[GRASSLIST:8015] Re: dead lines?

[Radim Blazek]

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