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PostGIS Cookbook by Bborie Park, Stephen Vincent Mather, Thomas J. Kraft, Paolo Corti

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Driving distance/service area calculation

Driving distance (pgr_drivingDistance) is a query that calculates all nodes within the specified driving distance of a starting node. This is an optional feature compiled with pgRouting; so if you compile pgRouting yourself, make sure that you enable it and include the CGAL library, a required dependency for pgr_drivingDistance.

Driving distance is useful when "user sheds" are needed that give realistic driving distance estimates, for example, for all customers within 5 miles of driving, biking, or walking distance. These estimates can be contrasted with buffering techniques, which assume no barrier to travelling and are useful for revealing the underlying structures of our transportation networks relative ...

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