[GRASS-user] creating new geometry from pre-existing lines and points

[Nikos Alexandris]

On Wed, 2008-01-30 at 19:32 +0200, David Epstein wrote:
> Hi everyone,
> 
> First--I want to thank everyone on this list. I've installed a lot of
> new tools in the last month (including a new OS, ubuntu) and got up and
> running very fast because of help received here. Thank you again!
> 
> Second--another question (of course). I have a vector (polygon) layer
> and there is a hole (no surface). I want to turn that hole into a
> polygon using the existing lines and points around it. I thought I could
> use v.digit for this but I did a very poor job. Perhaps there is a
> particular v.digit technique or another tool I should use?

I didn't tried it yet... (cause I need the islands in my work
currently!) but here is a "copy-paste" from the v.extract man page:

 Remove islands from polygon map

       v.extract in=map_with_islands out=maps_without_islands
list=1-99999
       # and/or
       v.extract -d in=map_with_islands out=maps_without_islands

> 
> Also (and this relates to a previous question of mine) if I have
> imported a postGIS vector layer via v.in.ogr, does that create a
> permanent link so that edits via v.digit are then written back to the
> SQL database? Or do I need to somehow tell it to update?
> 
> thank you again,
> -david
> 
> 
> 
> 
> 
> 
> 
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-- 
Nikos Alexandris
.
Department of Remote Sensing & Landscape Information Systems
Faculty of Forestry & Environmental Sciences, Albert-Ludwigs-University Freiburg
.
Tel.  +49 (0) 761 203 3697 / Fax.  +49 (0) 761 203 3701 / Skype: Nikos.Alexandris
.
Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany
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