Hi Shane,
On Fri, Sep 14, 2018 at 5:03 PM Shane Carey wrote:
>
> Does anyone know is it possible to calculate the elevation above a river
> channel (actual river network that was digitised as opposed to being
> extracted from a DTM) from a DTM and create a polygon from it.
>
> I need to
That is were the third step should follow, i.e. using r.mapcalc to identify
all the cells that are 1m higher than the grown river (irrespective in
which distance from the river these cells are located). The rasterized area
could then be translated into a vector format using r.to.vect.
Here a
Hey Johannes,
Thanks for your reply. How does r.grow work if let's say the height above
the river reaches 1m at 3meters away from the river. And in an other area
it reaches the 1meter height at 2meters away from the river. Is it able to
follow that line?
Thanks
On Domh 16 MFómh 2018 at 17:21,
Cool thanks. I think this might work.
Cheers for this - really great idea and help!!
On Domh 16 MFómh 2018 at 17:21, Johannes Radinger <
johannesradin...@gmail.com> wrote:
> To me this looks like a flooding-related question, i.e. to extract the
> shore lines of a river if it's water level is
Hi,
I'm not sure I made myself clear. I have a "real" river vector dataset of
an area.
It includes artificial channels also.
This dataset was digitised manually and does not match the extracted river
dataset from DTM algorithms in grass (r.stream.extraxt)
I need to use the real river vector
To me this looks like a flooding-related question, i.e. to extract the
shore lines of a river if it's water level is raised by 1m or 3m?
Maybe (1) extract the raster cells of the elevation map that represents the
river channel, (2) then apply r.grow and (3) then r.mapcalc to subtract the
grown
Hi,
Shane Carey schrieb am Fr., 14. Sep. 2018, 23:02:
> Hi All,
>
> Does anyone know is it possible to calculate the elevation above a river
> channel (actual river network that was digitised as opposed to being
> extracted from a DTM) from a DTM and create a polygon from it.
>
> I need to
