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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