[GRASS-user] stream network extraction

[achim]

Hi Markus,

That is what was missing in stream-network analyzes!

Great to have this! I didnt have a deeper look yet, but I will test and
probably enjoy the script (in fast C-code).

Thank you for that!
Achim



Markus Metz schrieb:
> Hi all,
> 
> in grass-addons is a new module for clean stream network extraction from
> flow accumulation. It can extract streams from accumulation maps
> generated with any method (D8, FD8, D-Inf, DEMON, etc) and any software,
> granted that exactly the same elevation map is provided that was used to
> calculate flow accumulation. In case of r.terraflow, that would be the
> flooded (filled) output elevation map, not the elevation map used as
> input for r.terraflow. For e.g. TAS flow accumulation as input, it must
> be the elevation map used within TAS to calculate flow accumulation.
> 
> r.stream.extract output is available as raster and vector with unique
> stream IDs. The vector is a complete network with stream segments and
> points for stream heads, confluences and outlets. The raster output can
> be used as input for the r.stream.* modules of Jarek, also in grass-addons.
> 
> Regards,
> 
> Markus M
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