Center nodes have to be assigned to vector nodes. Nodes and arcs can be closed using cost = -1.
# Spearfish # start node: echo "591280.5|4926396.0|1" | v.in.ascii out=startnode g.copy vect=roads,myroads #connect point to network v.net myroads points=startnode out=myroads_net op=connect thresh=200 g.region vect=myroads_net d.mon x0 d.vect myroads_net d.vect myroads_net col=red icon=basic/triangle fcol=green size=12 layer=2 v.category myroads_net layer=2 op=print # specify range of center cats (easier to catch all): v.net.iso input=myroads_net output=myroads_net_iso ccats=1-100000 costs=1000,2000,5000 v.category myroads_net_iso option=report # ... reports 4 categories:
cat | distance from point 1 0 - 1000 2 1000 - 2000 3 2000 - 5000 4 > 5000
g.region n=4928200 s=4922300 w=589200 e=596500 d.erase d.vect myroads_net_iso d.vect myroads_net_iso col=blue cats=1 d.vect myroads_net_iso col=green cats=2 d.vect myroads_net_iso col=orange cats=3 d.vect myroads_net_iso col=magenta cats=4 d.vect myroads_net col=red icon=basic/triangle fcol=green size=12 layer=2
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