[GRASS-user] v.delaunay and v.category problem

Maris Nartiss maris.gis at gmail.com
Thu Mar 31 08:54:32 EDT 2011

You have to connect Your vector map to database at first. Go to
Databases->Manage database->New table (v.db.addtable) and run
v.category afterwards.


2011/3/31, Andrea Pogliaghi <andrea.pogliaghi at gmail.com>:
> Hi Maris,
> On Thu, Mar 31, 2011 at 10:25 AM, Maris Nartiss <maris.gis at gmail.com> wrote:
>> Hello,
>> as attributes belong to triangle froming nodes, how should output look
>> like? Every triangle should get all three atributes? And what about
>> lines? Two attributes, as every triangulation line has two nodes at
>> their end?
>> It makes sense that no attribute is associated to v.delaunay lines output
> because the features (lines in my case as I'm using the -l switch) are
> different from the nodes (even if having an output attribute table
> containing, for instance, the attributes of the two nodes of each line would
> be useful), but that is not the point.
> The issue I'm facing is that I want to create a new attribute table for
> these delaunay_lines with a new unique cat value for every line and compute
> the length of each line, as I need to know which is their min, max and avg.
> Cheers,
> Andrea
>> Maris.
>> 2011/3/30, Andrea Pogliaghi <andrea.pogliaghi at gmail.com>:
>> > Hi all,
>> > ...
>> > Basically I run v.delaunay with the -l option to get lines instead of
>> > the
>> > polygons, I get the resulting vector, but there is no attribute tables
>> > associated to it.
>> > ...
>> > Ing. Andrea Pogliaghi
>> > Milano - Italy
>> >

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