[GRASS-user] grass : how to do Isochrone maps?

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Hello, 

 I would like to make Isochrone maps with grass(time and distance
calculations) 

1 / Could you tell me how to do that with grass please? 

2 / A 'road graph' should be compulsory. Do you know where we can get one? 

In advance, thank you for your reply.



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