[GRASS-user] R: [GRASS-dev] Problems in adding tables to a map

[Aldo Clerici]

Dear Martin and Moritz,
thanks for the helpful explanations.

So a layer is a set of integer numerical value (categories) assigned to
objects in a vector geometry file that can be used to assign to the objects
the attributes that have the same category numbers in a connected table.

So, if I need to assign different attributes to the objects in the vector
file I need to assign new categories to the objects and store them in a new
layer to be connected to a different table.
But how can I add a new layer to a vector?
v.category seems to produce a new vector map with new category values but
doesn't add a new layer in the input map.
The only way I know and I used some times ago, is through  v.db.addtable
that allow to create an empty new table connected to an existing vector and
to define the pertaining new layer. Then I enter v.digit and assign new
category values to the objects in the map through the new layer and fill the
new table with other attributes.
But I suppose there is another simpler way to add and fill a new layer as,
for example, to reclass the category numbers of a map and put the reclassed
categories in a new layer to be connected to a new table with new
attributes. Or not?

Aldo Clerici



-----Messaggio originale-----
Da: Martin Landa [mailto:landa.martin at gmail.com] 
Inviato: mercoledì 21 novembre 2012 15:55
A: Moritz Lennert
Cc: grass-user at lists.osgeo.org; Aldo Clerici; GRASS developers list
Oggetto: Re: [GRASS-dev] [GRASS-user] Problems in adding tables to a map

Hi,

> 2012/11/21 Moritz Lennert <mlennert at club.worldonline.be>:
> Already exists in grass7: option=transfer

ops, I was accidentally checking 6.5. Too many versions installed ;-) Thanks
for the correction.

Martin

--
Martin Landa <landa.martin gmail.com> * http://geo.fsv.cvut.cz/~landa