[Qgis-user] How to change raster values from another raster

[Nicolas Cadieux]

Hi,
If your raster are mutually exclusive (that is nodata value have data in the other raster) your could use gdal_merge found in processing. 
Nicolas

> Le 10 avr. 2019 à 07:01, Wouter Impens <wouter.impens at gmail.com> a écrit :
> 
> Hi Vivien, 
> 
> The tool ''r.patch'' should do the trick. More info on https://grass.osgeo.org/grass76/manuals/r.patch.html
> 
> Greetings
> Wouter
> 
> 
> Op wo 10 apr. 2019 om 11:55 schreef vivien.mai at hotmail.fr <vivien.mai at hotmail.fr>:
>> Hello everyone,
>> 
>> I'm going to introduce myself quickly. I'm a french researcher in Geology
>> and I use a lot Qgis for my work. I don't know if it's the good forum to ask
>> for support on Qgis so tell me if another forum is more appropriate.
>> 
>> I have a DEM with a dame lake in the middle. I need to have the topography
>> under the lake level so I built another DEM with the topography under the
>> lake level. This new DEM has the same projection than the first one but not
>> the same resolution. 
>> 
>> I want to change the elevation values of the fist DEM  using the values of
>> the new DEM. I have already drawn a polygone of the area where I want change
>> the values (the lake).
>> 
>> How can I do this? Can I use a raster calculator?
>> 
>> Thank you in advance for your answers.
>> 
>> 
>> Vivien
>> 
>> 
>> 
>> --
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