> 
> 
> Need some help please,
> 
>      I have several VERY large vector files composed of "patched" elevation
> files that have been modified to the point that there are a large number of
> dead lines in them. I used v.clean on them but got an out of memory error
> message. This brings me to the question. I know the files are in the dig_att
> portion of GRASS, but how can I distinguish a dead line from a line that is
> supposed to remain. That is, what is the marker or lack of marker that
> identifies the dead line from a active line? I am planning on using a UNIX
> command to remove the offending lines and then running v.support to remake the
> topology.
>
 
Elevation files supposedly only have lines, no areas, so it's easy enough 
to get rid of the attributes in the dig_att file: they're preceeded by a 
'l' instead of a 'L'. The description of the vectorline itself 
is not explicitly stored in ASCII, but if you use v.out.ascii you can 
modify the resulting dig_ascii file, where the dead lines are 
represented by 'l' instead of 'L'. By the way, did you run v.support 
BEFORE v.clean?

> Thanks in advance... > > Chris D Garvin: Ft Sill, OKLAHOMA 
> > 

Philip Verhagen
-- 


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