One of the goals of GoodVision Video Insights platform is to save your time on repetitive manual tasks. If you're a traffic modeller, one of such tasks is to manually create a model of the intersection and calibrate it with the appropriate parameters in the simulation software PTV Vissim. This tasks takes hour and days of manual work and is often even outsourced.

Today, we are excited to introduce the new revolutionary feature that automates this time-consuming task when generating the network from traffic movements. It also significantly helps to eliminate the human error when copy-pasting the traffic parameter values from Excel sheets to Vissim. GoodVision creates the traffic model network for you and as a result, you' ll find the .inpx file with the calibrated model under the Traffic Exports page in a few seconds after the request.

Scene requirements

Any type of junction (x-intersection, t-intersections, highway, etc.), following the fixed camera or drone camera video requirements, is supported. Roundabout models are to be supported soon too.

How to prepare your scene before model generation

Describe your scene - define traffic movements. When placing your lines on the scene (do not use zones here), make sure to draw only a single line across the road with the multiple lanes (do not draw lines for individual road lanes if the lanes have the same direction). Finally, you will need to define the movements, which you want to include in the model in your simulation software (connect at least the entry line and the exit line). Ideally, enter a distance to each created traffic movement (learn about movement distances), which is mandatory if you want to calibrate the model by vehicle speed.

Note: Your scenarios and events cannot be selected and converted to Vissim links

Configure your future Vissim model

On the 'Describe scene' click 'Generate model' button and configure your future model:

  • Select the object classes you want to include into the model
  • Select the traffic movements that form 1 junction only at a time and which you want to convert to links in your model
  • Choose if you want to calibrate links by speed (if you select no, the default speed distributions will be applied in the model).
  • Choose the camera (survey) interval you want to analyze in the simulation - the peak hour is selected by default (you can also choose your own time range)
  • Choose the time unit which will be used to distribute volumes and vehicle compositions into the model.
  • Optionally, you can insert the latitude and longitude if you want the model to be placed on the correct location on the map in your simulation system.

After clicking the 'Generate model' button in the dialogue, the .inpx file with the generated and calibrated model will be placed to the Traffic exports page within a few minutes.

Generate Vissim model dialog box

IMPORTANT NOTE

The camera scene might be rotated or distorted based on the original camera view. When generating a model be aware that perspective and real orientation of the camera might cause distorted links which must be adjusted in Vissim as below.

OPTIONAL STEP - After opening the .inpx file, generate the spline (see below) for connectors (links), adjust the position of the prolonged links or increase the number of lanes in each link if needed (by default every link has 1 lane)

Adjusting the generated links and connectors is done in a few seconds

EXAMPLE 1 - Intersection from drone footage

In this 4-arm intersection, 12 movements were created including the distances and selected to the Vissim model configuration including the speed calibration.

As a result, you can see the generated Vissim .inpx calibrated model after the links adjustment with the exact volumes and vehicle compositions ratios distributed to 15 min. intervals. As you can see, the links also contain the names according to your setup from GoodVision Video Insights.

Vehicle inputs with volumes and vehicle distributions per 15 min. time intervals

EXAMPLE 2 - Highway footage

In this highway footage, the user has created 2 movements with distances covering both directions. These were selected to the Vissim model configuration including the speed calibration.

As a result, you can see the generated Vissim .inpx calibrated model after the rotation of the links with the exact volumes and vehicle compositions ratios distributed to 15 min. intervals of the selected peak hour.

Vehicle inputs with volumes and vehicle distributions per 15 min. time intervals

Conclusion

Vissim .inpx file model generation is a time-saver for all traffic modellers that work with the simulation software PTV Vissim on a daily basis. It eliminates possible human error when calibrating the model with many parameters that need to be otherwise inserted manually. Furthermore, with the unlimited time interval, it allows the user to create an exact digital twin of the real scene in the simulation software.

Vissim model generation is a premium feature available in the Traffic Modeller platform plan, now available to all users free for a limited period of time.

In case you have more questions or insights regarding the Vissim model generation contact us on sales@goodvisionlive.com 👍

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