[GRASS-user] Calculating Azimuth of Stream Main Channel

[Markus Neteler]

On Wed, Nov 7, 2012 at 11:39 PM, Rich Shepard <rshepard at appl-ecosys.com> wrote:
>   I need the compass direction (azimuth) of the main channels in identified
> sub-basins delineated by r.basin. I've looked at the list of vector and
> raster modules (both regular and add-on) without seeing one that will
> provide this output.
>
>   Is there a module that can take a basin's mainchannel map and identify the
> compass direction in which it flows?

You may want to check:
http://grass.osgeo.org/gdp/html_grass64/m.cogo.html

and
http://grass.osgeo.org/gdp/html_grass64/v.to.db.html
 option=azimuth: line azimuth, calculated as angle between North
direction and endnode direction at startnode

Markus