On 27/09/17 21:03, Markus Metz wrote:
On Wed, Sep 27, 2017 at 4:07 PM, Moritz Lennert
<[email protected] <mailto:[email protected]>> wrote:
>
>
>
> Le 27 septembre 2017 13:11:54 GMT+02:00, Johannes Radinger
<[email protected] <mailto:[email protected]>> a écrit :
> >Hi,
> >
> >I have a GRASS vector network that represents a river network (with
> >many
> >first order tributaries) and that has additional connected nodes that
> >represent sampling sites.
> >
> >I'd like to extract a minimum subnetwork of the full network that still
> >connects a set of selected nodes (e.g. identified by their cat).
> >However,
> >network edges (i.e. river segments) that are not necessary to connect
> >the
> >sampling points should be excluded in the new subnetwork. Is there a
> >function or process in GRASS GIS to extract such a subnetwork that
> >fully
> >connects a set of selected nodes?
>
> not sure but maybe v.net.spanningtree ?
v.net.spanningtree calculates a tree covering all nodes in the network,
not only selected nodes, therefore v.net.spanningtree does not apply here.
If you connect only the selected nodes to the network, wouldn't that
work ? Or does v.net.spanningtree consider all connections between lines
as nodes ?
Moritz
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