Thanks, that did the trick. I guess, in order to get a consecutive "cat", I do have to reclass (v.reclass) the vector- or is there any shortcut?
Sorry for the noise, but vector stuff in grass is still a bit confusing to me. Cheers, Stefan On Fri, 2012-08-17 at 11:38 +0200, Moritz Lennert wrote: > On 16/08/12 20:23, Stefan Luedtke wrote: > > That helped for my general understanding, thanks a lot, but I can not > > figure out how. > > > > Can anyone just give a few hints on the procedure, basically, how to > > continue after "v.clean", please? > > You could try using v.extract with something list list=1-9999 in order > to create a new vector file which contains only those polygons (and > their attributes in the table) which exist in your cleaned file. > > Moritz > > > > > Cheers, > > > > Stefan > > > > On Thu, 2012-08-16 at 16:29 +0200, Markus Metz wrote: > >> On Thu, Aug 16, 2012 at 1:10 PM, Stefan Luedtke<[email protected] > >> <mailto:[email protected]>> wrote: > >> > Dear friends, > >> > > >> > I am struggling with the following point. > >> > > >> > I have created a shape of subbasins based on a raster data set. Since > >> > this > >> > yields some tiny (pixel size) areas, I run"v.clean" with a certain > >> > threshold to remove/append those artifacts. However, the resulting > >> > vector > >> > data set still holds all categories of the old one, even so, some areas > >> > have > >> > been removed. > >> > >> This is because several areas can belong to the same category, e.g. > >> basin id, and the category of a deleted area may still be used by > >> another, existing area. BTW, it is not uncommon that one raster basin > >> is represented by several vector areas. > >> > > >> > So my question: How can I update these values that the number of > >> > categories > >> > matches the number of areas? > >> > >> You can delete the table and create a new table. Otherwise, entries in > >> the attribute table that are no longer used do not do harm. > >> > >> HTH, > >> > >> Markus M > >> > >> > > >> > I tried v.category (but der is not update function). > >> > > >> > Cheers, > >> > > >> > Stefan > >> > > >> > _______________________________________________ > >> > grass-user mailing list > >> > [email protected] <mailto:[email protected]> > >> > http://lists.osgeo.org/mailman/listinfo/grass-user > >> > > > > > > > _______________________________________________ > > grass-user mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/grass-user > >
_______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
