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 > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
