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? 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]> > 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] > > http://lists.osgeo.org/mailman/listinfo/grass-user > >
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