[GRASS-user] Obtaining unique nodes from a topology

Achim Kisseler ak7 at jupiter.uni-freiburg.de
Fri Jan 15 06:51:09 EST 2010

Hi Will,

for lines you can use

v.to.db -p map=... option=start

-p to print your result
option=start to get start points
option=end to get end points

the result looks like

without -p you can upload the results to the table with:

Hope it helps,

William Temperley schrieb:
> Hi all
> I've used Grass to build a topology out of a polygon shapefile, so far 
> so good.
> I now need to export it as an arc-node topology (i.e. boundaries  with 
> startnode_id, endnode_id) which I will then use in PostGIS.
> Does anyone know of a way to get the nodes from the topology and attach 
> these attributes to the boundaries?
> I know I can get the start/end coordinates, but I need the unique nodes 
> and their ids.
> Thanks
> Will Temperley
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