[GRASS-user] Snapping river segments

[Jarek Jasiewicz]

� napisał(a):
> What if you convert the vector to raster, then back to vector? each
> stream should be one segment.
>
no, there be much more addational segments. Wrong way. (about twice, as 
I tried few seconds before)
>
>
>
> 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
>> >> > >
>> >> > > _______________________________________________
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>> >> > > 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 :(
>> >> >
>> >>
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>> >>
>> >
>> >
>> well problem is on
>>
>
>