On 24/02/14 18:58, Michel Wortmann wrote:
Thanks for your help Markus, see below.
On 02/23/2014 11:32 PM, Markus Neteler wrote:
On Fri, Feb 21, 2014 at 3:06 PM, Michel Wortmann
<[email protected]> wrote:
Hi list,
I have some (basic) vector related questions:
After cleaning a vector map, it doesnt have continuous (i.e. no gaps in
numbering) categories, how do I efficiently reset these to so that
they have
regular increments (i.e. 1) again? r.clump does something very
similar with
vectors. I have tried dropping and adding a new table, deleting and
adding
categories with v.category. I thought v.reclass may do the trick but I'd
first need a column with continuous numbers for that.
Hi Michel,
perhaps using v.category on layer=2 would to the trick to add new
categories?
This doesnt seem to do the trick for me. I've resorted to the somewhat
ungraceful quickfix of converting it to raster and back to vector again
until I come across a better solution.
What exactly is the problem with the result of v.category ?
Note that v.category does not update the table, it just updates the
category values of your vector features, with the danger of losing the
connection to the attributes.
One way to go to keep the same attributes would be to add a column to
your attribute table with continuous numbers and then use v.reclass to
create a new vector map with these numbers as category values.
If you don't care about the attribute table, you could do this:
v.category YourMap op=del out=tempmap type=TheFeatureTypeYouWantoToUse
v.category tempmap op=add out=finalmap type=idem
Then if you want to create a new attribute table for that map:
v.db.addtable finalmap
Moritz
Moritz
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