Origin and Destination
The O/D module allows traffic planners and consultants to assess vehicle movement patterns in areas of interest.
Trip Chaining Scenario 1
The following scenario demonstrates how each parameter may influence the results of an Origin and Destination.
| Altitude Name | API Name | Selection |
|---|---|---|
| Chaining Within Origins | tripChainWithinOrigin | True |
| Chaining Within Destinations | tripChainWithinDestination | True |
| Include Inbound Chaining | retainBackwardChainingOrigin | N/A |
| Include Outbound Chaining | retainForwardChainingDestination | N/A |
| Include Sub-Journeys | retainSubJourneys | False |
Journey (trips that comprise the journey)
| O/D Pair | No trip chaining | Trip Chaining Threshold: 10 min | Trip Chaining Threshold: 15 min | Trip Chaining Threshold: 20 min |
|---|---|---|---|---|
| X → Y | ✘ | ✔ (a, b, c) | ✔ (a, b, c) | ✘1 |
| X → Z | ✘ | ✘ | ✘ | ✔ (a, b, c, d, e, f) |
| Y → Y | ✔ (d) | ✘2 | ✘ | ✘ |
| Y → Z | ✔ (e) | ✔ (d, e) | ✔ (d, e, f) | ✘3 |
1 Journey dropped as retainSubJourneys is set to False and trips a, b, c, d, e and f are included as part of X → Z.
2 Journey dropped as retainSubJourneys is set to False and trip d is included as part of Y → Z.
3 Journey dropped as retainSubJourneys is set to False and trip d is included as part of Y → Z.
Trip Chaining Scenario 2
The following scenario demonstrates how each parameter may influence the results of an Origin and Destination.
| Altitude Name | API Name | Selection |
|---|---|---|
| Chaining Within Origins | tripChainWithinOrigin | False |
| Chaining Within Destinations | tripChainWithinDestination | False |
| Include Inbound Chaining | retainBackwardChainingOrigin | N/A |
| Include Outbound Chaining | retainForwardChainingDestination | N/A |
| Include Sub-Journeys | retainSubJourneys | False |
Journey (trips that comprise the journey)
| O/D Pair | No trip chaining | Trip Chaining Threshold: 10 min | Trip Chaining Threshold: 15 min | Trip Chaining Threshold: 20 min |
|---|---|---|---|---|
| X → Y | ✘ | ✔(b, c)1 | ✔ (b, c) | ✘ |
| X → Z | ✘ | ✘ | ✘ | ✔ (b, c, d, e)2 |
| Y → Y | ✔ (d) | ✔ (d)3 | ✔ (d) | ✘ |
| Y → Z | ✔ (e) | ✔ (e)4 | ✔ (e) | ✘ |
1 Journey does not include trip a since tripChainWithinOrigin is set to False.
2 Journey does not include trips a and f since tripChainWithinOrigin and tripChainWithinDestination are set to False.
3 Journey remains since tripChainWithinOrigin is set to False and trip d cannot be included as part of Y → Z.
4 Journey does not include trips d and f since tripChainWithinOrigin and tripChainWithinDestination are set to False.
Trip Chaining Scenario 3
The following scenario demonstrates how each parameter may influence the results of an Origin and Destination.
| Altitude Name | API Name | Selection |
|---|---|---|
| Chaining Within Origins | tripChainWithinOrigin | False |
| Chaining Within Destinations | tripChainWithinDestination | False |
| Include Inbound Chaining | retainBackwardChainingOrigin | N/A |
| Include Outbound Chaining | retainForwardChainingDestination | N/A |
| Include Sub-Journeys | retainSubJourneys | True |
Journey (trips that comprise the journey)
| O/D Pair | No trip chaining | Trip Chaining Threshold: 10 min | Trip Chaining Threshold: 15 min | Trip Chaining Threshold: 20 min |
|---|---|---|---|---|
| X → Y | ✘ | ✔ (b, c)1 | ✔ (b, c) | ✔ (b, c)2 |
| X → Z | ✘ | ✘ | ✘ | ✔ (b, c, d, e)3 |
| Y → Y | ✔ (d) | ✔ (d) | ✔ (d) | ✔ (d)4 |
| Y → Z | ✔ (e) | ✔ (e)5 | ✔ (e) | ✔ (e)6 |
1 Journey does not include trip a since tripChainWithinOrigin is set to False.
2 These journeys are included since retainSubJourneys is set to True.
3 Journey does not include trips a and f since tripChainWithinOrigin and tripChainWithinDestination are set to False.
4 These journeys are included since retainSubJourneys is set to True.
5 Journey does not include trips d and f since tripChainWithinOrigin and tripChainWithinDestination are set to False.
6 These journeys are included since retainSubJourneys is set to True.
Trip Chaining Scenario 4
The following scenario demonstrates how each parameter may influence the results of an Origin and Destination.
| Altitude Name | API Name | Selection |
|---|---|---|
| Chaining Within Origins | tripChainWithinOrigin | True |
| Chaining Within Destinations | tripChainWithinDestination | True |
| Include Inbound Chaining | retainBackwardChainingOrigin | N/A |
| Include Outbound Chaining | retainForwardChainingDestination | False |
| Include Sub-Journeys | retainSubJourneys | False |
Journey (trips that comprise the journey)
| O/D Pair | No trip chaining | Trip Chaining Threshold: 10 min | Trip Chaining Threshold: 15 min | Trip Chaining Threshold: 20 min |
|---|---|---|---|---|
| X → Y | ✘ | ✔ (a, b, c) | ✔ (a, b, c) | ✘1 |
| X → Z | ✘ | ✘ | ✘ | ✘ |
| Y → Y | ✔ (d) | ✘2 | ✘ | ✘ |
| Y → Z | ✔ (e) | ✔ (d, e) | ✘3 | ✘ |
1 Journey does not exist because the retainForwardChainingDestination parameter is set to False, so if the last trip leaves the destination, Zone Y, below the Trip Chaining Threshold, the entire journey is dropped.
2 Journey does not exist because retainSubJourneys is False, tripChainInOrigin is True, and the trip d is included in the larger Y → Z journey.
3 Journey does not exist because the retainForwardChainingDestination parameter is set to False, so if the last trip leaves the final destination, Zone Z, below the Trip Chaining Threshold, the entire journey is dropped.
Trip Chaining Scenario 5
The following scenario demonstrates how each parameter may influence the results of an Origin and Destination.
| Altitude Name | API Name | Selection |
|---|---|---|
| Chaining Within Origins | tripChainWithinOrigin | True |
| Chaining Within Destinations | tripChainWithinDestination | True |
| Include Inbound Chaining | retainBackwardChainingOrigin | False |
| Include Outbound Chaining | retainForwardChainingDestination | N/A |
| Include Sub-Journeys | retainSubJourneys | False |
Journey (trips that comprise the journey)
| O/D Pair | No trip chaining | Trip Chaining Threshold: 10 min | Trip Chaining Threshold: 15 min | Trip Chaining Threshold: 20 min |
|---|---|---|---|---|
| X → Y | ✘ | ✔(b, c) | ✘1 | ✘ |
| X → Z | ✘ | ✘ | ✘ | ✘2 |
| Y → Y | ✔ (d) | ✘3 | ✘ | ✘ |
| Y → Z | ✔ (e) | ✔ (d, e, f) | ✔ (d, e, f) | ✘4 |
1 Journey does not exist because the retainBackwardChainingOrigin parameter is set to False, the stop duration prior to trip b is below the Trip Chaining Threshold, and the trip prior (a) started outside the zone.
2 Journey does not exist because the retainBackwardChainingOrigin parameter is set to False, the stop duration prior to trip b is below the Trip Chaining Threshold, and the trip prior (a) started outside the zone.
3 Journey dropped as retainSubJourneys is set to False and trip d is included as part of Y → Z.
4 Journey does not exist because the retainBackwardChainingDestination parameter is set to False, the stop duration prior to trip d is below the Trip Chaining Threshold.