[GRASS-user] Merge spatially connected features

[Johannes Radinger]

Hi all,
I have a large river network dataset (lines). Now I'd to assign unique
categories to each group of connected lines that have an attribute in
common.

For example, my rivers are categorized based on some kind of stream order.
I want to group all rivers that belong to stream order 2 and are spatially
connected; each group should get a unique category value. I thought that I
could first extract all rivers with a particular attribute (e.g. stream
order = 2) which will provide me some scattered pattern of lines. Then I
need a spatial join tool to make subgroups of lines that are connected. How
can I achieve the latter? Any idea?

Cheers,
Johannes
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/grass-user/attachments/20200224/0628fc4b/attachment.html>