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

[Markus Metz]

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
>
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