How to work with heatmaps in TrafficSurvey Viewer?

Visualize speed, acceleration, stationary time, object density or safety analysis through heatmap or gridmap

DataFromSky avatar
Written by DataFromSky
Updated over a week ago

Heatmaps are another way how to visualize data in your video. Thanks to heatmaps or gridmaps available in TrafficSurveyViewer (.exe) you can visualize data such as velocity, acceleration, stationary time, object density, or time to collision. 

See the description of each parameter below: 

  • Velocity – Absolute size of the object velocity vector. 

  • Total Acceleration – Absolute size of the immediate acceleration vector

  • Tangential Acceleration – Only in AERIAL mode. A positive value means acceleration and a negative value means deceleration.

  • Lateral Acceleration – Only in AERIAL mode. A positive value means acceleration to the right and a negative value means acceleration to the left.

  • Total Stationary Time – Visualizes areas where vehicles are considered stationary. For defining a stationary vehicle check Flag Dynamics Settings.

  • Object Density – Visualizes the density of occurring objects.

  • Safety Analysis To view this overlay, you must first perform a Safety Analysis. Visualizes the conflict density of the selected type of Safety Analysis.

To set your heatmap or gridmap, go to Manage Overlay option under View in the main menu or on the main panel. 

Overlay Generation Settings

Once you open Manage Overlay settings new settings window shows. In this window, you can choose what kind of data do you want to display, whether you want to display data by heatmap or gridmap, what types of objects you want to visualize, and others.

In Overlay Visualisation Settings you can set the Colour Map of the displayed overlay, transparency of displayed trajectories, and heatmap value range, which allows you to change the sensitivity of the displayed overlay.

See the difference between the visualization of speed by heatmap (left) and gridmap (right) through DataFromSky Viewer.

In the case of gridmap, you can set the size of each grid and range value for setting the sensitivity of the displayed overlay. Gridmap respects the angel of the camera and traffic as well. In case the angle between your camera and traffic is not 90°, gridmap will respect this visualization and keep real-distance in the video.

You can decide whether to show any specific value in each grid and which one. To get statistic data about specific areas choose grids, where you expect this information. New flag with this information shows. In the case of stationary gridmap, you do get average, median, minimum, and maximum stationary time within the selected region.

Visualize Time to Collisions, which is part of our Safety analysis, by heatmap or gridmap as well! By clicking each of the grid squares, you can get more statistical information about the area. By selecting more grids, get overall statistics for selected grids.

To see other visualization possibilities see the article How to visualize data in the video and How to make a visual export from DataFromSky Viewer.

We will be happy to answer any questions you may have. Contact us!

Did this answer your question?