[Qgis-user] Correcting river flow

[Alessandro Pasotti]

How about iterating over the lines, read z from the raster for start and
end point and compare them?

No grass required.


On Sat, Apr 13, 2019, 22:31 Nicolas Cadieux <nicolas.cadieux at archeotec.ca>
wrote:

> Hi,
>
> I have a difficult problem.  I have a very large river network file made
> with a 2D shapefile.  (I have the SRTMs for the same region).  I would
> like to model a river network but I need to keep in mind the river flow
> direction.  Unfortunately, I think this file was manually digitized and
> therefore, line directions have no relationship with river flow direction.
>
> Can anyone suggest a way to use my SRTMs to change the line directions
> or to add a flow direction variable without resorting to manually
> editing the layer?
>
> Thanks,
>
> Nicolas
>
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