QGIS » QGIS Application

On 19/10/2014
Paolo Cavallini Reported this bug in qgis developer mailing list

From 19/10/2014 to 20/10/2014
Both Paolo Cavallini and Andre Joos
Were not sure wether it is really a "bug"

From 06/05/2015 to 21/05/2015
JackAttack did some testing (user side, not seeing the code)

It seems that the v.generalize output projection is defined in raw parameters (text or well-known text) and not with the EPSG code.
It seems that qgis (or another tool) interprets the text then assigns guess Proj4 code.
Whit most used SCR WGS 84, EPSG:4326 the guess was in one case USER:100007.
With legal SCR here, EPSG:2154 the guess is an ArcGis code ESRI:102110,
so I think we can't incriminate USER modification or mistake, but the tool.

*SCR = coordinate projection system
*With two different codes, the SCR may be defined the same, but transform parameters may differ.

I suggest that the v.generalize tool sticks with the input SCR, like other tools do.

Alternatively ("low-cost"), I suggest remembering the input SCR in a variable, then the v.generalize tool could end with a transformation of the output into the input.
Thank you for reading.