Thank you Moritz for clarification... ...I also issued an enhancement ticket for v.extract to include a new output_layer parameter (https://trac.osgeo.org/grass/ticket/3700#ticket)
/J On Wed, Nov 28, 2018 at 8:26 AM Moritz Lennert <mlenn...@club.worldonline.be> wrote: > > > Am 27. November 2018 20:51:37 MEZ schrieb Johannes Radinger < > johannesradin...@gmail.com>: > >Hi all, > > > >this is maybe I quite easy routine for somebody that is using v.extract > >regularly. > > > >Here my challenge: I have a vector map (initially created by v.net > >tools) > >that has several layers and associated tables to each layer. Now for > >further processing I want to extract only some features from layer=2 > >and > >the corresponding attribute table. > > > >I can do that using "v.extract input=mymap1 layer=2 where='mycol=x' > >output=mymap2". The resulting 'mymap2' has an attribute table connected > >to > >layer 2 and there are no other layers (e.g. there is no layer 1, which > >is > >considered in most grass tools as default layer). So I wanted to change > >that and to shift layer 2 (and the attribute table) to layer 1 using > >"v.category option=chlayer layer='2,1' input=mymap2 output=mymap3" > > > >...however, this does not change the attribute table connection (as > >checked > >by "v.db.connect -p "). So I guess I also have to use v.db.connect in > >some > >way (??) to get the attribute table shifted from connection at former > >layer > >2 to layer 1 (unused). > > Yes: > > v.db.connect -d layer=2 > v.db.connect layer=1 table= > > > > > >In my opinion this is quite a bit complicated, considering that I just > >wanted to extract some features from a 3-layered map?? Is there a > >easier > >way or a general description if one want to extract some feature that > >are > >not stored in layer 1? > > The best would probably be some form of output_layer parameter in > v.extract, probably with a default of 1. Worth a trac ticket I think. > > Moritz >
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