[GRASS-user] Snapping river segments

[Carlos "Guâno" Grohmann]

What if you convert the vector to raster, then back to vector? each
stream should be one segment.




On 3/22/07, Jarek Jasiewicz <jarekj at amu.edu.pl> wrote:
> � napisał(a):
> > Perhaps v.to.db to add the length of each segment to the database, and
> > then v.extract? or SQL thru gis.m to create a new map?
> >
> > Carlos
> it is not a good solution there are no rules on segment lenght in river
> network (there can be short segement in main stream and longer  in
> tributaries and opposite)
> >
> >
> >
> > On 3/22/07, Colin Nielsen <colin.nielsen at mail.mcgill.ca> wrote:
> >> With over to 10,000 river segments that isn't exactly a practical
> >> solution for me. Anything else?
> >>
> >> On 3/22/07, Jarek Jasiewicz <jarekj at amu.edu.pl> wrote:
> >> > Colin Nielsen napisa�(a):
> >> > > I'm trying to extract only the largest rivers from a very detailed
> >> > > hydrology map (mostly for display purposes). Right now the map just
> >> > > looks black with lines. I've managed to use v.extract for areas but
> >> > > since the rivers are in segments i can't use v.extract for lengths.
> >> > > I've tried v.clean snap but it doesn't seem to be doing what I
> >> want it
> >> > > to. Any advice?
> >> > >
> >> > > -Colin
> >> > >
> >> > > _______________________________________________
> >> > > grassuser mailing list
> >> > > grassuser at grass.itc.it
> >> > > http://grass.itc.it/mailman/listinfo/grassuser
> >> > for now (with my previous experiences with exactly the same problem)
> >> > v.digit seems to be the fastest solution :(
> >> >
> >>
> >> _______________________________________________
> >> grassuser mailing list
> >> grassuser at grass.itc.it
> >> http://grass.itc.it/mailman/listinfo/grassuser
> >>
> >
> >
> well problem is on
>


-- 
+-----------------------------------------------------------+
              Carlos Henrique Grohmann - Guano
  Geologist M.Sc  - Doctorate Student at IGc-USP - Brazil
Linux User #89721  - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
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