v.fixed.segmentpoints is just a wrapper script of v.Segment

http://grass.osgeo.org/grass71/manuals/v.segment.html

v.segment is very flexible.

you have to define rules (e.g. lines with different cats). IMHO it's the way
to go if the river segments have different cats.

in v.fixed.segmentpoints I've implemented that the attribute table contains
the distance from source, but that's not implemented in v.segment.



-----
best regards
Helmut
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