[GRASS-user] stream network extraction

[Markus Metz]

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