[GRASS-user] Stream order from existing stream network layer

[Stefan Blumentrath]

Hi Shane,

If your network dataset is directed, you could use:
https://github.com/NINAnor/gudbrand_hydro/blob/master/v.igraph.order.py
to classify the nodes from which you then can generate the outlet vector point map for v.stream.order.

If your network is not directed, you could use v.to.points or v.net to dump the points, add altitude information from a terrain model (v.what.rast), and then extract the lowest points as outlets (requires some SQL).

For more support we would need a bit more information about your data…

Cheers
Stefan


From: Shane Carey <careyshan at gmail.com>
Sent: tirsdag 1. mai 2018 10.29
To: Stefan Blumentrath <Stefan.Blumentrath at nina.no>
Subject: Re: [GRASS-user] Stream order from existing stream network layer

Hi Stefan,
I had a look at this, but it requires a point layer also - which I don't have unfortunately.
Thanks

Le gach dea ghui,
Shane Carey
GIS and Data Solutions Consultant

On Tue, May 1, 2018 at 7:57 AM, Stefan Blumentrath <Stefan.Blumentrath at nina.no<mailto:Stefan.Blumentrath at nina.no>> wrote:
Hi Shane,

Please have a look at:
https://grass.osgeo.org/grass74/manuals/addons/v.stream.order.html
Then you can use v.rast.stats to collect some statistics…

Cheers
Stefan

From: grass-user <grass-user-bounces at lists.osgeo.org<mailto:grass-user-bounces at lists.osgeo.org>> On Behalf Of Shane Carey
Sent: tirsdag 1. mai 2018 00.37
To: grass-user grass-user <grass-user at lists.osgeo.org<mailto:grass-user at lists.osgeo.org>>
Subject: [GRASS-user] Stream order from existing stream network layer

Hi,
Is there way of calculating the stream order from an existing vector dataset in Grass GIS? The vector layer has been created from manual digitising.
In addition, is it possible to obtain other stream characteristics for this layer that you would obtain from "r.stream.segment"
Thanks in advance

Le gach dea ghui,
Shane Carey
GIS and Data Solutions Consultant

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