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You have to prepare the network first. 

Use the v.clean from GRASS https://grass.osgeo.org/grass77/manuals/v.clean.html from GRASS with the breakbreak option to create the intersections. Then

Then you can run the v.net.isov.net.iso.

You have to prepare the network first. Use the v.clean from GRASS https://grass.osgeo.org/grass77/manuals/v.clean.html with the break option to create the intersections. Then you can run the v.net.iso.

You have to prepare the network first. 

Use the v.clean from GRASS with the break option to create the intersections.

Then you can run the v.net.iso.

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muri
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You have to prepare the network first. Use the v.clean from GRASS https://grass.osgeo.org/grass77/manuals/v.clean.html with the break option to create the intersections. Then you can run the v.net.iso.