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I am looking at developing catchment areas based on a street-lines feature class against various bus stops to find an ideal catchment area which can then be converted and run in a simulation. The impedance is distance over time such that a vehicle will only make it so far, by x-time. The images below show a 5,10,15-minute area. The visual aesthetic of the ArcMap representation is a bit shoddy but I just wanted to have something for comparison.

In ArcMap I am able to control the speed attribute for the network impedance using attribute table values in the Network Analysis extension. I need to somehow control QGIS interaction with the road network to 25 mph if that's possible.

  • QGIS Plugin ORS Tools (previously OSM Tools) only allows for an input classification such as 'driving-car' in the Isochrones generation filed under the Batch Jobs tab. I need to limit the speeds of the road network to 25 mph and I have not found a good way of doing this.

Comparisons shown below are using the same point in the City of San Jose, California. The QGIS image shows the point in red. I forgot to make the point visible in ArcMap. The ArcMap image is different because it is able to control for the street-speeds.

I have done several forms of research on this topic and ORS was the one tool/plugin that seemed to accomplish what I was looking for.

How can I set the speed to 25 mph using QGIS?

ArcMap

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QGIS with ORS

enter image description here

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