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I need to generate isochrones for emergency vehicles. Is there any possibility of QGIS to do this? I checked TravelTime and QNEAT plugins but unfortunately, I could not find any way.

With TravelTime there is not any travel mode considering emergency vehicle speed in TravelTime plugin. Since emergency vehicles don't travel in ordinary speed limitations I need to configure the travel speed.

Do you know any other way, not only using QGIS, for generating this type of isochrone?

  • Is there an academic reason to solve this problem, or are you in charge of a local emergency agency? – DPSSpatial Oct 25 '20 at 22:17
  • Yes, there is an academic reason – Elham Oct 26 '20 at 7:51
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You can use the QNEAT plugin for that. You can select the Iso-Areas entry (accessible in the processing toolbox) and than select iso-area as contours (from Point). It creates both a raster containing isochrone information as well as vector lines, representing isochrones. See the settings I made - on the bottom, you can define a speed. There are optional settings for varying speed, then you can take the value from an attribute of the road network.

Size of iso-area is the max. distance (in time) that is calculated. It's in seconds, so my 1200 [s] represents 20 min - if you need a larger area, adjust the settings. I created contours for every 2 minutes (120 sec.). Be sure to select fastest path:

enter image description here And this is how the output looks like:

Red lines: original roads network (input) - the input point is not shown here - in the above dialogue window, you can select it by pointing to the map (use snapping to snap to a road segment).

blue lines: output of the algorithm (isochrone lines)

colored raster: output of the algorithm (isochrone raster)

enter image description here

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