[GRASS-user] [GRASS-dev] vector patching frustration

[Vincent Bain]

Hello Michael,
do you mean that you cannot assign a different cat number to the
specific area you added, i.e. it has a cat number assigned ? I guess
you tried the "sum" option of v.category.

But are you sure that the new area actually has a category attached to
? (else you could achieve it with v.edit and its "catadd" tool, knowing
the record number of the feature you want to cat).

Hope I understood your issue,

Vincent.

Le mercredi 13 mars 2024 à 23:02 +0000, Michael Barton via grass-dev a
écrit :
> I am completely stymied in my attempt to do what should be a simple
> task. I have a map of vector areas, linked with an attribute table. I
> would like to patch in one more vector area, for which I have
> equivalent attribute information. I have tried this multiple ways and
> I cannot make this patch happen so that the added area has attribute
> info. 
> 
> The closest I've come is to create and link a one line table to the
> new area that has exactly the same fields as the larger vector area
> map. The first map has 154 areas (i.e., cat=1-155). When I patch the
> maps and look at the resulting attribute table, I indeed see line and
> cat 155. But it is not linked with the patched area--which has been
> assigned a cat=183 for reasons I cannot fathom. The patch also
> renumbers my cat field to cat=2-155 from the original 1-154. 
> 
> This has been made more complicated by the fact that v.in.ogr imports
> all columns of a *.csv as text, regardless of what is in them and
> assigns cat numbers starting at 1. So I can't specify an integer key
> field of 155 to try the linking. Nor can I change the assigned cat of
> the single area I am trying to patch from 1 to 155 using v.category
> (or anything else I can find). 
> 
> I'm hoping that someone has a clever solution that I've not seen or
> I'll just have to do this fairly simple and straightforward vector
> operation in QGIS. 
> 
> Michael
> _____________________________
> C. Michael Barton
> Associate Director, School of Complex Adaptive
> Systems (https://scas.asu.edu)
> Professor, School of Human Evolution & Social
> Change (https://shesc.asu.edu)
> Director, Center for Social Dynamics &
> Complexity (https://complexity.asu.edu)
> Arizona State University
> Tempe, AZ 85287-2701
> USA
> 
> Executive Director, Open
> Modeling Foundation (https://openmodelingfoundation.github.io)
> Director, Network for Computational Modeling in Social & Ecological
> Sciences (https://comses.net)
> 
> personal website: http://www.public.asu.edu/~cmbarton 
> 
> 
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