On Thu, Mar 31, 2011 at 2:54 PM, Maris Nartiss <[email protected]> wrote:
> Hello, > 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. > > That is exactly what I did. In fact in my first message I wrote "My idea was to run v.db.addtable to create a new empty attribute table, then v.category to assign cat numbers and the v.to.db to compute and add to the attribute table the parameter I need (ie the length). The problem is that when I run v.category nothing happens, and the attribute table remains empty." cheers andrea > Maris. > > > 2011/3/31, Andrea Pogliaghi <[email protected]>: > > Hi Maris, > > > > On Thu, Mar 31, 2011 at 10:25 AM, Maris Nartiss <[email protected]> > 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 <[email protected]>: > >> > 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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