[GRASSLIST:8017] Re: dead lines?

M S mseibel at gmail.com
Mon Aug 22 07:26:30 EDT 2005

so is there a way to "restore/ressurect" those lines that are dead? 
if they are deleted can you have the software restore them if u made a
mistake when deleting them?


On 8/22/05, Radim Blazek <radim.blazek at gmail.com> wrote:
> On 8/18/05, M S <mseibel at gmail.com> wrote:
> > I read that v.clean "removes dead lines from your map.  Dead lines are
> > vectors that have been marked for deleted in v.digit."
> >
> > I'm confused about these dead lines.  In v.digit (using grass 6.0) i
> > delete lines and they go away, and then i get prompted to remove the
> > associated record from the database.
> >
> > Are these lines really deleted at this point?
> >
> > It sounds like they are not removed until v.clean is run.  if this is
> > the case, can these lines be restored PRIOR to running v.clean?
> >
> > Can someone rephrase  what v.clean does and what "dead lines" are?
> >
> > thanks!
> If you delete a line in v.digit, it is only marked in the file as 'dead' but
> it remains there and occupies space. If you run any module which
> realy reads and writes lines (not g.copy) it writes only lines which
> are 'alive'.
> Usually you don't need to think about dead lines.
> Radim

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