just to make it clearer.... if I do the above steps with v.delaunay, then I create the table with v.db.addtable and then I run v.category, it works fine. If I do the same steps with v.delaunay with the -l flag (and I have to, since I need the lines), then it doesn't.
cheers Andrea On Thu, Mar 31, 2011 at 4:37 PM, Andrea Pogliaghi < [email protected]> wrote: > 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 >> >> > >> >> >> > >> > >
_______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
