[GRASS-user] Snapping river segments

[Jarek Jasiewicz]

� 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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>> > 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