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I have the number of travels from one city to nearby cities. I already created centroids for all of these cities.

And I want to create a map connecting this cities (by lines) and to give those line weight according to number of travels.

How do I create this lines? How do I make the connection between different cities - Table of attributtes?

In summary, I want to end up with something like this map: enter image description here

1

I would highly recommend you download the FlowMapper plugin for QGIS in order to achieve this. You will need to manipulate the data a little as the plugin accepts 3 .txt files:

  1. Contains your node coordinates (your Centroid Coordinates).
  2. Your node names (your Centroid Names).
  3. A flow matrix containing your number of travels to each centroid.

From this you easily have the ability to add weighted symbology to each path.

This webpage gives a very good guide on how to achieve what you want:

https://gogeomatics.ca/mapping-migration-flows-with-qgis-flowmapper-plugin/

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Actually, i had no experience in QGIS. But it is possible to do this on ArcGIS using a route analysis model. This is a link if it helps. http://desktop.arcgis.com/en/arcmap/latest/extensions/network-analyst/exercise-6-creating-a-model-for-route-analysis.htm. This is going to be done using your road network and location data in your case centroids. But first, you should change your road data into a road data network dataset. which will be an input for the route layers. If you want to preserve distance and time you should also provide time, speed and distance information a within the road attribute tables. but if you just want to show the road networks the model will help.

Thanks, Tamene

  • 1
    While your answer may be the correct way to do this in ArcGIS, this does not provide an answer for the OP since OPis asking for a solution in QGIS not in ArcGIS – LaughU Nov 21 '17 at 12:37

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