My guess is that the issue is related to this one:
https://trac.osgeo.org/grass/ticket/3048
(GRASS does not write AUTHORITY parameter (the EPSG code) to GeoTIFFs, thus 
QGIS makes a guess where it takes the first matching CRS (the ID number of the 
assigned EPSG code is lower than the original), I presume...).

I will update https://hub.qgis.org/issues/11884 and 
https://hub.qgis.org/issues/14499 accordingly...

Cheers
Stefan
 

-----Original Message-----
From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Paolo 
Cavallini
Sent: 29. september 2016 07:47
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] GRASS processing algorithms outputs different CRS

Il 29/09/2016 01:12, Nikos Alexandris ha scritto:
> Stephane Goldstein:

>> I mostly work with shapefiles in the EPSG 4283 CRS.
>> Every time I run them through a GRASS processing algorithm, the 
>> output is in EPSG 4019 (Unknown datum based upon the GRS 1980 
>> ellipsoid)
> 
> I think this is related to the (QGIS) project's coordinate reference 
> system settings.  Could you, please, check and confirm?
> 
> Best, Nikos
> 
>> I know that in practical terms there is no difference, as both CRSs 
>> have the same definition (+proj=longlat +ellps=GRS80 +no_defs), but I 
>> often find myself editing .prj files to keep consistency.
>>
>> Why can't GRASS algorithms recognise EPSG 4823 and write shapefiles 
>> in the same CRS ?
>> Is there any way to fix this ?

Hi Nikos,
this is a known and long standing issue. Please search the relative ticket and 
see if you can add further details. It would be very useful if you could 
support its solution.
All the best.

--
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html
https://www.google.com/trends/explore?date=all&geo=IT&q=qgis,arcgis
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