Traffic Model
Revision as of 07:57, 29 August 2017 by Vincent@tygron.com (talk | contribs) (→Traffic Models available in the Tygron Engine)
What is a Traffic Model
From Wikipedia, the free encyclopedia
- A traffic model is a mathematical model of real-world traffic, usually, but not restricted to, road traffic. Traffic modeling draws heavily on theoretical foundations like network theory and certain theories from physics like the kinematic wave model. The interesting quantity being modeled and measured is the traffic flow, i.e. the throughput of mobile units (e.g. vehicles) per time and transportation medium capacity (e.g. road or lane width). Models can teach researchers and engineers how to ensure an optimal flow with a minimum number of traffic jams.
- Traffic models often are the basis of a traffic simulation.
How does a Traffic Model relate to the Tygron engine?
- To better visualize traffic and its impact in the Tygron Engine, three traffic aspects are simulated: Traffic Flow, Traffic NO2 Pollution and Traffic Noise. The main purpose is to simulate impact of traffic on the 3D World, not to simulate the traffic logistics.
Traffic Models available in the Tygron Engine
- The Tygron Engine makes, by default, traffic based calculations for results such as the Traffic Flow overlay, the Traffic NO2 overlay and Traffic Sound Pollution overlay. These calculations are based on many different data sets. These data sets are different for each location/ country.
Data Sources
- When creating a new project based on real data in the Tygron Engine, a standard traffic flow is generated for the selected project area, based on available (open) data sources. For the Netherlands these sources are:
NSL Monitoringstool
See also: https://www.nsl-monitoring.nl/
PDOK RDW wegen
See also: https://www.pdok.nl/nl/service/wfs-nwb-wegen-nationaal-wegen-bestand
INWEVA 2015
See also: https://nis.rijkswaterstaat.nl/portalcontent/logon/p2_33.html
VI-Lucht & Geluid
See also: https://www.infomil.nl/onderwerpen/klimaat-lucht/luchtkwaliteit/slag/hulpmiddelen/inschatten/
- VI-Lucht en Geluid is een hulpmiddel dat de volgende gegevens levert over een bepaald wegvak:
- een gemiddelde verkeersintensiteit uitgedrukt in motorvoertuigen per weekdag, per gemiddeld daguur, per gemiddeld avonduur, per gemiddeld nachtuur
- het aandeel en de omvang van het middelzwaar en zwaar vrachtverkeer
- het aandeel en omvang van het autobusverkeer
How to add a Custom Traffic Model to a project
- Besides using the default traffic calculations, it is also possible to add a custom traffic model, better suited for the project case. A custom Traffic Model can be added directly as a static model, or as areas for a dynamic model.
- In order to upload a custom traffic model, it has to first be properly prepared as a Geojson file, in the correct coordinate system.
- See also: http://support.tygron.com/wiki/Geojson
Adding a Static Custom Traffic Model
- A static model does not change (over time), when changes occur in the 3D world.
- To upload a Traffic Model directly as static data, a prepared Geojson file can be dragged and dropped on the Editor window. A panel appears, where the option "Import Building Values" needs to be selected. The Geojson file has to contain an attribute named 'TRAFFIC_FLOW" (vehicles/ hour), so that constructions that are touched by sections of the traffic data, are given the value of the attribute belonging to that section.
How to add a Static Custom Traffic Model:
- Drag and drop a prepared Geojson file on the Editor
- Select "Import Building Values" from the "File Handler" panel
- Ensure the attribute TRAFFIC_FLOW is activated on the "Import Building Values File" panel
- Select the "Send" button on the same panel
- Editor.jpg
Drag and drop a prepared Geojson file on the Editor
- ImportBuildingValues.jpg
Select "Import Building Values" from the "File Handler" panel
- SelectTrafficFlowAttr.jpg
Ensure the attribute TRAFFIC_FLOW is activated
- ImportBuildingValuesFileSend.jpg
Select the "Send" button
Adding a Dynamic Custom Traffic Model
- A dynamic model changes (over time), according to changes in the 3D world.
- To create a dynamic Traffic Model, the same Geojson file can be used. In this case "Import Areas" is selected on the File Handler panel, in stead of "Import Building Values". The sections of the Traffic Model will then be assigned to the project as areas. Next an excel file can be added, for an indicator or overlay, which updates constructions dynamically. To change the Traffic Model, a TQL statement such as the following can be used:
UPDATE_BUILDING_TRAFFIC_FLOW_WHERE_AREA_IS_6
(This statement updates the attribute "TRAFFIC_FLOW" (vehicles/ hour) of constructions located in Area 6.)
- The excel implementation of a light Dynamic Traffic Model as described above, consists of the following consecutive steps:
- Retrieval of the original traffic density in Area X -
SELECT_ATTRIBUTE_WHERE_NAME_IS_TRAFFIC_FLOW_AND_AREA_IS_X
- Calculation in an excel file, with the new traffic density as outcome -
original traffic density + change
- Output of the new traffic density for constructions in Area X -
UPDATE_BUILDING_TRAFFIC_FLOW_WHERE_AREA_IS_X
- Retrieval of the original traffic density in Area X -
How to add a Dynamic Custom Traffic Model:
- Drag and drop a prepared Geojson file on the Editor
- Select "Import Areas" from the "File Handler" panel
- Ensure the attribute TRAFFIC_FLOW is activated on the "Import Areas File" panel
- Select the "Send" button on the same panel
- Editor.jpg
Drag and drop a prepared Geojson file on the Editor
- ImportAreas-FileHandler.jpg
Select "Import Areas" from the "File Handler" panel
- ImportAreaFile.jpg
Ensure the attribute TRAFFIC_FLOW is activated
- ImportAreaFileSend.jpg
Select the "Send" button