[GRASS-user] Elevation above a river

[Shane Carey]

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 <
johannesradinger at 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 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*
>>> _______________________________________________
>>> grass-user mailing list
>>> grass-user at lists.osgeo.org
>>> https://lists.osgeo.org/mailman/listinfo/grass-user
>>
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>
> --
Le gach dea ghui,
*Shane Carey*
*GIS and Data Solutions Consultant*
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