GIS Tools

QAequilibraE has some tools to allow the user to visualize the data.

Desire Lines

QAequilibraE is capable of doing two types of desire lines.

It is possible to use a zone or a node layer, and one can also generate the desire lines and Delaunay lines for the demand matrix provided.

After selecting a matrix, the user can choose to un-check the use all matrices box and select which matrix layers/cores they want to use (the list of matrices will only show if the option is un-checked). Just make sure to select a zone/node layer and node id that is compatible with your matrix.

The user also needs to choose if they want Delaunay lines

or desire lines

Stacked Bandwidth

The tool for plotting link flows you just saw above can be found under the GIS menu.

You can select a link layer, including Delaunay Lines or desire lines. It is also possible to choose between solid or gradient colors.

You can also control the overall look of these bands (thickness and separation between AB and BA flows) in the project properties.

And have our map!! (You need to refresh or pan the map for it to redraw after changing the project variables)

Scenario Comparison

After joining the two assignment results (the original one and the one resulting from the forecast we just did) to the links layer, one can compare scenarios.

When joining the assignment results, make sure to name them in a way you will understand.

The scenario configuration requires the user to set AB/BA flows for the two sets of link flows being compared, as well as the space between AB/BA flows, and band width.

The user can also select to show a composite flow comparison, where common flows are also shown on top of the positive and negative differences, which gives a proper sense of how significative the differences are when compared to the base flows.

As it was the case for stacked bandwidth formatting, expert mode sets project variables as levers to change the map formatting.

And this is what it looks like

Simple tag

GIS > Simple tag works as a spatial join tool in AequilibraE that allows you to join useful information between layers.

Suppose you have a nodes layer with a ‘name’ column only with NULL values, and a zoning layer with an analogous column ‘name’ but filled with actual names. We can join the information from the zoning layer into the nodes layer using Simple tag.

We start selecting the layer and the field from which we want to import the data, and then selecting the layer and the field we want to ‘paste’ the data. Notice that depending on the operation one want to perform, not all methods are available.

Be aware that the existence of triggers in the project database might affect the performance of Simple tag.