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See Anita's demo here: http://anitagraser.com/2013/07/07/public-transport-isochrones-with-pgrouting/ It will require pgRouting


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It's a bit difficult to answer your question without further details, but drawing isochrones is a relatively frequent (and complex) issue. QGIS alone (including its plugins) does not provide a simple way to compute isochrones. A common solution is to use a PostGIS database along with pgRouting. You can refer to these posts in GIS SE: Drawing isochrones on ...


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Instead of tracing you could try this Polygon to Centerline tool: http://www.arcgis.com/home/item.html?id=bc642731870740aabf48134f90aa6165 I have heard some people have had problems with it and others have gotten it to work just fine but it might be worth a shot and save you a lot of time instead of tracing. There is also a tool called Collapse Polyline ...


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I am a bit late to the party here. But you can use Grasshopper API - They have a matrices component that you can work within called the Matrix API There is also Mapzen Leaflet Routing Plugin or the Mapzen Valhalla engine as well as Mapbox Distance API which you can tap into the


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To make this an answer for others: Here those roads are called Frontage Roads. So the road that runs along side I-35 is simply I-35 NB Frontage for the northbound, SB for the southbound. I am not sure if that is a universal naming method or not. Since you are using a road network you will need to give the roads proper classification and possibly ...



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