[GRASS-user] Snapping river segments
jarekj at amu.edu.pl
Thu Mar 22 15:26:42 EDT 2007
> 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?
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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>> grassuser at grass.itc.it
well problem is on
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