[GRASS-user] Calculating Length Between Points On Stream Network

[Jarek Jasiewicz]

Rich Shepard pisze:
>   I have a vector map of a stream network and want to find the distance
> between two points on the main stem. I have the geographic coordinates of
> each point on the line representing the stream. I tried v.what but I'm 
> not
> comfortable that gave me the correct answer.
>
>   The line between the two points is multiple segments where there are
> confluences with feeder streams.
>
>   What module, used with the GUI or on the command line, will allow me to
> calculate the distance along the stream between two identified points?
>
> Rich
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try to use r.stream.pos but it work only with raster map
J.