[GRASS5] do polylines share endpoints?

[Radim Blazek]

On Monday 26 April 2004 17:08, Christopher Fonnesbeck wrote:
> I am trying to use v.select on a stream layer to select all stream
> segments connected to a chosen segment, first using v.extract:
>
> v.extract list=96 input=streams output=foo
>
> then using v.select with "foo":
>
> v.select ainput=streams binput=foo output=bar
>
> This works fine for most segments, but many segments that are clearly
> attached to other segments are considered by v.select to be unattached.
> For example, in the screen shot I have attached to this message, the red
> line shows the layer "bar" which by the method above should be that
> segment *plus* the 2 segments to which it is clearly connected. Shouldnt
> these three segments share an endpoint? If not, how is one supposed to
> select neighbours?

Check it in v.digit (Settings -> Symbology: node (1 line), node (2 lines) )
If lines are not connected use v.clean tool=snap,break.

Radim