[GRASS-user] Elevation above a river

[Johannes Radinger]

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 river channel from the original elevation map.
/Johannes

On Sun, Sep 16, 2018 at 5:16 PM Markus Neteler <neteler at osgeo.org> wrote:

> Hi,
>
> Shane Carey <careyshan at gmail.com> 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 calculate heights of 1m and 3m above a river channel on both
>> sides of the channel and create a polygon from it.
>>
>
> This isn't clear to me. Could you elaborate?
>
> Best
> Markus
>
>
> Thanks all.
>>
>> Le gach dea ghui,
>> *Shane Carey*
>> *GIS and Data Solutions Consultant*
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