The input has to be the *flow direction* raster that is created by
r.watershed.
From the manpage (as Helmut suggested):
- direction
- Flow direction: name of input direction map produced by r.watershed
or
r.stream.extract. If r.stream.extract output map is
used, it only has non-NULL
values in places where streams occur. NULL (nodata) cells are
ignored, zero and
negative values are valid direction data if they vary from -8 to
8 (CCW from
East in steps of 45 degrees). Direction map shall be of type
CELL values. Region
resolution and map resolution must be the same.
It's best to keep these questions on the maillist.
On 2017-12-25 14:44 PM, Shane Carey
wrote:
Sorry to bothering you again Micha, just one last question!
When I run it, I get back raster dcell maps for gradient for
the entire area and not just the streams. I presume I have to
use the river network I previously created to extract the
values at the streams.
Thanks
--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
+972-523-665918
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