[GRASS-user] r.stream.extract Montgomery

[Jarek Jasiewicz]

stephen sefick pisze:
> I would like to use the Montgomery method to extract streams (exp~2
> from the paper).  What should the threshold value be?  And in general
> what should the threshold value be?  I am working in the southeastern
> coastal plain (USA), which is characterized by low gradient (if this
> helps). 
for flat areas Montgomery's method is not a good option. Generally that 
method was created and tested on areas with gradient > 5%.
>  I am using 1m resolution LIDAR data.  I would like to extract
> the most realistic map of streams that I can. 
Chmmm... what you mean realistic? Maybe use existing stream network will 
be the best solution?
For coastal plains where is no real vallyes the r.watershed's treeshold 
with -b option seems to be best option
>  I am also trying to
> track down the inttermitance perminance threshold.  Any guidance would
> be greatly appreciated.
> kindest regards,
>
>