[GRASS-user] features not reachable in network

GRASS GRASS user
1

Hi all,

I’m trying to measure the distance between points along a vector representing a stream network. I tried this first with the ‘stream’ vector in the North Carolina sample data set, following the example from the documentation for v.net.allpairs:

  1. v.split to split network into segments of a specified length
  2. v.net option=nodes to generate network with points at end of segments
  3. v.net.allpairs to calculate distance between all pairs of points

This worked fine.

Then I tried this with some new vector data representing a stream that was created with r.stream.extract. When I ran the v.net.allpairs, I only receive distances between certain points on the network. Running v.net.distance returns a message, “WARNING: 232 ‘from’ features were not reachable”.

I tried running the snap tool in v.clean to correct topological issues with the data, but I’m still getting the same error message.

Does anyone have thoughts on what else I can do to try to resolve this?

Thanks,

Will