure and arrival time dependent TAZ-TAZ travel times for public transit and private vehicles interpreted from the skim matrices
Our socio-demographic data are (mostly) kept in the Simmobility database in the demand schema. The table structures are described below.
| column | description |
|---|---|
| zone_id | taz id |
| zone_code | zone code assigned by LTA |
| area | area of the TAZ in |
| population | population in the TAZ |
| shop | number of shops within the TAZ |
| central | whether this TAZ in a central zone |
| parking_rate | parking rate in the TAZ |
| resident_workers | number of working individuals residing in the TAZ |
| employment | number of employed people in the TAZ |
| total_enrollment | number of students enrolled in schools within the TAZ |
| resident_students | number of students residing in the TAZ |
| cbd | whether this TAZ is in the central business district |
| column | description |
|---|---|
| origin_zone | origin taz code |
| destination_zone | destination taz code |
| distance | distance between the zones in km |
| car_cost_erp | Electronic Road Pricing cost between the zones |
| car_ivt | in vehicle car travel time in hours between the zones |
| pub_ivt | in vehicle public transit travel time in hours between the zones |
| pub_walkt | Public Transit (PT) access/egress walk time in hours between the zones |
| pub_wtt | public transit waiting time in hour between the zone |
| pub_cost | public transit cost between the zones |
| avg_transfer | average number of PT transfers between the zones |
| pub_out | public transit out of vehicle travel time in hours |
There are two tables in the Simmobility database in the demand schema holding TAZ-TAZ departure and arrival based travel times for every TAZ pair for each of the 48 30-minute intervals in the day. The table tcost_car holds private vehicle travel times and the table tcost_bus holds public transit travel times.