[GRASS-user] Generating categorical int values from a string attribute for use with v.to.rast

[Markus Metz]

On Fri, Nov 16, 2018 at 7:30 AM Helmut Kudrnovsky <hellik at web.de> wrote:
>
> >Thank you for your reply. There are many potential categories and
> >thousands of polygons, do you have insight on how to assign int values
> >on-the-fly using v.db.update? Hard coding all potential values would be
> >cumbersome in this application. :)
>
> have you read the manual?:
>
> https://grass.osgeo.org/grass76/manuals/v.db.update.html
>
> where=sql_query
>     WHERE conditions of SQL statement without
>
> looping through your categories in sm_soil_se by a where clause and
> v.db.update the sm_soil_se_int column accordingly?

You could also use v.reclass, e.g.

v.reclass input=soils column=sm_soil_se output=soils_reclass

all areas with the same string value in "sm_soil_se" will get the same
category value.

Markus M
>
>
>
> -----
> best regards
> Helmut
> --
> Sent from: http://osgeo-org.1560.x6.nabble.com/Grass-Users-f3884509.html
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