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

[Shane Carey]

Super - thank you! I will give this a go first and get back to you if I get
stuck. Thanks again.

Cheers

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

On Tue, May 1, 2018 at 12:01 PM, Stefan Blumentrath <
Stefan.Blumentrath at nina.no> wrote:

> 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> 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> *On Behalf Of *Shane
> Carey
> *Sent:* tirsdag 1. mai 2018 00.37
> *To:* grass-user grass-user <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*
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/grass-user/attachments/20180501/ec239b84/attachment.html>