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This is a great post highlighting available solutions. We went the OSM pgRouting approach for drive time / distance polygons and packaged it up into a service that we are using with our premium Google Maps extension. I am happy to share how we built it if you are interested. Happy to spread the knowledge. Here is how we ultimately packaged it up. ...


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I'm also on OSX Yosemite using QGIS and GRASS, the GRASS shell in QGIS doesn't start, but it's hard to use anyways (It's hard to copy-paste, the font is hard to read and there is no cursor or command history). I start GRASS in the OSX Terminal, doing all analysis there, while I use GRASS in QGIS to export shapefiles into the GRASS database, and to load them ...


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Point Distance tool will give you distance from one point to all points in a given search radius. Then you can use the output to see concentreated areas with certain visualization tools such as "Quantities" or cut-off some points by using definition query. If you have a network graph then you can use OD Cost Matrix tool.


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Have you tried this tool: Standard Distance? !


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This is a simplistic example of using googles driving directions.



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