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How can I display frequently traveled routes?

I think this has been asked before in a question I am unable to relocate which was about how to display multiple overlapping routes on a map, so that frequently traveled routes (with many overlaps) are bright, and single routes are dim. I believe they were trying to re-create an effect from a map they had found elsewhere, and there was an image of that map included in the question.

The answer used transparency and blending modes to create a beautiful effect, where overlapping lines appeared to glow.

The solution looked something like this, except that the lines followed roads in the basemap. They may also have been categorized with a red-yellow-green color scheme.

enter image description here

The basemap in the solution (and possibly also in the question) was a dark grayscale map, similar to ESRI Gray (dark) or CartoDB Dark Matter.

marked as duplicate by Gabriel De Luca, ahmadhanb qgis Mar 7 at 6:03

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    something like this?? – Steven Kay Mar 6 at 21:04
  • Should I delete this question now? I'm not sure if it's useful to anyone other than me. – csk Mar 6 at 21:09
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The discussion on Creating polyline-based “heatmap” from GPS tracks? has approaches based on GeoTools/GeoServer, Mapbox/TileMill, umap, QGIS, ArcGIS, and other technologies.

  • Actually the one i was looking for was this one, but I was able to get to it from the one you suggested, because they're linked. I favorited both of them so I can find them again in the future. Thank you! – csk Mar 6 at 21:06

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