[GRASS-user] Re: Add DB entries to vector line (after v.split)

[Alexander Muriy]

Hi, wittich.

-- firstly you should delete old categories from your segments' lines (they
relate to the initial 3 lines):
 v.category in=lines_split out=lines_split_nocats opt=del

-- then add new cats to segmented lines:
v.category in=lines_split_nocats out=lines_split_newcats opt=add


*As a promotion*: there is a small shell-script
<v.to.equidist<http://grass.osgeo.org/wiki/Addons#v.to.equidist>>
on GRASS-Addons page that generates vector points or line segments along a
given vector line(s) with the equal distances (uses v.segment) and populate
tables with cats, length etc.



Date: Sun, 23 Oct 2011 10:26:06 -0700 (PDT)
> From: wittich <vwittich at gmail.com>
> Subject: [GRASS-user] Add DB entries to vector line (after v.split)
> To: grass-user at lists.osgeo.org
> Message-ID: <1319390766722-6922423.post at n2.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
> Hi there,
>
> I try to find a way to give every line segment in my vector file a db
> entry.
> I've create 3 lines and split them into 50m segments. Now I want to do
> several calculations with it. Therefore I need for each segment a row in
> the
> db.
>
> *How can I create a entry for each segment?*
>
> > v.info split_lines
> > Number of lines: 598
>
> > v.db.select split_lines
> > cat
> > 1
> > 2
> > 3
>
> I would appreciate if someone can explain me what I do wrong, I tried
> already everything I could found without success (eg. v.dissolve,
> v.category, v.centroids, and others)
>
> regards Valentin
>
> --
> View this message in context:
> http://osgeo-org.1803224.n2.nabble.com/Add-DB-entries-to-vector-line-after-v-split-tp6922423p6922423.html
> Sent from the Grass - Users mailing list archive at Nabble.com.
>
>
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