Traffic Model: Difference between revisions

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== Add a Custom Traffic Model==
== Add a custom traffic model==
Besides using the default traffic data, 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|areas]] for a dynamic model.
It is also possible to creata and add a custom traffic model, better suited for your use case. The traffic model can be either a static model (the model and data do not change in the project) or a dynamic model (the model and data change when something in the 3D world changes).


In order to upload a custom traffic model, it has to first be properly prepared as a Geojson file, in the correct coordinate system.
===Static traffic model ===
 
''See also: [http://support.tygron.com/wiki/Geojson Geojson]
 
===Static Custom Traffic Model ===
''A static model does not change (over time), when changes occur in the 3D world.   
''A static model does not change (over time), when changes occur in the 3D world.   
 
This type of model can be used when you for example have a scenario for 2030 ready that contains the traffic intensities then and want to use this data in your project.
To upload a Static Custom Traffic Model directly as static data, a prepared Geojson file can be dragged and dropped on the [[Editor|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.
To upload the dataset, create a [[Geojson]] file of the data and make sure the features contain an attribute with the number of [[units]]/hour. This attribute will overwrite the current TRAFFIC_FLOW attribute of the roads.
When importing this data, [[Constructions]] that are intersected by sections of the imported data are given the new traffic flow attribute of imported data.
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{{Editor steps|title=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 steps|title=add a static 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}}
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===Dynamic Custom Traffic Model ===
===Dynamic traffic model===
 
''A dynamic model changes (over time), according to changes in the 3D world.
''A dynamic model changes (over time), according to changes in the 3D world.
 
An example of a dynamic traffic model is a model in where is calculated how the traffic intensity changes when building a certain amount of houses. Effectively the TRAFFIC_FLOW attribute of the roads will be updated with a new value, when building houses in the {{software}}.
To create a Dynamic Custom Traffic Model, the same Geojson file can be used. In this case "Import Areas" is selected on the File Handler panel, instead of "Import Building Values". The sections of the Dynamic Custom Traffic Model will be added to the project as areas.<br>
To create such a model, first create a [[Geojson]] file with the roads that will be changed by a certain [[Action]] and import the file.
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In an [[Excel|Excel]] file, the calculation for how much and when the traffic intensity changes has to be made. This file can be uploaded as either an [[indicator]] or [[panel]]. The indicator or panel explanation text in this case is not relevant. The Excel is only used to define the model and import it in the {{software}}.  
An [[Excel|Excel]] file can be added, for example as an [[indicator]] or [[panel]], which updates [[Constructions|constructions]] dynamically. A panel is preferable because it does not always have to be made available to the user. More detailed examples of excel indicators that use the traffic model are the [[Traffic NO2 (Indicator)]] and the [[Traffic Noise (Indicator)]]. To change the Dynamic Custom Traffic Model, a [[TQL]] statement such as the following can be used:
The Excel implementation of a simple dynamic traffic model, consists of the following consecutive steps:
 
 
:<code>UPDATE_BUILDING_TRAFFIC_FLOW_WHERE_AREA_IS_6</code> ''(This statement updates the attribute "TRAFFIC_FLOW" (vehicles/ hour) of constructions located in Area 6.)
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The excel implementation of a light Dynamic Custom Traffic Model as described above, consists of the following consecutive steps:
:* Retrieval of the original traffic density in Area X - <code>SELECT_ATTRIBUTE_WHERE_NAME_IS_TRAFFIC_FLOW_AND_AREA_IS_X</code>  
:* Retrieval of the original traffic density in Area X - <code>SELECT_ATTRIBUTE_WHERE_NAME_IS_TRAFFIC_FLOW_AND_AREA_IS_X</code>  
:* Calculation in an excel file, with the new traffic density as outcome - <code>original traffic density + change</code>
:* Calculation in an excel file, with the new traffic density as outcome - <code>original traffic density + change</code>

Revision as of 13:59, 16 November 2018

Please note: This page is currently being updated.

Template:Learned

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).

How does a Traffic Model relate to the Tygron Platform?

The main purpose of the default traffic model in the Tygron Platform is to calculate the effects of traffic on the 3D World through traffic densities. In order to calculate this impact, data such as the number of traffic lanes, the traffic speed and the traffic flow on a particular lane can be added to the project. The traffic model is a static model that does not change by carrying out Actions, Upgrades or Measures for example. Read below how to create your own dynamic traffic model and use it in the Tygron Platform.

The right panel shows details about the selected road part

The following overlays show data from/effects of the traffic model:

Datasets

When creating a new project a traffic model is generated for the selected project area, based on available open data sources. The following datasets are used:

Add a custom traffic model

It is also possible to creata and add a custom traffic model, better suited for your use case. The traffic model can be either a static model (the model and data do not change in the project) or a dynamic model (the model and data change when something in the 3D world changes).

Static traffic model

A static model does not change (over time), when changes occur in the 3D world. This type of model can be used when you for example have a scenario for 2030 ready that contains the traffic intensities then and want to use this data in your project. To upload the dataset, create a Geojson file of the data and make sure the features contain an attribute with the number of units/hour. This attribute will overwrite the current TRAFFIC_FLOW attribute of the roads. When importing this data, Constructions that are intersected by sections of the imported data are given the new traffic flow attribute of imported data.

How to add a static traffic model:
  1. Drag and drop a prepared Geojson file on the Editor
  2. Select "Import Building Values" from the "File Handler" panel
  3. Ensure the attribute TRAFFIC_FLOW is activated on the "Import Building Values File" panel
  4. 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

Dynamic traffic model

A dynamic model changes (over time), according to changes in the 3D world. An example of a dynamic traffic model is a model in where is calculated how the traffic intensity changes when building a certain amount of houses. Effectively the TRAFFIC_FLOW attribute of the roads will be updated with a new value, when building houses in the Tygron Platform. To create such a model, first create a Geojson file with the roads that will be changed by a certain Action and import the file. In an Excel file, the calculation for how much and when the traffic intensity changes has to be made. This file can be uploaded as either an indicator or panel. The indicator or panel explanation text in this case is not relevant. The Excel is only used to define the model and import it in the Tygron Platform. The Excel implementation of a simple dynamic traffic model, 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


How to add a Dynamic Custom Traffic Model:
  1. Drag and drop a prepared Geojson file on the Editor
  2. Select "Import Areas" from the "File Handler" panel
  3. Ensure the attribute TRAFFIC_FLOW is activated on the "Import Areas File" panel
  4. 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

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