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One of the features most sorely missed in QGISRed was the ability to display the temporal evolution of any of the dynamic variables contained in the results. This is a very useful and common query, offered by most network analysis applications.
To address this, a new option has been added to the Calculate menu called Time Series, which opens a view of the application designed to display the various time series curves. These are shown in a dedicated new panel, which by default is stacked below the map.
Clicking on any element highlights it on the map and automatically displays the time-series curve for the associated measure currently selected in the results panel. Clicking on another element refreshes the curve.
QGISRed also allows several curves to be overlaid on the same graph. If the magnitude is not changed, all of them will be referenced to the same axis, which is automatically rescaled. Furthermore, a legend is displayed at the side of the graph, showing the default names of the different curves and the default colours assigned to them. All the elements consulted are highlighted on the map. A slider allows you to display the value of all the curves for the selected time.
But the capabilities of this QGISRed tool go further, allowing curves of different scales to be overlaid on the same graph. For the second variable, the right-hand vertical axis is used, and if there are more than two variables, an attempt is made to overlay different variables on the same axis. In this way, it is possible to compare, for example, the level of a tank with the status of the pump supplying it, or the pressure at a node against its demand.
The graph panel offers further navigation options, allowing you to customise the appearance of the graph and the curves, or to export them. You can also display the numerical values of the curve data points in table format. All these features will be covered in detail in a future tutorial.