[GRASS-user] HydroFlow: Stream order soleley based on shape files/vectors

[Johannes Radinger]

1) Concerning the flow direction / network direction

So far what I can understand from the html-manual, the only two
input data is the map with the river network and a line or polygon file
the defines the catchement. The flow direction within the network
is then defined by the outflow point which is the only line of the river
that touches or intersects with the catchment border. Unfortunately,
neither I am a native Brasilian (which makes reading the manual difficult)
nor
I am able to read or understand the source code behind the model

2) Concerning the license
It is licensed under GNU GPL:
http://www.fgel.uerj.br/labgis/hydroflow/Help/helphydroflow.html?{D3EB24A2-0B1B-4CA1-B0C6-F05855A23C8D}.htm

@Madi: No unfortunately I haven't tried HydroFlow yet. I first have to
figure out how to compile it using qmake on my ubuntu machine. Concerning
v.strahler: AFAIK also this module needs a DEM to identify flow direction,
which is often not available when you have only the river vector. And of
course HydroFlow also provides other measures of stream order beside
Strahler...

I hopefully get the tool installed quite soon. I will then report how well
it is working.

/Johannes


On Tue, Jun 18, 2013 at 3:08 PM, Markus Metz
<markus.metz.giswork at gmail.com>wrote:

> On Tue, Jun 18, 2013 at 1:52 PM, Johannes Radinger
> <johannesradinger at gmail.com> wrote:
> > Hi,
> >
> > I found following interesting Brasilian program called HydroFlow:
> > http://www.fgel.uerj.br/labgis/hydroflow/en/downloads_ingles.html
> >
> > This tools calculates the Stream order (e.g. Strahler, Shreve)
> > based on a shapefile input of the river network and a shapefile that
> defines
> > the border (catchment?). If I am informed correctly such a tool that does
> > not require any form of a DEM (or accumulation map etc.) is not existing
> for
> > GRASS yet.
>
> One bit of requirement information must be provided in addition to the
> shapefile: the outlet of a river network. If the lines of the
> shapefile follow drainage dirction, this is possible, because then per
> network only one line will go towards an end point. You could look at
> the description or source code if possible to find out how HydroFlow
> identifies the outlet of a river network.
>
> Markus M
>
>
> >
> > There are just two questions that appeared to me:
> >
> > 1) Has anyone installed and tried the programm already in Ubuntu/Linux?
> >
> > 2) The tool is licensed as open source. So, could such a algorithm also
> be
> > implemented as
> > a add-on to GRASS? I am not sure but I can imagine that this might be of
> > interest also to
> > other GRASS users!?
> >
> > /johannes
> >
> > _______________________________________________
> > grass-user mailing list
> > grass-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/grass-user
> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/grass-user/attachments/20130618/3391645b/attachment-0001.html>