[GRASS-user] Re: Drivetime Isochrones

[RKiTect]

i think i have figured out where my problem lies. It is in the centre node
costs... from the manual is says right at the top that centre node must be
opened (costs >= 0). however i have not defined costs for the centre node at
any point... could this be the issue? how do i go about defining costs for
the centre node?

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