Traffic (network) flow
The traffic flow visualization shows the bi-directional flow of traffic through a road network, with the width and color of the rendered line indicating the number of cars using each of the routes, as well as their direction of travel, shown by the gradient along the line (transparent to opaque). In this visualization, the color ranges from purple (indicating relative low counts) to white (indicating relative high counts). The Data Explorer uses a color spectrum based on the range of values for the selected data points for the property, rather than the using the spectrum for the range of values present for that property in the data layer.
Visualizing rush hour traffic around Cambridge
Say, for example, that you have been collecting data from the Automatic Number Plate Recognition (ANPR) cameras located on the routes into Cambridge. You might want to know:
Which routes into the city become most congested during the morning rush hour?
By creating a line geometry layer for your road network, configuring it to show the Network flow, and combining it with the traffic flow data, you can show the data points from the ANPR cameras as a traffic flow visualization. This shows you which routes have the greatest volume of traffic. Combining this visualization with an animated time of day chart (Time-of-day chart) enables you to see how the traffic flows change through the rush hour period, enabling you to make informed decisions about how to manage the traffic around the city.
Showing the total or average values traffic flows
While using the traffic flow mode, for any continuous numeric properties, you can visualize the average or total colored by value.
Use the color-by-value button to select the continuous numeric property, and then select either the average or total value.
Visualizing the average journey time across Cambridge
As well as finding out how much traffic is flowing through the city during the morning rush hour, you might also decide to use the ANPR to see how long, on average, journeys across the city take.
What is the average journey time across Cambridge during the morning rush hour?
By combining the road network line geometry with the data from the ANPR, you can see the slowest average journeys. Data Explorer colors the journey according to their average values, providing you with a map-based visualization of journey times. Clicking on a specific route opens a pop-up that show you the summary statistics for the selected road segment.