[Qgis-user] how does QGIS generate the EPSG from a Shapefile?

[Andre Joost]

Am 25.10.18 um 16:00 schrieb ralfwessels:
> Hi Rodrigo,
>
> Only if the shapefiles contain a prj-file (with the right informations about
> the coordinate system) QGIS opens it automatically correct.
>

Not necessarily with the correct EPSG code. If there are several EPSG 
codes with (almost) similar parameters, QGIS takes the first it finds.

Especially EPSG:3857 is a candidate for false detection.

If the shapefile was created with QGIS, it has a .qpj file with the EPSG 
code number stored inside. If the shapefile was created with some other 
software, QGIS has to guess.

Greetings,
andre Joost